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Freedom I don’t know what variety you have. But blackberries grow on the second year cane. After the berries are harvested the second year, you cut out that cane as no blackberries will grow again on it. First year canes don’t produce fruit. Maybe this is a problem? Blackberries don’t like wet soil. Sandy with organic matter is fine. Is sand keeping them too wet? Also, they have a bunch of diseases they can get – plant looks fine – grows great but no fruit, or crumbly, other fruit problems. I fertilize mine with 1/4 cup of 8-8-8 fertilizer in spring per plant in a circle around the each plant. In high heat you have to keep them watered. That’s the best I can offer from what I know. HTH