Silkworm Farming 101: A Keeper's Guide to Raising the Perfect Soft-Bodied Feeder

Silkworms are the feeder I reach for when an animal needs something gentle — soft-bodied, full of moisture, packed with calcium, and almost impossible for a reptile to choke on or struggle to digest. They're the feeder I push on picky eaters, on gravid females that need calcium, on animals coming off an illness, and on anyone keeping a chameleon (chameleons go genuinely silly for them). They don't bite, they don't climb, they don't burrow, and they can't infest your house. In a lot of ways they're the easiest feeder to keep alive — right up until they're not, because silkworms punish bad hygiene faster and harder than any feeder I keep.

The original of this guide was written as a how-to for commercial silk production — reeling cocoons, selling thread, scaling a sericulture business. That's a beautiful old craft, but it's not why you and I keep these worms. We keep them to grow clean, nutritious feeders for our reptiles and amphibians, and that completely changes the playbook: we never want a cocoon, we feed the worms off before they spin, and our entire job is keeping a batch of soft, disease-prone larvae alive and growing until they hit feeding size. So this is that guide — silkworm keeping rewritten end to end for the feeder keeper.

I'll cover what silkworms actually are, why they're worth the trouble, the full life cycle (and which parts you'll never see), the two ways to keep them, the enclosure, temperature and the all-important humidity-and-hygiene problem, mulberry versus chow and how to prepare it, hatching eggs from scratch, what each instar needs, the diseases that wipe colonies out and how to dodge them, storage, feeding off by animal, where silkworms sit nutritionally against the other feeders, and a troubleshooting section for when a tub starts dying. Read it once, set up clean, and silkworms become one of the most rewarding feeders you'll ever raise.

What silkworms actually are

The silkworm is Bombyx mori, the larva (caterpillar) of the domestic silk moth. It is not a worm at all — it's the immature stage of a moth, the same way a hornworm is a moth larva. Humans have bred Bombyx mori for thousands of years, and the result is one of the most thoroughly domesticated animals on earth: it cannot survive in the wild, the adult moth has lost the ability to fly, and the larvae will sit in an open tub of food rather than wander off. Everything that makes them a nuisance-free feeder is a side effect of that domestication.

In nature, silkworm larvae are obligate mulberry feeders — they eat the leaves of the mulberry tree (genus Morus) and essentially nothing else. That single dietary fact drives almost every decision in this guide. You cannot gut-load a silkworm on carrots and greens the way you can a roach or a cricket; what goes in is mulberry, full stop. The good news is that the nutrition is already in the mulberry, so a well-fed silkworm is a nutritious feeder without any clever loading on your part.

The larva goes through complete metamorphosis — egg, larva, pupa (inside a cocoon), adult moth — unlike roaches and crickets, which skip the cocoon stage. As a feeder keeper you care almost entirely about the larval stage, because that's the part your animals eat. A freshly hatched silkworm is a dark, hairy speck about 2–3 mm long. A fully grown one, five weeks later, is a plump, pale, finger-thick caterpillar around three inches long and several grams heavy. That growth — from pinhead to three inches in about a month — is enormous, and it's why feeding and hygiene have to scale aggressively as a batch matures.

Why silkworms are worth keeping

A few traits make silkworms a feeder I keep on hand even though they're fussier than roaches:

• ◆They're soft and low-chitin. A silkworm is almost all moist body and almost no hard shell. That makes them extremely easy to digest and a safe choice for animals where impaction or hard exoskeletons are a worry — juveniles, small geckos, recovering animals.
• ◆They're high in moisture and calcium. Silkworms run around 80% water, so they hydrate as they feed, and they carry more calcium than most common feeders — genuinely useful for gravid females and growing animals (more on the numbers later, with honest caveats).
• ◆They're very low in fat. Unlike superworms and waxworms, silkworms won't fatten an animal up. You can feed them generously without the obesity and fatty-liver worries that come with the rich feeders.
• ◆They're completely safe to leave loose in an enclosure. They can't climb smooth walls, they move slowly, they don't burrow, and they don't bite. Drop a few in and they'll sit there until eaten — no chewing on a sleeping gecko the way a loose cricket will.
• ◆They can't infest or escape into your home. Because Bombyx mori is helpless without human care, an escaped worm is a dead worm, not a breeding population in your walls.

