Those aren't wild blackberries, they are the thornless variety. We have them and they get as big as your thumb. I think they are sour, maybe there are newer varieties that are sweet. We will have bunches of them in a few weeks. I prefer the black raspberries, they are just ripening. Nothing can beat black raspberry jelly. too bad I am diabetic. I haven't had any luck with the sugar-free pectin so far but will keep on trying.