Hornworms and BSFL for Bearded Dragons
Hornworms and black soldier fly larvae for bearded dragons: why BSFL are a calcium-rich staple, how hornworms aid hydration, and how to feed each one safely.
Hornworms and black soldier fly larvae are two of the most useful feeders in a bearded dragon keeper's toolkit, but they play very different roles. Black soldier fly larvae are a calcium-rich staple you can feed regularly, while hornworms are a soft, hydrating treat best used to tempt picky eaters or boost water intake. Knowing the strengths of each lets you use them strategically. This guide covers the nutrition, sizing, and care of both, and when to reach for each one.
Hornworms, BSFL, and Supplies
Fluker's Live Black Soldier Fly Larvae (500 ct)
$13.19 on Amazon
Calcium-rich staple, no dusting needed, ideal for babies.
Oregon Silkworms Live Hornworms (26-35 ct)
$14.99 on Amazon
Soft, hydrating treat to tempt picky or recovering dragons.
Fluker's Reptile Calcium Without D3
$4.79 on Amazon
Dust hornworms and other feeders for balanced calcium.
Black soldier fly larvae: the calcium staple
Black soldier fly larvae, sold under names like Phoenix worms and calci-worms, are one of the best feeders you can offer. What sets them apart is their naturally high calcium content and favorable calcium-to-phosphorus ratio, which is rare among feeder insects. That means BSFL often do not need dusting, and they actively support bone health rather than just adding protein. They are small, soft-bodied, and easy to digest, which makes them an outstanding staple for fast-growing babies whose bones demand calcium. They also arrive in a tidy, self-contained cup and need almost no care.
Because of their calcium advantage, many keepers use BSFL as a core staple alongside dubia roaches and crickets, rotating them in to reduce how often they have to dust. They are slightly pricier per insect than crickets, but the nutrition and convenience make them well worth including.
Hornworms: hydration and appetite
Hornworms are a different kind of tool. At roughly 85 percent moisture, they are excellent for hydration, which makes them valuable for a dragon recovering from illness, one that is mildly dehydrated, or one that does not drink readily. They are soft, low in fat, and brightly colored, and their movement strongly tempts dragons that have gone off their food. The trade-off is that they are low in protein and other nutrients, so they cannot carry a diet on their own. Use them as an occasional treat, a hydration boost, or a way to coax a picky eater, not as a daily feeder.
One quirk of hornworms is how fast they grow. They can roughly double in size in a matter of days, so a small hornworm can quickly become too large for the space between your dragon's eyes. Feed them while they are still appropriately sized, and do not let them outgrow your dragon in the cup.
Comparison
| Feeder | Role | Key strength | Dusting |
|---|---|---|---|
| Black soldier fly larvae | Staple | Naturally high calcium | Usually not needed |
| Hornworms | Treat / supplement | High moisture, tempts eaters | Dust to add nutrients |
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Keeping both feeders
Both feeders are refreshingly low-maintenance. BSFL stay in their cup at room temperature and last a couple of weeks, ready to use straight away. Hornworms also live in their own habitat cup with food gel, but they grow fast, so plan to feed them within a week or so and never refrigerate them, which can kill them. Keep both out of direct heat. Their easy care is part of what makes them such handy additions to a feeding routine.
Putting them to work
Use BSFL as a regular calcium-rich staple, especially for babies and juveniles building bone, and lean on them to cut down on dusting. Reach for hornworms when you need to hydrate, tempt a picky or recovering dragon, or simply offer enrichment and variety. Together, these two feeders cover two important needs, bone-building calcium and hydration, that your everyday crickets and dubia roaches do not address as well. Round out the diet with daily greens, proper UVB, and calcium dusting on your other feeders, and your dragon will have everything it needs to thrive.
Frequently Asked Questions
Are hornworms good for bearded dragons?
Hornworms are a good supplemental feeder, especially for hydration and tempting picky eaters. They are soft, low in fat, and about 85 percent moisture, which makes them useful for a dragon recovering from illness or one that needs extra water. However, they are low in protein and other nutrients, so they work as a treat or supplement rather than a daily staple feeder.
What are black soldier fly larvae and are they good for bearded dragons?
Black soldier fly larvae (BSFL), also sold as Phoenix worms or calci-worms, are one of the best staple feeders available. They are naturally high in calcium with an excellent calcium-to-phosphorus ratio, so they often do not need dusting. They are small, soft, and easy to digest, which makes them especially good for fast-growing babies that need calcium for bone development.
Do black soldier fly larvae need to be dusted with calcium?
Usually not. BSFL are unusual among feeders because their natural calcium content and calcium-to-phosphorus ratio are already favorable, so you generally do not need to dust them. This makes them a convenient staple. You should still gut-load and dust your other feeders like crickets and dubia roaches, but BSFL can go straight from the cup to your dragon.
Can baby bearded dragons eat hornworms and BSFL?
Yes to both, with sizing in mind. Black soldier fly larvae are an excellent staple for babies thanks to their calcium and small, soft bodies. Hornworms grow quickly, so for a baby you must offer small ones that do not exceed the space between the eyes. Use BSFL as a regular feeder and hornworms as an occasional hydrating treat for young dragons.
How do I keep hornworms and BSFL alive?
Both come in self-contained cups that require little care. Keep hornworms at room temperature in their cup with the provided food, and they will grow rapidly, so feed them before they get too large. BSFL also stay in their cup and last a couple of weeks at room temperature. Avoid refrigerating hornworms, which can harm them, and do not let either feeder overheat.
Why do keepers use hornworms for sick or dehydrated dragons?
Hornworms are roughly 85 percent water and are soft and easy to eat, so they help rehydrate a dragon that is not drinking well or is recovering from illness. Their bright color and movement also tempt dragons that have lost their appetite. They are a useful tool in those situations, but because they are low in protein and minerals, they supplement rather than replace a balanced diet.
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