We planted blackberries three years ago and have yet to see any fruit, It appears that they are going to produce with little green fruit but it never goes past that, All we get is higher and higher canes with leaves but little to no fruit. Should we give up after three years and take them out of where we have them planted or can they recover somehow?
Growing Producing Blackberries
Certified GKH Gardening Expert
Are there any other symptoms that you can see? It could be that the soil is lacking fertilizer.
Alternatively if the growth that is on it is a real dark, and lush green, but no fruit then this could be a sign that there is too much nitrogen in the soil. This can be fixed by adding phosphorus and potassium to the soil, or simply raising the pH just a little with some dolomitic lime.
Here is an article that will help: https://www.gardeningknowhow.com/edible/fruits/blackberries/growing-blackberry-bushes.htm