Maybe only with gardening and politics could you get this many people to listen to talk about fertilizer. There are more follow-ups to these talks about blueberries than any other topics on hear. After reading some of it, I got interested and googled for more stuff about it. I go to a local garden center to buy plants and stuff most of the time instead of the big chains. Even though the prices are sometimes higher the people are lots more helpful. Now I am confused because what I found in science articles about on the internet is the opposite of what everybody at the garden center told me. They always told me to give nitrogen for more leaves and phosphorus for more roots. I asked if the potash was for more more fruit or vegetables but they said not it meant potassium and never said how to tell if your plants want more. My doctor used to tell me when he gave me prescriptions diuretics for PMS that if I graved bananas, I needed more potassium. Since I can't tell if my plants have banana cravings, how do you tell if they need more potash or potasium? From what I can find on the internet it sounds like the stuff about phosphorus and roots is a old wifes tale and not really correct. I tried that google scholar thing that somebody mentioned to find science stuff about it instead of just people talking. Every real science kind of thing I can find on internet seems to say that most dirt except sand has all the phosphorus that plants needs. For real science stuff about nitrogen I found only found things saying it caused tomatos and stuff to only make leaves and have problems. Unless the plant is yellow it seems to say its more bad than good. Except for farmers that take everything out of the dirt by growing same things everyyear, it says that regular people don't really need to add much except for pots where watering washes everything away. I tried to find the thing that somebody said Cornel said about nitrogen keeping trees alive but google only pointed be back to this follow-ups. How can you really tell whats best for blueberries except for acid soil? Is this thing about all the men on here wanting to pee on everything because they are still marking turf like boy dogs? After you men pee on your blue berry bushes do all the dogs in the neighborhood come by to raise their leg on them too? I think I will use vinegar.

I haven't used Hollytone but many people do successfully. It's a lot safer than ammonium sulfate. The later is safe if dissolved first at a modest concentration. I got my fastest growth in pots by mixing 1 teaspoon per 2.5 gallons and applying once a week. In ground once a month should do. Small frequent doses are much safer than one large shot. Right now I'm mixing 1 ml per gallon which is, I think, a fair amount less than rate above. 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. This post was edited by fruitnut on Wed, Jul 30, 14 at 12:00

No chance of harvest off those flowers in zone 6. Even in my greenhouse anything flowering now won't ripen until winter or early spring. They can flower due to pruning, change in weather, etc. So your change in watering may have had some effect. The time interval doesn't seem enough. So they may have flowered without that. Usually it's a small fraction of total bloom, 1-5%. So next springs bloom shouldn't be affected.

I set out 15 blueberry plants about 5-6 years ago in the same bed. The bed is in full fun, from north to south, two rows of 7 and 8 plants. The bed has a gentle slop from south to north. The spacing is 4.5' between plants and 5' between rows. When I planted them, I mixed with 50% peat moss and 50% existing soil. I did not put on any sulfur. I have not tested the PH for a long time. I mulched the bed with about 1"-2" of composted wood chips. The 5 plants in the south size (the high ground) did really well and they are about 5' tall, putting out good berries for at least 3 years. But two plants died, one Rubel and one Elliot. At first, I thought drainage is to blame since the plants in high ground did extremely well. But the Northland and Brigitta are in the middle of the rows. The Polaris is the 2nd plant from the south and it has not grown much at all. The bed is not water clogged. So I decided to replant the slow growing ones to another location. When I replanted them today, I mixed with 50/50 peat moss/soil and add 1-2 cups of sulfur and a cup of bone meal in each hole. I hope this will somehow make the PH lower and make the plants happier.