The honest trade-off: silkworms are delicate. They are notoriously susceptible to bacterial, viral, and fungal disease, they need clean food kept at the right moisture, and a careless tub can crash from a hundred healthy worms to a hundred dead ones in a couple of days. They also can't be stored cold the way superworms can, so you're managing a living, growing batch on a clock. Solve the hygiene problem — which this guide is largely about — and everything else is easy.

For a tougher, set-and-forget colony feeder that lives at room temperature and breeds itself, see my companion guide on how to keep discoid roaches alive. Silkworms and a roach colony complement each other perfectly: the roaches are your durable staple, the silkworms your premium soft feeder.

The silkworm life cycle (and the parts you'll never see)

Understanding the full cycle tells you exactly where the feeder window is and what to skip.

Egg stage

The cycle starts as a tiny egg — oval, pinhead-sized, gray to yellowish. At a steady 77–86°F (25–30°C) with moderate humidity, eggs hatch in roughly 7–14 days. Eggs are also where the storage trick lives: kept cold, silkworm eggs go into stasis and hold for weeks to months, which lets you time a hatch to when you'll actually need feeders. We'll come back to that in the hatching and storage sections.

Larval stage — this is the feeder

This is the part that matters. Newly hatched larvae are dark and minuscule and need food immediately — finely shredded tender mulberry or fresh chow within hours. Over the next 24–35 days they eat almost continuously and molt four times, passing through five instars (the stages between molts). With each molt they get dramatically bigger and hungrier. By the fifth and final instar they reach their full size — about 3 inches (7–9 cm) and several grams — and their appetite peaks. This entire larval stage is your feeding window. Anytime from second instar onward you can feed worms off at whatever size suits your animals.

Around each molt the worm stops eating, rears its head up, and goes still for a day or so while it sheds. A molting worm looks half-dead and dull — don't panic and don't disturb it. We just don't feed heavily during molts.

Pupal stage (cocoon) — skip it

When a fifth-instar worm is done growing, it stops eating, empties its gut, takes on a slightly translucent amber tone, and starts wandering and waving its head looking for a place to spin. Over 2–4 days it wraps itself in a continuous silk filament — the cocoon — and pupates inside. For a silk farmer this is the whole point. For a feeder keeper it's the end of the line: a worm that spins is a worm you can no longer feed off, and a tub full of cocoons is a tub of feeders you missed. The practical lesson is to feed worms off, or deliberately let only a few spin if you want to breed, before the batch starts cocooning.

Adult moth stage — only if you're breeding

After about 10–14 days in the cocoon, a creamy white moth chews its way out. Adult moths cannot fly and do not eat — they live only a few days, purely to mate and lay eggs. A female lays 300–500 eggs and then dies, and the cycle restarts. You only ever see this stage if you choose to breed your own (covered below); most keepers buy eggs or worms and never let a cocoon form.

Two ways to keep silkworms

There are two completely valid approaches, and choosing the right one for you saves a lot of grief.

1. Buy worms and grow them out. You order a cup of small-to-medium silkworms, keep them clean and fed, and feed them off as they grow. This is the simplest path and what I recommend to anyone starting out. There's no hatching to manage, no chow to perfect for fragile hatchlings, and you get usable feeders right away. The catch is they're on a clock — they'll keep growing toward cocoon size whether you're ready or not.

2. Hatch from eggs. You buy eggs and raise the whole batch from scratch. This is far cheaper per worm, gives you total control over timing (you decide when to start a hatch), and is genuinely satisfying. It's also more work and less forgiving: the first-instar stage is the most disease-prone and demands the cleanest food and conditions. I'd raise a couple of bought batches first, get the hygiene rhythm down, then graduate to eggs.

