Protection from the cold: a stable environment for your worms.
Helps control pests: reduces fruit flies.
SIZE1 mat
1 mat
5 mats
10 mats
$2.04
€1.82 · Payment in euros · prices in USD at today's exchange rate
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Designed and made in France, this hemp mat, or high-density moisture pad (3.3 oz/ft² (1000 g/m²), about 0.2 in (5–6 mm) thick), is specially designed to retain moisture in the top tray of your worm composter, where the worms are most active. It sits directly on the worms in the active tray (the top tray), keeping them comfortable and productive.
Benefits and use:
Retains moisture: keeps the top layer damp so your composting worms stay active and efficient.
Encourages worm movement: lets the worms come up to the surface to feed and break down food scraps faster.
Protection from cold and temperature swings: provides a stable environment for your worms and food scraps.
Limits insect growth: reduces outbreaks of fruit flies and other pests.
Eco-friendly and degradable: 100% natural, the mat breaks down over time and can be eaten by the worms.
Handy tip: lightly soak the mat with WORMboost diluted in water to boost worm activity.
The round 15.7 in (40 cm) diameter size fits the following worm composters: WORMbox, Eco-Worms, Can-O-Worms.
The hemp mat is the must-have accessory for keeping your worm bin running efficiently, protecting your worms, improving compost quality, and keeping pests at bay, all naturally and sustainably.
Technical specifications Hemp mat / Round moisture pad
Place directly on the worms in the active (top) tray
Dimensions and material
Density / thickness
29.5 oz/yd² (1000 g/m²), 0.2–0.24 in (5–6 mm)
Overall dimensions
Length 15.7 x Depth 0.4 x Height 15.7 inches (40 x 1 x 40 cm)
Weight
3.7 ounces (105 grams)
Manufacturing
Country of manufacture
France
Box contents and warranty
Warranty
2 years
Your questions about the Round hemp mat
The farm's answers to the questions our customers ask us most often.
The round hemp mat, 15.7 in (40 cm) in diameter, is cut to fit WORMbox, Eco-Worms, and Can-O-Worms worm bins. It sits right in the active tray as is, with no cutting needed.
The round mat is available individually or in packs of 5 or 10. Since a mat lasts 2 to 3 months on average, the packs make sure you never run out. Our customers rate it 4.71/5 from 51 reviews, and several mention that it helps keep fruit flies and fungus gnats at bay. For a different model, check out our square, rectangular, or oval mats, or the XXL mat you can cut to size.
In your WORMbox, Eco-Worms, or Can-O-Worms, the round mat acts as a blanket laid over the fresh food scraps. It keeps the surface moist, shields the worms from light, and limits access for fruit flies. The worms also love to shelter and breed underneath it.
The round hemp mat isn't required: brown cardboard, changed often, or an old 100% cotton floor rag can take its place. Our high-density hemp mat (29.5 oz/yd² (1000 g/m²), 0.20–0.24 in (5–6 mm) thick) is 100% natural and is designed and made in France.
Yes, they love it! In your WORMbox, Eco-Worms, or Can-O-Worms, the round hemp mat keeps the surface cool and moist: the worms come up under the mat to feed and break down fresh food scraps faster.
It's also one of their favorite places to lay eggs: you'll spot small yellowish cocoons there, a sign of a thriving colony. The round mat protects them from the cold and from temperature swings. And because it's 100% natural, your worms even end up nibbling on it.
Lay the round hemp mat flat, directly on the worms and food scraps in the top tray, just beneath the lid. Food always goes underneath it: lift the mat, add your peels and cardboard, then put it back in place.
There's no need to wet it: it goes in dry and soaks up the moisture released by the food scraps. To give your worms a boost, you can spray it from time to time with diluted WORMboost (2 to 3 capfuls in 8.5 fl oz (¼ liter) of water).
When your first tray is three-quarters full, add a new one on top and move the round mat up into it: it always stays in the active tray, the one you're feeding. One mat is all you need for the whole worm composter.
If you put the WORMbox planter on in place of the lid, remove the mat: you won't need it anymore, because the plant roots absorb the excess moisture from the tray below on their own.
