No I don’t, after they fruit I fertilize them monthly like I do almost all my plants except trees.
I guess they will grow leaves and not much fruit if fertilized beforehand. That is what I heard, but never really tested them. Some compost might be good and it is so light on nitrogen it should not do this. I heard this about raspberries too, but I have found they do poorly without food. But it may be my local conditions? I don’t know? Feed them very well in the fall (strawberries) and they should have plenty to grow well till after fruiting the next spring. I cover mine and many stay green all winter even here. Sometimes when not covered well the leaves die yet they come back, should probably fertilize these.
Blueberries really differ cultivar to cultivar, and they are not tremendous growers either. I still sometimes only get a couple canes to grow too. With mine I think it’s the pH is not right. they need it at about 5.0. If not there, too high or too low, they fail to grow well.
I had a Toro that was eaten by my dog, only one cane remained. It took 2-3 years to fruit, and it soon died after it did. I like the berries so much I bought another one and it is growing like a weed. Completely different than my first Toro. Producing and growing better. Dumb luck sometimes! Once compromised they seem to take forever to recover.
The Toro is the sweetest blueberry i ever had, almost pure sugar. But, and a big BUT, is that it is so soft it’s almost mushy. Still I like the sweetness a lot!
The best tasting one for me is Cara’s Choice, it is a compact medium vigor, medium production plant. The berries are very good with a complex flavor. I never had a sweetcrisp, it just refuses to grow here. I would at least like a few flowers so I can cross it with Cara’s Choice. maybe the offspring will grow here? Legacy is a tremendous grower i should probably cross with that too. I highly recommend Legacy. Still too young is Spartan, Ka-Bluey, Pink Popcorn, and Razz. I will report on them with time. I really like blueberries, if I had room, i would add many many more.