I planted three blueberry bushes in the spring and did not get blossoms or fruit. What did I not do?
Blueberries are heavy phosphorous feeders and a lack of phosphorous will keep a plant from blooming and fruiting. Add some bone meal to the soil to add phosphorous and this should help.
How much cold weather can blueberry bushes survive in?
Blueberry cold hardiness varies among types and cultivars. Highbush, half-high, and lowbush blueberries are generally hardy to at least -20 F, although some cultivars are more tender.
Wild blue berries can handle extremely cold temperatures. Patriot is a cold
hardy variety.
I am a snowbird who lives summers in Massachusetts and late Oct to early May in Florida. Can I prune my blueberry bushes in mid Oct?
Here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/fruits/blueberries/blueberry-plant-pruning.htm
I have two containers, each with a different variety. We are one zone too cold here. I can put them inside where it doesn't get as cold, but no sun there. Will they winter? I can water occasionally.
Yes, they can be overwintered in a garage or similar unheated structure. You will need to water 1-2 times amonth while they are dormant, but no light is just fine.
Are bush blueberries effective with witches broom if planted near fir trees, and if so, how many feet away do they need to be?
This article will help:
https://www.gardeningknowhow.com/ornamental/trees/tgen/witches-broom-disease.htm
How far apart can you plant blueberry bushes and still get good pollination?
Blueberry plants can be planted as close as 2 1/2-3 feet apart.
What is the best fertilizer or food to use on 2 year old blueberry plants? They don't seem to be growing very much.
This article will help you with the fertilizing:
https://www.gardeningknowhow.com/edible/fruits/blueberries/blueberry-fertilizer.htm
But you may want to look at this as well as a source of this problem:
https://www.gardeningknowhow.com/edible/fruits/blueberries/lower-soil-ph-blueberries.htm