Spawn and substrates.

Finely milled calcium carbonate. A gentle, slow pH buffer that holds your casing and bulk mixes steady and adds calcium, without the caustic bite of hydrated lime.

Organic wholegrain brown rice flour, the nutrient half of a classic PF Tek substrate. You mix it with vermiculite and water, sterilise it in jars, then grow from it.

A soluble 15.5-0-0 calcium nitrate: a calcium and nitrogen supplement for compost-grown mushrooms like button and portobello, and for the casing layer that goes on top.

Heat treated, pelletised poultry manure. A slow release nitrogen and mineral feed for the compost you build for button, portobello and other compost loving mushrooms.

A compressed block of coconut-fibre coir. Add boiling water and it breaks down into a clean, water-holding bulk substrate for fruiting mushrooms.

Aged, screened cow manure compost for manure-loving mushrooms. Crumbly and low in odour, it blends with coir or straw and rehydrates to roughly 3 litres from a 1 kg pouch.

Powdered calcium sulfate that keeps grain spawn loose and free running, and adds calcium and sulphur without moving the pH.

Compressed pure hardwood pellets that swell into wet sawdust when you add hot water. The standard base for fruiting blocks, used plain for oysters or blended with soy hull pellets for richer mixes.

Aged, screened horse manure for growing dung-loving and compost-loving mushrooms. You hydrate it, pasteurise it, then spawn it. A base ingredient, not a ready-to-fruit kit.

Calcium hydroxide powder for cold water lime pasteurising straw and other bulk substrates. Stirred into the soak water it raises the pH high enough to knock back competing moulds and bacteria, with no heat needed.

A jar of sterile rye grain fully run through with live King Oyster mycelium, ready to mix into your own bulk substrate. The colonised middle step, done for you.

A jar of live lion's mane mycelium grown through sterilised grain, ready to mix into bulk substrate so you can fruit your own Hericium erinaceus at home.

Small, hard millet kernels for making grain spawn. The fine size packs many more growing points into each jar, so colonised spawn breaks up well and spreads fast through bulk substrate.

Expanded volcanic glass. Used wet as a humidity buffer in fruiting chambers, and dry as an airy amendment in substrate and casing mixes.

Cleaned whole rye grain for making mushroom spawn. It holds water well, carries the nutrients mycelium needs, and the grains stay separate after sterilising so you can shake the jar to spread growth.

A jar of grain fully run through with living shiitake mycelium, ready to mix into hardwood sawdust and grow on. This is the spawn step, not a finished kit.

Sterile organic rye grain spawn, ready for you to inoculate. Inject your own gourmet culture, let it colonise, then expand it into your own bulk substrate. Sold singly or as a set of three.

A concentrated dry nitrogen supplement for Phase I mushroom compost. Mixed in at the start of composting to raise nitrogen and feed the microbes that heat and condition the substrate.

Expanded mineral flake that soaks up water and lets it go slowly. The standard moisture buffer for PF Tek cakes, bulk coir mixes and casing layers.

Clean whole wheat grain for making mushroom grain spawn. Medium kernels hydrate evenly and shake apart well, so colonised grain spreads through the jar instead of clumping.

A sealed tub of sterilised wholegrain with a self-healing injection port. Inject your own legal gourmet culture, let it colonise, then break it up and use it to seed a bulk substrate.