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The qualities of Mushroom Compost

What is Mushroom Compost

As Used by Monty Don follow the link to his article in the guardian gardening section.

The mushroom compost is low in soluble nitrogen, which means there is little risk of plant burn, the total nitrogen is present in such a form that it will be released over time as further decomposition takes place. Phosphate, potassium. calcium and magnesium levels are quite high. Salinity is well below the levels found in conventional manure, the micro element analysis is good for copper, high for zinc manganese and iron and slightly low for boron.

Composition of Spent Mushroom Compost

Nitrogen: 22.5
Iron: 2153
Phosphorous: 12.5
Manganese: 376
Magnesium: 6.7
Zinc: 273
Sodium: 2.7
Potassium: 25.0
Boron: 37
Calcium: 72.5

Uses of Mushroom Compost


This means spreading mushroom compost onto the surface of the soil, there is no need to dig it in. As a fertilising mulch it maintains the soil and increases the nutrients. It will improve the soil structure and helps make existing soil food more readily available to plants Mulching helps retain moisture in the soil and most importantly reduces the number of weeds which grow. SO YOU DON’T HAVE TO DO MUCH WEEDING!

Soil Conditioning

If you have very heavy clay soil, or one which has been compacted mushroom compost is an ideal soil conditioner. If the compost is spread on the surface and is then dug into the soil it will lighten and help to aerate the soil. The soil will take on a crumbly texture. The soil is subsequently easy to work.

  • Compost should then be incorporated on an annual basis to maintain this structure.
  • Mushroom compost should not be used on acid loving plants as at is slightly alkaline.
  • On the vegetable patch apply to crops that like a richer soil such as cabbages, courgettes, potatoes, tomatoes & pumpkins.
  • Mushroom compost is best applied in the spring before planting, so that the growing plants can get the best from it. It is also useful as a mulch on brassicas for a mid season fertility boost, this includes growing trees and those on dwarf rootstocks.
  • In the fruit garden, Mulch blackcurrants annually as they are greedy feeders. Mulch strawberries every year if they are on poorer soils. On container plants Apply once a year to the surface of the pot.
About Us
Bilting Farm has been growing mushrooms in Kent since the 1930's and produces some of the finest mushroom compost in Kent. In addition, the farm now grows small quantities of speciality mushrooms for farmers' markets and is committed to supplying high quality fresh produce to local customers.

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Get in Touch
If you have any questions or queries, please do not hesitate to get in touch.
Tel: : 01233 812631

Post: Bilting Farm, Bilting, Ashford, Kent, TN25 4HA