I have been using seaweed exract as a feed with with my usall feed this year and so has my friend, and we have both had good results with it. I have a blue berry bush(or should I say twigg), bought in wilkinson a few years ago. I have had about 6-12 berriees off it each year, and no sign of new growth this year till about a week ago and now it is romping away with nice healthy looking shoots.
The only product I have bought on the gardening hours (for the OH) that has been a total sucess is Flower power my OH loves the stuff !.
That is really late. I bought a couple of Blueberry bushes from Ideal World three years ago. The first year there were no fruits but from year two I had new growth from March/April and a reasonable amount of fruit. They are two different varieties in square pots with ericaceous compost next to each other. The first variety fruits earlier and has sharper berries. The second is just finishing fruiting.
This year I had 4 or 5 good size dessert bowls of fruit plus a lot went to the birds or dropped off. I broke off half of one of the bushes last year with the hose pipe. I am sure if they were in a less crowded and safer position I would have had even more fruit
I top the soil up with ericaceous compost each year and feed with seaweed extract and this year RJs Flower Power as well
Work colleagues have reported similar poor fruiting. I think the secret is to have the two bushes!
Stuart