I have 3 blueberry bushes in 5 gallon pots with wood chip mulch that are doing great and blooming pretty heavily right now but I've heard they like acidic soil.
Should I be adding coffee grounds, or pine mulch on top of these or using an acidic fert?
thanks,
Kris, I use a mixture of all three on my blue berries (potted and in ground):
(1) Amend soil with sulfur and peat moss;
(2) mulch with pine-needles.
(3) Use Azalea fertilizer or cottonseed when I have it
(4) Measure from time to time with a good pH meter.
BTW, I've read that coffee-grinds only lower the soil pH (or is it acidity) temporarily, but maybe that's just because worms break it down into neutral castings. It could also be the carbon sequestering ions, etc.
Your biggest challenge will probably be keeping the birds and other critters off the crop. I'd like to snack on the berries off the shrubs over time, but that just gives them more time to assail the harvest. Same goes for peaches!!!