Sphagnum Moss for Reptiles and Humid Hides

Quick answer: sphagnum moss is the usual filling for a reptile's humid hide, a closed hide with damp moss inside that gives a pocket of moist air in an otherwise drier vivarium. Leopard geckos, corn snakes and royal pythons all benefit from one, especially around a shed, and keepers use the same damp moss in a female gecko's laying box. Keep it damp but never dripping, keep the damp inside the hide, and change it when it is soiled, sour or mouldy.

I bred leopard geckos as a hobby, and my first isopods went into my Burmese python's vivarium as a clean-up crew. We sell our sphagnum for invertebrate keepers, but it is the same moss that goes into reptile hides, so this guide covers what reptile keepers use it for, how damp it should be, and the few things that go wrong with it.

What a Humid Hide Is and Which Reptiles Need One

A humid hide is a closed hide, a box or cave with one entrance, with a layer of damp moss inside. The rest of the vivarium stays at whatever humidity the species needs, while the air inside the hide stays moist. The RSPCA's care advice includes one for leopard geckos, corn snakes and royal pythons, and notes that many other reptiles benefit from one too.

The main reason is shedding. A gecko will spend time in a humid hide before a shed, softening the old skin so it comes away cleanly. When the air is too dry, shed tends to stick, and stuck shed on a leopard gecko's toes can cost it the toes. Never pull shed off, and if a snake keeps its eye caps after a shed, get a reptile vet to look at it. A humid hide can help with shedding, but it will not fix a vivarium that is wrong in other ways.

The RSPCA does not say where the humid hide should go, only that hides in general belong at both ends. Keeper guides differ: some put it in the middle of the vivarium, some at the cooler end and some on the warm side. Do not chase a humidity figure inside the hide: the test is whether the moss is damp.

A mound of golden-orange and green sphagnum moss with fine, feathery strands on a dark grey surface

How Damp Is Damp Enough?

Squeeze a handful. It should feel damp and springy, with no water running out between your fingers. If water drips, wring it out before it goes in. Wet moss does no good: it soaks the floor of the hide, and a wet floor or a stuffy vivarium is how reptiles from dry places end up with skin and breathing problems. The RSPCA advises low humidity for leopard geckos and bearded dragons for exactly that reason, so keep the damp inside the hide rather than across the floor.

Re-wet the moss when the top feels dry. In a warm vivarium that can be daily, in a cooler one every few days. For a reptile's hide, clean water is all the RSPCA asks for. Frogs and other amphibians are different, because water passes through their skin: use a tap-water conditioner that says it treats chloramine as well as chlorine. Our guide to whether tap water is safe for isopods explains why chloramine needs the right product.

Change the moss completely when it is soiled, smells sour, turns slimy or grows mould, and wash the hide at the same time. Old damp moss is also where mould mites build up, because they feed on the fungus that grows in the damp. They are not snake mites, which live under the snake's scales, feed on its blood and lay their eggs off the snake, around the vivarium.

Laying Boxes for Geckos and Other Lizards

Female leopard geckos, bearded dragons and many other lizards need somewhere to dig before they lay. Given nowhere suitable, many will hold on to their eggs for a long time, and a female that cannot lay can become egg-bound, which needs a vet. Some, leopard geckos and bearded dragons included, can produce eggs without ever meeting a male, so an adult female needs a laying site whether or not you plan to breed.

For geckos the usual laying box is a covered tub with an entrance hole, filled with damp sphagnum or a moist peat-free soil mix, deep enough to dig in. The RSPCA advises a nest box of moist soil or a sand and soil mix for leopard geckos, keepers use damp sphagnum as well, and a damp-moss humid hide often doubles as a laying box. For bearded dragons the RSPCA suggests a lightly sprayed digging box of sand and soil instead.

The laying box is for laying, not hatching. Eggs that are going to be incubated usually go into the incubator on damp vermiculite or perlite, though some breeders use sphagnum.

Tortoises, Frogs and Tropical Vivariums

Red-footed tortoises need a humid set-up, and a UK tortoise care sheet lists sphagnum moss among its suggestions for their hides. Our guide to isopods with red-footed tortoises covers a humid tortoise set-up with a clean-up crew.

In tropical vivariums moss goes on the floor rather than in a box. The RSPCA's crested gecko advice covers the soil with a layer of moss or leaves, and one university herpetarium floors its dart frog tanks with about 5cm of sphagnum. Our guide to isopods for dart frog enclosures covers the clean-up crew side, and our bioactive terrarium guide sets out the layers underneath. Damp moss is also where springtails settle in, grazing the fine debris that collects in it.

Is Sphagnum Moss Safe If a Reptile Swallows It?

Some keepers worry that a gecko will swallow moss with its food and block its gut. We found no published case of moss causing a blockage. The RSPCA warns that calcium sand, beech chips and other non-natural loose substrates can cause impaction in leopard geckos, yet it still puts damp moss in the humid hide, and it describes impaction as a sign of underlying problems, such as the wrong temperatures, dehydration or a vitamin shortfall. Even so, feed away from the humid hide, and if you have an animal that keeps eating its moss, use damp paper towel in the hide instead.

Sphagnum Moss Is Not Peat

Sphagnum is the plant itself: the living top layer of a bog, cut and dried. Peat is what builds up underneath, plant material that has only partly decayed in waterlogged ground, at around a millimetre a year. We do not sell peat. The government has said it will end the sale of peat for gardening in England, but it has not yet passed a law or set a date, so no ban is in force. There is more on the difference in our guide to sphagnum moss for isopods.

Dried sphagnum is harvested commercially in places such as New Zealand and Chile. Please do not take moss from the wild. In Britain it is an offence to uproot any wild plant without permission from the landowner or occupier, and on protected sites such as Sites of Special Scientific Interest, damaging what the site is protected for is a separate offence.

Hygiene for You as Well

Sporotrichosis is a fungal infection, and the fungus behind it lives in the environment on soil and plants, sphagnum moss among them. It gets in through cuts and scrapes. Cases are rare in the UK, but it costs nothing to cover any cuts or wear gloves when you handle moss, and to wash your hands afterwards, which is worth doing after any vivarium clean.

Our Sphagnum Moss

Our pre-moistened sphagnum moss arrives damp and ready to use, with no soaking needed. Give it a squeeze before it goes in to make sure it is not dripping.

Frequently Asked Questions

What kind of moss is best for a leopard gecko's humid hide?

Damp sphagnum moss, squeezed so it is not dripping. Damp paper towel does the same job if your gecko keeps eating the moss.

Do leopard geckos need a humid hide?

Yes. The RSPCA's leopard gecko advice includes one, and geckos use it to soften their skin before a shed.

Should a humid hide go on the warm side or the cool side?

The RSPCA does not say, and keeper guides differ: some put it in the middle, some at the cooler end and some on the warm side.

How often should I change the moss in a humid hide?

Re-wet it when the top feels dry, and change it completely when it is soiled, smells sour or grows mould.

What goes in a crested gecko egg laying box?

Damp sphagnum or a moist peat-free soil mix, deep enough for her to dig, in a covered box she can get into.

Can I incubate reptile eggs in sphagnum moss?

Some breeders do, but damp vermiculite or perlite is the usual choice in the incubator.

Is sphagnum moss the same as peat moss?

Not as the names are used in shops. Sphagnum is sometimes called peat moss, but a bag sold as peat moss is usually peat: the part-decayed layer that builds up beneath the living moss over thousands of years.