John
Innes Potting Compost
JI #1 Base
- 7 parts sterilized loam
- 3 parts peat
- 2 parts sand or grit
- Fertilizer: 4 oz / 8 gallons (3 grams / liter)
- Lime or chalk: 3/4 oz / 8 gallons ( 0.5 grams
/ liter)
JI #2 Base: Same as 1 but double the Fertilizer
and chalk
JI #3 Base: Same as 1 but triple the Fertilizer
and chalk
JI Seed compost: The fresher
the sterilization, the better the germination
- 2 parts sterilized loam
- 1 part moss peat
- 1 part sharp sand
The loam and peat is put through
in 3/8 in (9mm) sieve.
To each bushel or 8gal(36 L) is added:
- 1-2 oz (42gm) superphosphate
- 1/2 oz Potassium nitrate
- 4-6 oz (21gm) ground limestone
Ericaceous Mix: Use the base
but leave out the Lime
Soilless: 3 parts peat and
1 part sand
Potting Compost: (same as above)
- 7 parts sterilized loam
- 3 parts moss peat
- 2 parts sharp sand
The loam and peat is put through
a 3/8 in (9mm) sieve.
To each bushel (8gal/36l) is added
- 3/4oz (21gm) ground limestone
- 4oz (110gm) 14-14-14 Osmocote
This makes John Innes Potting Compost
No. 1.
For a richer mix simply double the quantity of
John Innes Base to make No. 2 or treble it to
make No.3
