Ideally obtain and grow the sterile “Bocking 14” strain.
Steeping method. Fill container (ideally with a tap) with comfrey leaves and apply a weight. Wait 3-4 weeks and it will start to drip. Collect concentrate and dilute to the colour of tea (1 in 10) to use as a liquid feed. Add more leaves as the level falls in the container (a smelly process).
Comfrey is high in Potash for flowering and fruiting plants; (N 0.74 P 0.24 K 1.19%); Nettle is high in Nitrogen to promote growth in plants; Mix the two at the making stage or mix concentrates for a general feed; Both contain trace elements; When finished, empty onto the compost heap and cover (smell).