Either way the husbandry from second instar on is identical. The rest of this guide assumes you want to do it well at any scale, from "feed one leopard gecko" to "supply a whole collection."

The enclosure: clean, ventilated, and shallow

Silkworm housing is refreshingly simple — the difficulty is all in keeping it clean, not in building anything fancy.

Container

Use a shallow, ventilated plastic tub or rearing tray. Shallow matters: silkworms don't climb or stack, so floor space is what counts, not height. Smooth-walled containers are fine — they can't scale them — so you don't even need a tight lid for adults, though a vented lid helps control airflow and keeps stray household pests out. Many keepers raise them right in the deli cup or ventilated "silkworm keeper" tray they arrived in, upgrading to a bigger tray as the worms grow.

The single most important feature is ventilation. Cut or melt generous vent holes and, ideally, cover them with fine mesh. Stagnant, humid air is what kills silkworms; moving air is what keeps them alive. I'd rather have a tub that's a touch too breezy than one that fogs up.

Bedding and floor

Keep it simple: a layer of paper towel or, better for airflow, a plastic mesh screen (the kind that comes in silkworm keeper trays) sitting above a paper towel. The mesh lets frass and old chow fall through, away from the worms, which keeps the living surface cleaner. Do not use coco fiber, soil, or any damp loose substrate — silkworms don't burrow and damp bedding just grows mold and bacteria. Dry, simple, and easy to swap out is the whole philosophy.

Spacing and crowding

Give them room. Crowded silkworms stress, overheat, foul their food faster, and spread disease through the batch in hours. As a rough rule, the worms shouldn't be climbing over each other to reach food. When a tray looks crowded, split the batch across a second tray — splitting is the cheapest insurance you can buy against a crash. Separate noticeably different sizes too; tiny worms get smothered and out-competed by big ones.

Temperature, humidity, and the hygiene problem

This is the section that decides whether your silkworms thrive or rot. With roaches the make-or-break lever is heat. With silkworms it's moisture and cleanliness — and the two are tangled together.

Temperature

Aim for 78–82°F (25–28°C) for healthy, steady growth. Silkworms tolerate a bit either side, but this band is the sweet spot. Warmer pushes them to grow and eat faster (and to cocoon sooner); cooler slows everything down, which you can use on purpose to stretch a batch. Avoid sustained heat much above the mid-80s — it stresses the worms and, just as importantly, it accelerates spoilage of the chow and the growth of the bacteria and fungus that kill them. Keep them out of direct sun and away from heat sources that bake the food. Gentle, stable warmth beats a hot box.

Humidity — and why "tropical" is a trap

You'll read that silkworms want 70–85% humidity, and in a sterile commercial setting that's true. In a home feeder tub, chasing high humidity is how you kill them. High ambient humidity plus a closed container plus moist chow equals condensation, mold, and bacterial blooms — the exact conditions silkworm diseases love. My rule for feeder keeping: err dry and ventilated. The worms get all the moisture they need from their food (chow and fresh mulberry are mostly water). What you're managing is the air, and you want it moving, not muggy.

The practical targets:

• ◆No standing condensation on the lid or walls — if you see fog, wipe it off and add ventilation.
• ◆Firm, not soggy, chow — wet food is the number-one killer.
• ◆Airflow through the container at all times.

Hygiene — the actual job

Silkworms are unusually vulnerable to disease, so hygiene isn't housekeeping, it's husbandry. The non-negotiables:

• ◆Wash your hands before handling worms, food, or the tub. You are the most common vector for the bacteria and viruses that wipe out batches.
• ◆Keep the food fresh. Remove old, drying, or moldy chow and leaves promptly. Spoiled food is where outbreaks start.
• ◆Remove frass (droppings) regularly. It piles up fast as the worms grow and it holds moisture and pathogens. A mesh floor makes this easier; otherwise lift the worms onto fresh food and discard the old bedding.
• ◆Don't crowd, and isolate the sick. The moment you see a worm that's gone limp, dark, swollen, or oozing, remove it — don't wait to see if it recovers. One sick worm can seed the whole tub.
• ◆Disinfect between batches. Wash trays with a mild bleach solution, rinse thoroughly, and dry completely before the next batch.

