WHEN TO SOW
March and April. Also can be sown early Autumn
WHERE TO SOW
In trays or pots in a cold frame or greenhouse.  In the second year the comfrey will really starts to pay off. In the spring it will vigorously grow back. Your first cut can be used to get potatoes off to a good start. After that you should get at least a further three to four cuts.  To get further plants you can divide plant up and take 2 inch root cuttings and away you go again. Be careful as the bits left over will happily root wherever they fall.
WHEN TO TRANSPLANT
Thin out seedlings as they grow to 5cm apart. When plants are about 15cm tall transplant outside spacing 60cm apart.
MATURITY
Comfrey is a perennial plant and leaves will ready for use from the following May.
TIPS
Raising Comfrey from seed is very difficult and germination is slow and erratic. It will tolerate most soils and conditions but prefers a moist or moisture retaining loam in an open sunny site.  The srems can be blanched in the same way you would coook asparagus, and the young leaves can be choppped into salads or cooked as spinach.
HANDY TIP
Comfrey leaves are reputed to make a high potash fertilizer. Simply cut the leaves before the plants flower, make sure you wear gloves to avoid skin irritation and allow the leaves to wilt overnight as it makes them easier to handle.
Place the leaves into a large bin and cover with water. Although the smell is awful, it is one of the best, so clamp down the lid and bear with it. It isn't easy to stir a full bin of Comfrey, escpecially when there is a lot of rigid stems, so we suggest you use a stout pole and simply press the lot up and down.
Comfrey based feed can be used on small plants once duiluted and is excellent for use on Tomatoes, Onions, Strawberries, Melon and Peas. A late cut of Comfrey in the autumn will make a brew to last through the winter. Happy brewing!