Last year when I started my permaculture garden I pulled out an invasive blackberry push that was the best producer out of the others on the property. It had a deep root and had been there for years.
I planted new plants in the same spot including a raspberry bush from Walmart right where the root of the blackberry bush used to be. What I found was that the raspberry bush did not fruit at all last year, it put on maybe a foot or two of growth but had no berries.
I've been referring to
Deep Green Permaculture''s Companion Planting Table and it says that blackberry is not a good companion to raspberry.
Did the blackberry bush do something to the soil that would cause the raspberry bush to not fruit? I'm pretty sure I planted a self pollinating variety of raspberry.
Is it advisable to not plan to put a plant where an antagonist species once was? All the other plants I put in around it did fine for their first year, blueberries, parsley and radishes.