I clean a healthy silkworm tray every 1–3 days depending on size — far more often than I'd ever touch a roach bin. That frequency is the price of admission for these worms, and it's exactly why so many people "can't keep silkworms alive." They're not hard; they're just unforgiving of a dirty tub.

Food: mulberry vs. chow

Silkworms eat mulberry, and only mulberry. You have two ways to deliver it.

Fresh mulberry leaves

If you have access to a mulberry (Morus) tree, fresh leaves are excellent food and grow worms fast. Offer tender young leaves, finely shredded, to the smallest worms (their mouths can't handle tough mature leaves), and progressively larger pieces as they grow. Rinse leaves to remove dust and — critically — be absolutely certain they're free of pesticides. A single sprayed leaf can wipe out a tray; silkworms are extremely sensitive to insecticide residue, which is part of why they're used as bio-indicators. Store unused leaves wrapped in a slightly damp cloth or bag in the fridge to keep them fresh, and pull any that wilt or slime.

The downside of fresh leaves is seasonality — in most climates the tree is bare for months — and the pesticide risk if you're foraging. Which is why most keepers, including me much of the year, run on chow.

Commercial silkworm chow

Chow is simply dried, powdered mulberry leaf (sometimes with added nutrients) that you reconstitute. It's the single thing that makes silkworms keepable year-round without a tree. The basic preparation:

1. ◆Mix the powder with water to the ratio on the package — usually a couple parts water to one part powder by volume.
2. ◆Heat it (microwave or stovetop steam) until it thickens, then let it cool and firm up. Heating cooks it into a gel and helps sanitize it.
3. ◆Serve it firm, in a thin layer or grated/sliced into pieces the worms can crawl onto. The texture you want is like a firm gummy or set jelly — not runny, not soggy.

Make chow in small batches, keep prepared chow refrigerated, and use it within a few days. Old chow grows mold and bacteria; toss it at the first sign and never feed sour-smelling food. For the smallest hatchlings, a thin, fresh, finely-spread layer is best so they can latch on.

A note on what doesn't work: lettuce, kale, dandelion, "mulberry-scented" pellets, and other substitutes will not sustain silkworms. They are obligate mulberry feeders. If it isn't mulberry (fresh or as chow), it's slowly starving them.

Hatching silkworms from eggs

If you're going the egg route, here's the process that actually works.

Storing and timing eggs

Silkworm eggs can be refrigerated to hold them in stasis — this is the right use of a fridge for silkworms (the worms must never be chilled, but the eggs benefit from it). Keep eggs cold and dry until about a week to ten days before you want feeders, then bring them out to start the hatch. Don't refrigerate eggs that have already started to develop (you'll see them darken), and never let stored eggs get damp or they'll mold.

Incubation

To hatch, bring the eggs to 78–82°F (25–28°C) with moderate humidity. A small ventilated container in a warm spot works; some keepers use a simple incubator, but room warmth in that band is enough. Healthy eggs darken (often to a bluish-gray) as the larvae develop inside, then hatch over a few days. Expect 7–14 days from warm-up to hatch, sometimes a touch longer.

The critical first hours

Newly hatched silkworms — tiny, dark, and hairy — must reach food fast, within hours. Have fresh, finely-prepared chow or shredded tender mulberry waiting before they hatch. Spread food thinly right over or beside them; the hatchlings will crawl onto it. This first-instar stage is the most fragile and the most disease-prone of the whole cycle, so cleanliness here is everything: fresh food, clean container, washed hands, no condensation. Move hatchlings gently with a soft brush, never by hand — they're delicate enough to injure. Get them eating cleanly and the hardest part is behind you.

