Loganberries

Question

I have 6/7 loganberries planted on a 4ft sunny wall and growing very well for about 3 years. They produce an abundance of small white flowers but not one fruit since planted. I have no problem with raspberries.
Thank you.

Answer 1

This article is about Blackberries, but the information applies to Loganberries also.
There can be a few reasons for lack of fruit.
https://www.gardeningknowhow.com/edible/fruits/blackberries/blackberries-not-fruiting.htm