A late 'summer pudding'- just use your blackberries and perhaps some damsons withredcurrants and strawberries or any other soft fruit you can lay your hands on... cook them gently in some fuit jelly and ( stir it slowly to dissolve the jelly) use as a sauce with ice cream. Or make a bread and butter pudding and put a layer of the blackberries and some cinnamon underneath, brown sugar and cinnamon on top...or left over croissants/brioche broken into chunky pieces stirred ip with some brown sugar,cinnamon and the blackberries, pour over a mixture of whole milk/cream and beaten eggs, sprinkle with cinnamon, sugar and a few dots of butter...apple and blackberry crumble...make a frangipani paste, put a layer of the blackberries on the bottom of a tart dish, sprinkle with sugar, put the frangipani on top, pressing it down so the berries stick into it, cook....they freeze brilliantly so no need to use them all at once.

I did that very thing two years ago Joanna,put one in a tiny space beside the drive where not much else will grow ,got a wonderful crop this year, find one that tastes really good and root a shoot from it.