Instar by instar: feeding and growth

The larval period is five instars over roughly a month. Here's how the job changes as they grow:

• ◆First instar (newly hatched, ~2–3 mm). Tiny, black, fragile. Finely shredded tender mulberry or a thin smear of fresh chow, kept scrupulously clean. They eat little individually but are at their most vulnerable. Don't let food dry out; don't let anything get damp and moldy.
• ◆Second to third instar (growing, paling). Appetite climbing fast. Bigger pieces of chow or leaf, more often. Frass starts accumulating — begin regular cleaning. From the second instar on, worms are usable as small feeders.
• ◆Fourth instar. Eating heavily; the tub gets dirty quickly. Clean more often, watch for crowding, split trays if needed. Good feeding size for medium animals.
• ◆Fifth (final) instar (~3 inches, ravenous). Peak appetite and peak waste output — they can clear food and foul a tray astonishingly fast, so this is when hygiene matters most. Largest feeder size. Feed them off through this stage before they stop eating and start to wander/cocoon.

A few cross-cutting rules:

• ◆Feed enough that there's always fresh food, but not so much it spoils between cleanings. Spoiled excess is more dangerous than slight hunger.
• ◆Don't feed heavily during a molt. Molting worms (head reared up, gone still, dull-looking) aren't eating; piling on food just fouls the tray. Resume normal feeding once they're moving and eating again.
• ◆Scale cleaning with size. A first-instar tray can go a couple days; a fifth-instar tray of big worms may need attention daily.

The diseases that kill silkworms — and how to dodge them

Silkworms have a well-earned reputation for dying in droves, and it's almost always disease driven by moisture and dirt. You don't need to memorize pathology, but knowing the four classic killers helps you read a sick tray and react fast. (For the underlying husbandry and invertebrate-health background, university entomology programs like the University of Florida's Entomology & Nematology department are a solid, non-commercial reference.)

• ◆Grasserie (a viral disease, nuclear polyhedrosis). Worms turn swollen, yellowish, and shiny, with fragile skin that ruptures into a milky fluid. It spreads explosively through a tub. Driven by heat stress, crowding, and poor food. Response: remove affected worms immediately, improve airflow, cool things down, and clean hard.
• ◆Flacherie (bacterial/viral gut disease). Worms go limp, soft, and dark, often with diarrhea, and stop eating. Tied to spoiled food and contamination. Response: discard all old/wet food, deep-clean, isolate the sick, and wash your hands religiously.
• ◆Muscardine (white muscardine, a fungal disease). Worms harden and become covered in white fungal growth. This is the humidity disease — it blooms in damp, poorly ventilated tubs. Response: dry the setup out, crank ventilation, remove infected worms (which are spore factories).
• ◆Pebrine (a microsporidian parasite). Black pepper-like spots on the body; notably, it can pass through the eggs to the next generation. Response: there's no fixing an infected batch — source eggs and worms from clean suppliers, and never breed from a tub that's shown signs of disease.

The unifying lesson is that all four are husbandry diseases. Keep the tub clean, the food fresh and firm, the air moving, the worms uncrowded, and your hands washed, and you'll dodge essentially all of them. When something does start, the winning move is always the same: remove the sick worms immediately and clean aggressively. Hesitation is what turns one bad worm into a dead tray.

Storing silkworms and slowing them down

Silkworms are on a clock — they keep growing toward cocoons whether you're ready or not — so managing the pace matters.

• ◆Never refrigerate live worms. They're tropical; cold injures and kills them. This trips up keepers used to storing superworms or waxworms cold. The worms stay at room-band temperature, period.
• ◆To slow growth, keep them cooler and feed less. Holding worms in the low-to-mid 60s°F and feeding lightly stretches a batch out without killing them — useful when you've got more worms than your animals can eat right now. They'll grow slowly instead of racing to cocoon. Don't go cold, just cool.
• ◆To stretch supply at the source, store eggs cold, not worms. The clean way to "pause" silkworm supply is to refrigerate eggs and hatch them in waves. That's the real storage lever.
• ◆Feed off before they cocoon. Once worms enter the final instar, plan to use them up. A wandering, head-waving, gut-emptied worm is about to spin and is past its feeder prime.

