"Helping" natural blackberry bushes

[goodolpete]

Our allotment, behind a locked gate, has a great blackberry patch.
I've been picking hidden areas of it for a couple of years now, with
no evidence that any other pickers have worked them, and the berries
have been large and sweet.
Have any forum members "helped" such patches and if so, how?
Do you throw handfulls of growmore over them or what?
Pete

[flynch]

Helping blackberries

Wild blackberries are very hardy and shouldn't need much input. If they develop and problems some fertilizer can't hurt.

In summer I'd prune out the growing tips on New canes to get higher yields next year. I have both a wild patch and cultivated and the increased production from that one pruning cut in July is incredible