I am a complete novice and would like to know what to put on, as feed, to my large pot of raspberry canes( three canes in very large pot) as recommended buy the supplier last year.
I would give them a sprinkling of Fish Blood and Bone and water it well in at this time of year. Then I'd water them with diluted tomato feed once a month until the flowers have set fruit.
dovefromabove thanks for your advice
They like potash (potassium) which is good for fruit formation. Wood ash is a good source of this, provided it's been kept dry. Tomato feed has lots of it.
If you can possibly get them in the ground rather than a pot (however large) they'll do better, and have plenty of room then to throw up their suckers which will give you more canes in due course,
A good mulch of garden compost or straw would help as a soil improver and help retain moisture as well as suppressing weeds.