OK - Planted against an East facing block wall. First mistake - no access to the back. They should be planted with enough space to be able to access from both sides. And also hopefully to prevent roots migrating to adjoining property. So anyway they get full morning and high noon sun. Since they are over six feet tall the tops gets full sun all day. I have never fed them anything. They are on timed water that we vary according to needs of other plants on that grid. So you can see we don't cater to the blackberries. Usually trim out in the Fall the branches that had fruit that year - you can tell, they are "older" looking and not so green. But neglected badly last year. So a really wild mess.
