I planted two blueberry bushes 3 years ago. The first year I didn't expect anything because I planted them in mid summer. The next year there were a few berries but I figured that was because it hadn't been a full year yet.

Well, this year there were even fewer berries and the bushes haven't grown at all since I planted them.

I have blackberries and rasberries in the same area and those are thriving. Do blueberries need something special that's different from other berry plants?

Thanks for any help.

Water and correct pH are the other pillars that build a big blueberry plant. The OP could also have issues with too little water. His pH is probably OK based on lack of chlorotic leaves.

Any new or little plant growing next to a big tree needs extra care, as in extra water and fertilizer, to grow well. The big tree usually has massive roots that suck up everything needed to grow.

I was wondering how the Holly Tone fert for acid loving plants would work that I can buy at Lowes?
I have Southern States Coop and Lowes in my town. Neither sell the Jacks Classic fert but southern states sells ammonium sulfate.

Where I've burned plants with ammonium sulfate is applying it dry at excessive rates and watering in. That can fry the roots.

PS: A teaspoon is 5 ml. So rates above are 2 ml per gallon vs 1 ml per gallon.

I won't go that strong now but maybe have turned too conservative. I haven't gotten that growth rate since.

My mistake in the experiment linked below was quitting N application cold turkey in late summer. The pictured plants weren't fertilized August until April. As a result plants aren't leafed out like they should be the following spring but size was there. Now I fertilize pots about once a month for maintenance.

An as was said, they are serious nitrogen users!