Maybe some fertilizer would help you should do it in the fall but it can't hurt them. I make compost tea. You have rabbit berries that's even better. I take compost and put it in a old stocking then I put that in a 5 gallon bucket filled with water.. I soak overnight. I have a old pump from an aquarium I put the hose from the pump in the bucket too. Oh, I also add molasses. I turn the pump on and the next day I give each plant a ladle full and water them. It works so good my neighbor asked what do I do. She wanted her yard to look like mine.
With the rabbit berries you can add them straight on the soil.
Love that, Pam. I do keep a deep wheel barrow of spent bunny hay. I have been putting it in all my gardens but your "tea" sounds wonderful.