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In the spring when the buds are opening and again in the fall after harvest. Be careful, fertilizer can harm Blueberries that are not well established.
I don't use a commercial fertilizer on mine, just compost twice a year.
Thanks so much for the helpful information. I think it is too late to fertilize now...I will have to wait until fall. I hope I have a lot of berries (if the birds don't get them).