I've had a blackberry plant for about 4 years, I think this is its 4th summer here. Anyway, it doesn't typically produce that well, although I noticed every year it matures, it does produce more flowers. This year its just covered in flowers, I would love to have some blackberries this year, but I've noticed absolutely *no* pollinators on the flowers. Anyone have experience in pollinating them yourself? Is it enough to use an electric toothbrush on them? Or something else? Any advice would be appreciated. My daughter waits for them every year, and the 5 or 6 edible berries we get hardly makes the space it takes in our garden worthwhile. I'll include some pictures in case that helps. Thank you for any suggestions.