How to Fertilize blackberry?
Apply a balanced fertilizer monthly during the growing season.

blackberry · Rubus fruticosus
Also known as: bramble; bumble-kites; common blackberry; common bramble
Can be fan-trained to provide fruit, but more suited to a wildlife garden. Tolerates most soils and situations, but need sun to flower and fruit well. May have the potential to become a nuisance if not managed well. See also blackberry cultivation for more advice
Apply a balanced fertilizer monthly during the growing season.