Feeding silkworms off, by animal

Silkworms shine as a soft, calcium-rich, low-fat feeder, and because they don't bite, climb, or burrow, they're among the safest feeders to simply place in an enclosure. The universal rules: size the worm to the animal (a feeder should be no wider than the space between the animal's eyes), and use silkworms as a rotated part of a varied diet, not the sole food.

• ◆Bearded dragons. Excellent for them — especially gravid females (the calcium and moisture are genuinely valuable) and growing juveniles. Match worm size to the dragon; juveniles take smaller worms more often, adults take large worms as part of a mixed insect diet. A great low-fat alternative to fattening feeders.
• ◆Leopard geckos. A favorite soft feeder. Use small-to-medium worms, sized to the gecko, and offer as a rotated treat or supplement alongside their staple. Their softness makes them gentle on a leopard gecko's digestion.
• ◆Crested geckos. A good protein-and-moisture supplement to a complete crested-gecko diet — offer appropriately small worms occasionally for enrichment.
• ◆Chameleons. Chameleons love silkworms, and the high moisture suits species prone to dehydration. Often a top-tier feeder for veiled and panther chameleons. Size appropriately and offer regularly as part of variety.
• ◆Frogs, toads, and amphibians. Soft and easy to eat; good for many larger frogs and toads. Watch body condition and match size.
• ◆Turtles and other insectivores. Many aquatic and box turtles take silkworms readily as a soft protein source within a varied diet.

A note on dusting and gut-loading

Silkworms can't be gut-loaded with arbitrary produce the way roaches can — they only eat mulberry/chow — but that's fine, because the mulberry diet is the nutrition. Feeding the worms fresh chow right up until you offer them ensures they're full and at their nutritional peak. You can still lightly dust them with a calcium supplement for high-demand animals; their slightly moist surface actually holds dust reasonably well. For most keepers, silkworms' natural calcium and moisture are the whole point — they're the feeder you reach for because you don't have to work to make them nutritious.

How silkworms compare to other feeders

Silkworms occupy a specific, valuable niche: the soft, hydrating, calcium-leaning, low-fat feeder. Here's roughly how the common feeders stack up. Treat these as approximate, as-fed (wet) figures — actual values swing with diet, life stage, and source — but the relationships are reliable, and the relationships are what should drive your choices. (For rigorous numbers, the feeder-insect nutrient-composition research indexed at the U.S. National Library of Medicine's PubMed — particularly Mark Finke's work — is the scientific gold standard.)

The takeaways that matter for a keeper:

• ◆Silkworms are the soft, lean, hydrating option. Their very low fat and high moisture make them ideal for animals you don't want to fatten and for those needing hydration — and their relatively strong calcium content sets them apart from the famously calcium-poor crickets and mealworms. They're the feeder I prioritize for gravid females, picky eaters, and recovering animals.
• ◆They're a supplement/soft-staple, not a sole diet. At ~9–10% protein they don't carry a diet alone the way a roach base does. Rotate them in, don't run on them exclusively.
• ◆Silkworms vs. hornworms. Both are soft, watery, low-fat treat-staples; silkworms bring more calcium and are a bit less purely "water balloon," while hornworms edge them on sheer hydration. Many keepers keep both and rotate.
• ◆The winning diet is a durable staple plus rotated softs. A roach or cricket base for protein, with silkworms and hornworms rotated in for softness, calcium, hydration, and variety, beats any single feeder. Silkworms are the premium soft slot in that rotation.

