Do transplanted blackberries bloom the first year? The plants are 4-5 years old.
The white on the plants is Seven Dust, to treat the Japanese beetles.
Certified GKH Gardening Expert
Blackberry plants do not fruit the same year they are planted. Primocanes appear in the first year and remain into the second year when they become floricanes, which produce flowers and fruit.
This article will help you with Japanese Beetle issues.