Blackberries Not Fully Developing

Question

Every year, My blackberry bushes flower but the the fruits are just three tiny pin size green balls and they stay that way. Is there anything I can do? The red currents and raspberries ext to them are fine.

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Answer 1

This is a complex subject, and will be fungal or bacteria. Some of these will attack, only, certain species of blackberries. This article will explain:

https://www.gardeningknowhow.com/edible/fruits/blackberries/blackberries-not-fruiting.htm

This may require assistance from your local extension service.

Here is a link that will help you to find the closest one to you:

https://www.gardeningknowhow.com/extension-search