Breeding your own silkworms

Most keepers buy eggs or worms, but you can close the loop. To breed, let a portion of your healthiest fifth-instar worms spin cocoons instead of feeding them off. Give them somewhere to spin — cardboard "cocooning frames," egg-flat sections, or simply a clean corner with a little structure — and leave them undisturbed. After 10–14 days the moths emerge, mate, and the females lay 300–500 eggs each before dying within a few days (remember, the moths can't fly and don't eat, so they won't go anywhere).

Collect and store those eggs cool and dry, and you've got your next generations. Two honest cautions: the genetics of domestic Bombyx mori can drift in small home batches, and — more importantly — disease like pebrine passes through eggs, so only ever breed from a visibly clean, healthy batch. For pure feeder use, buying fresh eggs or worms from a clean source is often easier than maintaining a breeding line, but breeding is rewarding and cuts cost if you keep it disciplined.

Troubleshooting a struggling batch

Work the causes in order of likelihood — and with silkworms, the likely cause is almost always moisture or hygiene:

• ◆Worms dying off, going limp or dark? Suspect spoiled/wet food and dirty conditions first. Discard all old chow and leaves, deep-clean the tray, isolate any sick worms, improve airflow, and wash your hands before every contact. This is flacherie-type disease until proven otherwise.
• ◆Swollen, yellowish, shiny, bursting worms? Likely grasserie, pushed by heat and crowding. Remove affected worms immediately, cool the setup, reduce density, clean hard.
• ◆White fuzzy growth on worms? Muscardine fungus — a humidity problem. Dry everything out, maximize ventilation, remove infected worms (they spread spores).
• ◆Mold on the food or condensation on the lid? You're too wet. Use firmer chow, smaller portions, more ventilation, and wipe condensation daily. This is the precursor to most die-offs — fix it before worms start dying.
• ◆Worms not growing / barely eating? Check food freshness and temperature. Stale or wrong food (anything but mulberry/chow) starves them; too-cool temps stall them. Offer fresh chow and confirm you're in the high 70s to low 80s°F.
• ◆Worms wandering, waving their heads, gut emptied, refusing food? They're about to cocoon, not sick. Feed them off now — they're at the end of their feeder window.
• ◆A whole batch fails fast and repeatedly? Suspect contaminated source stock or pesticide exposure (a sprayed leaf, a residue on hands or container). Switch to a clean supplier, double-check your mulberry source, and disinfect all equipment between batches.

Sourcing healthy silkworms and eggs

Because silkworms are so disease-prone and a bad batch can carry egg-borne infection, starting clean is half the battle. Buy from a supplier that keeps its stock properly and ships healthy, active worms or viable eggs. Look for worms that are plump, pale, and moving, with no dark, limp, or shriveled individuals in the cup, and chow that's firm and fresh rather than wet and sour. When you need to start or restock a batch, All Angles Creatures stocks healthy silkworms and silkworm chow sized for both growing out and feeding off directly.

When new worms arrive, get them onto fresh food in a clean tray right away, keep that first batch a little isolated until you're sure it's healthy, and resist mixing questionable stock into a thriving tray. A little quarantine discipline keeps one bad cup from taking down everything you're raising.

The short version

Keep silkworms clean, ventilated, and slightly dry at 78–82°F, feed them fresh mulberry or firm (never soggy) chow, remove waste and condensation constantly, never crowd them, wash your hands before every contact, and pull any sick worm the instant you see it. Don't refrigerate the worms (store eggs cold instead), and feed them off before they cocoon. Do that and silkworms reward you with the cleanest, softest, most hydrating, calcium-rich feeder in your rotation — perfect for gravid females, picky eaters, and any animal that needs something gentle.

They're not a hard feeder. They're an unforgiving one — and once the hygiene rhythm is second nature, that distinction disappears and you're left with a genuinely excellent feeder you grew yourself.

Building out your feeder rotation? Pair these with a durable colony staple — see my full guide to keeping discoid roaches — or browse the complete feeder insect care library for hornworms, roaches, and the rest.