The Future is Insects

  • Home

Our Mission


AgriGrub is pioneering a sustainable solution to food waste in the UK using a remarkable insect called the Black Soldier Fly.

By reducing food waste, we are creating both highly nutritious feedstock and a unique fertiliser for plants


 What We Do


Black Soldier Fly Alchemy

Turning food waste into gold

We breed Black Soldier Flies and their larvae. We feed waste vegetables and fruit to the larvae and when they are optimum size we sell them to distributors of reptile live feed. The virtuous by-product is frass, a sustainable source of micro-nutrients for seedlings and plants. 


What are Black Soldier Flies?

Unsung hero

Black Soldier Flies are not pests, quite the opposite their larvae are key decomposers helping the whole ecosystem tick over nicely. Although the adults themselves do not feed, as larvae they use their unique gut biochemistry to unlock nutrients in the soil, so that they can be used by plants and animals once again.

Calci Worms


Why choose Calci Worms?

Super food of the insect world

Black Soldier Fly larvae, known as Calci Worms, are nutritionally superior to alternates like meal-worms.

High levels of protein , both important to reptile development, are higher in our larvae than in mealworms.

Calcium concentrations, key for healthy reptile development, are also 55 times higher.


Why choose OUR Calci Worms?

The biggest, fattest Calci Worms

With our environmental optimizations, our larvae have are larger (20mm long vs. 14mm long from competitiors) and have a higher fat content and rich in carotenoid pigmentation. These qualities all help improve the reptile health, making our larvae the obvious choice for your scaly friends.

We produce calci worm "popcorn" - dried, puffed up larvae - that provides a nutritious feed for poultry and wild birds.

 Insect Frass


We produce FRASS

Truly environmental fertiliser

FRASS is the byproduct of insect cultivation, and is made of insect droppings, skin casings and organic carbon. Because it is made by growing insects on food waste, it is a truly green and sustainable organic fertliser for the garden. Other organic fertilisers don’t use harsh chemicals, but they can be ecologically damaging, like seaweed fertliser which results in marine degradation, or volcanic rock dust which is mined from inactive volcanoes. In contrast, FRASS uses food waste that would otherwise go to landfill and so reduces greenhouse gas emissions.

6FRASS works as a fertiliser

Boost for healthier plants

The skins of insects are made from a compound called chitin, which is rich in nitrogen, phosphate and potassium for growing plants, but, because it is bound up in chitin, these nutrients are released slowly and not washed out of the soil by rain. When chitin breaks down in the soil is makes a molecule called chitosan.

Chitosan is excellent at binding other essential nutrients (micronutrients like iron, calcium and manganese) which are also present in FRASS, providing the right range of nutrients for happy, healthy plants.

FRASS also contains nitrogen fixing bacteria, which take nitrogen from the air and make it available to plants, and mycorrhizal fungi, which partner with the plant roots to improve the uptake of key nutrients, especially phosphate.


8FRASS works as a biopesticide

Defense against garden pests and diseases

Chitosan also acts as a biopesticide and disease resistance agent. The mechanism behind this is not well understood, but it is thought to act in three ways:

  • FRASS makes the plant think it is under attack by insects, so it increases its immune system to fight of disease and pests, a bit like a vaccination.

  • FRASS encourages microbes in the soil that fight disease to grow and release enzymes into the soil to attack pathogens, including soilnematodes and their eggs.

  • FRASS directly subdues some plant diseases, especially those which attack Solanaceae (tomatoes, peppers, potatoes) and Cucurbits(cucumbers, courgettes, squashes, pumpkins, melons). It is particularly effective in preventing late blight of tomatoes and potatoes.


2How to use FRASS

  • Mix one part FRASS to twenty parts compost for a supercharged nutrient mix to germinate seeds, or for cuttings or potting on seedlings.

  • Put 50ml (about two tablespoons) of FRASS into the bottom of the hole when planting out. The FRASS will encourage roots to grow downwards and protect them from diseases.

  • Sprinkle FRASS around the base of pot plants and perennials and water thoroughly. FRASS will slowly break down and deliver nutrients the plant roots.

  • Mix 100ml (about four tablespoons) of FRASS into a 10L watering can to make a potent liquid feed perfect for fruiting plants. FRASS tea can be watered directly onto leaves, which results in the nutrients being absorbed by the leaves where they are really needed. This also a great way to knock back fungal leaf infections, such as mildew and blight.


Always water thoroughly when using FRASS. In their excitement to take up nutrients the plants can often leave plants feeling thirsty. If your plants don’t look happy in the few days after applying FRASS, keep watering and after a week you should see fresh, vigorous growth.