For the round hemp mat, expect it to last 2 to 3 months on average, sometimes longer: it depends on the moisture level and how hungry your colony is. Hemp is meant to be nibbled, so it's normal to see it thin out and develop holes.
When it's almost gone, lay the new disc directly on top: the old one may still hold cocoons, and the worms will finish eating it. If it's still thick, crumble it up a bit and mix it into the food scraps. Packs of 5 or 10 round mats ensure you always have a spare on hand for your WORMbox.
Can't find your answer? Write to us. We answer every question by email.
Customer reviews for Hemp mat / Round moisture pad
4,7 /5
62 reviews · 85 % verified reviews including 61 from other countries, translated
62 reviews
T
TraceyChesterfield
Verified Purchase
Great product to keep them snuggled in21/10/2026
Model: 10 matsRole of the mat: Retain moisture, Limit fruit flies, Keep the worms in, Protect from cold or heatTime before buying more: More than 6 monthsWorm composter used: WORMbox
We’ve had our wormery for five weeks. We put one of these on the top of them as suggested and it’s still going strong.
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C
ChloeArras
Verified Purchase
20/10/2026
Model: 5 matsRole of the mat: Retain moisture, Protect from cold or heatTime before buying more: More than 6 monthsWorm composter used: WORMbox
Automatic translation from FrenchOriginal text from French
I've been using this hemp mat since my worms arrived 15 days ago. I'm squeamish about touching them, so I really like having the hemp mat to put over the peelings, and the worms seem to like it too.
J’utilise ce tapis de chanvre depuis l’arrivée de mes lombrics il y a 15 jours. Moi qui suis frileuse de les toucher, j’aime bien avoir le tapis de chanvre à mettre sur les épluchures, les vers semblent aimer aussi.
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E
EmmaSt Jeannet
Verified Purchase
19/10/2026
Model: 5 matsRole of the mat: Retain moisture, Limit fruit flies, Keep the worms in, Protect from cold or heatTime before buying more: 3 to 6 monthsWorm composter used: WORMbox
Automatic translation from FrenchOriginal text from French
I think the hemp mat is really good. It covers the food well, keeps the moisture in and ends up in the worms' bellies, so there's no waste!! I recommend it
Je trouve que le tapis de chanvre est vraiment bien. Il couvre bien la nourriture, garde l'humidité et termine dans le ventre des lombrics donc pas de gaspillage ! ! Je recommande
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C
CarineBruxelles
Verified Purchase
Very good22/10/2026
Model: 10 matsRole of the mat: Retain moisture, Keep the worms inTime before buying more: More than 6 monthsWorm composter used: WORMbox
Automatic translation from FrenchOriginal text from French
I tried cardboard, but mats are the best. I ordered 10 straight away.
Très bien J'ai essayé des cartons mais le mieux c'est les tapis.j'en Ai commander 10 directement
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M
MarionAngers
Verified Purchase
Effective!22/10/2026
Model: 10 matsRole of the mat: Retain moisture, Limit fruit flies, Keep the worms in, Protect from cold or heatTime before buying more: 3 to 6 monthsWorm composter used: WORMbox
Automatic translation from FrenchOriginal text from French
I've been using them for several months. They're very effective!
Efficace ! Je les utilise depuis plusieurs mois. C'est très efficace !
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P
PierreSt Jeannet
Verified Purchase
A must!22/10/2026
Model: 1 matRole of the mat: Retain moistureTime before buying more: 3 to 6 monthsWorm composter used: WORMbox
Automatic translation from FrenchOriginal text from French
A must when you buy a worm composter, to absorb the moisture. Change it from time to time! It also helps reduce worm escapes at the beginning!
Impératif ! Impératif lorsque vous achetez un lombricomposteur pour garder absorber l'humidité. A changer de temps en temps ! Permet egalement de réduire au début l'évasion des vers de terre !
