RHS Level 2 R2102 Compost Types

Question 1

Name different types of Compost.

Answer 1

Peat based.
Peat free.
Ericaceous
Loam based
Seed compost
Potting compost
Multi purpose compost

Question 2

Describe seed sowing compost and how you would use it.

Answer 2

Fine, consistent texture with adequate aeration. Low or very slow release nutrients, mustn’t inhibit germination.
Use for sowing seeds.

Question 3

Describe potting compost and how you would use it.

Answer 3

Courser texture than seed compost. Higher levels of nutrients. Good moisture retention.
Used for potting on/up.

Question 4

Describe multi-purpose compost and how you would use it.

Answer 4

Intermediate between seed and potting.

Often with slow release fertilisers

Question 5

Describe loam based compost and how you would use it.

Answer 5

Where potting mix is needed for long term plantings. E.g. olive tree.
Less contraction in pot as OM breaks down.
Can stabilise top heavy container.

Question 6

Describe ericaceous compost and how you would use it.

Answer 6

Can be loam, peat or peat substitute base.

Used for calcifuges e.g. Camellia japonica.

Question 7

Describe peat free compost and how you would use it.

Answer 7

Might contain coir, Composted green waste, composted bark.
Used as an alternative to peat based composts.
Potting or multipurpose.

Question 8

What are the environmental implications of using peat in growing media.

Answer 8

It's not sustainable.
It's a natural resource.
It's a carbon sink.
It acts as a sponge to ease flooding.
It is a very particular habitat.

Question 9

How to make homemade composts:

Answer 9

Seed sowing:
1 part loam, 1 part leaf mould
Potting compost:
1 part loam, 1 part garden compost, 1 part leaf mould.
Long term growing Compost:
3 parts loam, 1 part manure, 1 part leaf mould