David,
The canes have been there for quite a few years (10-12?) so I suppose they
are getting old. Perhaps I will tip root one of the canes this year and put
it in a different part of the garden.
I usually feed the bush in spring with growmore - but one thing which may
not help is the fact that it is growing in grass so this may be taking the
feed away before it gets to the roots of the bush.

Thanks for your reply,
Paul

"David Hill" wrote in message
...
This looks a lot like old age. The plant taking from the old canes to make
good healthy growth for next year.
Do you feed your Blackberries?
We used to give a high Nitrogen feed early spring followed by a high
potash
feed July /Aug.

--
David Hill
Abacus nurseries
www.abacus-nurseries.co.uk