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C
ChristineToulon
Verified Purchase
Hemp mats22/10/2026
Model: 10 matsTime before buying more: Less than 1 monthWorm composter used: WORMbox
Automatic translation from FrenchOriginal text from French
Hello, I have had my worm composter for many years and I have always bought all my accessories from Moutta Farm, which has always given me great satisfaction, but now, how can I put it... I am very disappointed. The hemp mats I received are nothing like the ones from the beginning! Before, I could lift them very easily for more than a month without any problem to add my peelings, but now, after 15 days, they fall apart between my fingers in no time. Or else, another possibility, my worms have mutated and become "hemp-eaters" +++ No, seriously, I am quite disappointed, and your email arrives at just the right time, because I was thinking of calling you. On the other hand, still no problem with fungus gnats, and they still retain moisture very well. Then again, it's true that, as the price has never changed, maybe the density of the mat is lower... Kind regards Christine
Tapis de chanvre Bonjour, cela fait de nombreuses années que j'ai mon lombricomposteur et je me suis toujours servie, pour tout ce qui est accessoire, à la ferme du Moutta , qui m'a toujours donné grande satisfaction, mais là, comment vous dire... je suis très déçue. Les tapis de chanvre que j'ai reçus n'ont plus rien à voir avec ceux des débuts ! Avant je pouvait les soulever très facilement pendant plus d'un mois sans souci pour déposer mes épluchures, maintenant passé 15 jours, ils se délitent entre mes doigts vitesse grand V. Ou alors, autre possibilité, mes lombrics ont muté et sont devenus "chanvrivores" +++ Non, plus sérieusement je suis assez déçue et votre mail tombe à pic, car j'envisageai de vous téléphoner. En revanche toujours aucun problème de moucheron, et ils gardent toujours très bien l'humidité Après c'est vrai que, comme le prix n'a jamais changé, peut-être que la densité du tapis est moindre... Cordialement Christine
Reply from Moutta Farm Thank you for your loyalty to Moutta Farm and for your feedback.
Our hemp mats are approximately 5 to 6 mm thick. It is possible that your worms are attacking them more than before. In principle, compost worms prefer to feed on decomposing organic matter, particularly fruit and vegetable peelings, rather than on the hemp mat itself.
If your worms are particularly active or if other food inputs are insufficient, they may contribute to the breakdown of the mat, which could explain why it disintegrates more quickly.
Nevertheless, we have taken note of your comment regarding the difference in durability compared with the mats you used previously, and we thank you for pointing it out.
We are delighted to hear that you still have no problem with gnats and that the mats retain moisture well, and we hope you will continue to be satisfied with your worm composter.
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L
LouisBussieres
Verified Purchase
Perfect21/10/2026
Model: 10 matsRole of the mat: Retain moisture, Keep the worms in, Protect from cold or heatTime before buying more: 3 to 6 months
Automatic translation from FrenchOriginal text from French
It was my first time.
Parfait C était là première fois
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S
SilèneSallanches
Verified Purchase
Good21/10/2026
Model: 5 matsRole of the mat: Retain moisture, Limit fruit fliesTime before buying more: 1 to 3 monthsWorm composter used: WORMbox
Automatic translation from FrenchOriginal text from French
Good, even though I find it wears out very quickly… It limits fungus gnats a little It doesn't stop the worms from getting out at all, since they go right through it On the other hand, it really keeps the moisture in well
Bien Bien même si je trouve qu’il s’use très vite… Ça limite un peu les moucherons Ça n’empêche pas du tout les vers de sortir puisqu’ils passent à travers Par contre ça garde vraiment bien l’humidité
Reply from Moutta Farm Thank you for your feedback! The hemp mat is indeed very effective at retaining moisture and helps limit fungus gnats. Since it is made of natural fibres, it gradually breaks down through contact with moisture and the activity of the worms. As for worms passing through it, that is completely normal: the mat is not designed to stop them from getting out. Feel free to contact us.
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PatriceMetz
Verified Purchase
Very good product20/10/2026
Model: 10 matsRole of the mat: Retain moistureTime before buying more: 3 to 6 monthsWorm composter used: Other
Automatic translation from FrenchOriginal text from French
Product as described and easy to cut to fit the size of the composter!
Très bon produit Produit conforme à la description et facile à découper pour l'ajuster à la dimension du composteur !
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Reviews are published after an automated check, with no filtering by rating. “Verified purchase”: review linked to a delivered order. Reviews may be rewarded with loyalty points, regardless of the rating. Reviews from other countries are automatically translated.
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