Recently found amongst gardener Jack's papers:

• Essential for good roots: phosphates (bonemeal, hoof and horn) oh - and superphosphate of lime.
• Fruiting and flowering: potash (chemical, or wood-ash, though this will contain lime).
• Green growth: nitrogen (dried blood, chemical, or fixed by legumes)

Blood, fish and bone is good all round fertilizer for slow-release plant food.

For:

Flowers choose a fertilizer with high K

Root crops choose a fertilizer with high P

Green growth choose a fertilizer with high N

Jack with daughter Jenny in 1956.