Your blueberry plants are still quite young. I read that it's best not to let them flower/fruit in the first year - so that the plants can establish strong roots and support more fruits in the later years.

I'm new to growing blueberries as well. I have about 14 blueberry plants growing in pots and I'll be adding a few more different varieties to my blueberry collection.

My Sunshine Blues are growing a bunch of flower buds and I'm not sure why they're doing it - since it's late Autumn in Australia at the moment. I pulled off all the flower buds and hopefully they'll grow new shoots in spring.

What kind of soil did you put into the pots with the plants?

For mine I used a 80% peat moss, 20% garden soil and some of the Dr Earth acid lovers mix. This was the advise I received at a local Master Gardeners seminar on berries. I put pine needles on top as well but mostly because I have them and to help retain water.

I don't believe that your soil pH will go down much (or at all) with used coffee grounds. From what I have read the ph of UCG can vary a good bit and at best it's only slightly acidic. It can be good for adding organic material to your soil.

All that being said this is my first year growing blueberries. I am learning a lot with my two varieties but by no means am a pro. :)

Thanks for the advice. I used Miracle Gro moisture control potting mix with some added perlite for better drainage. Thanks for the info on the coffee grounds. I vaguely remember being told to add them to the soil if I wanted a blue hydrangea, and since they change color based on pH, I assumed that meant it would make the soil slightly more acidic. However, I don't even really remember who told me that, so it may not have been a very reputable source. What kind of fertilizer do you use? People on the citrus forum recommended foliage pro for my meyer lemon, so that's what I have on hand. Will that be good for blueberries, too, or should I look for something different?

Plants in general are kind of a new hobby. I started last year when a friend bought me a serissa cutting from a bonsai booth at a craft show. A year later, it's still alive and well and has grown quite a bit, thanks to the advice of some very helpful people on a bonsai forum. Then a few days ago, I saw a meyer lemon tree at a nursery and in a moment of insanity decided I had to have it. And then came the three blueberry plants. All that to say I'm not entirely sure what I'm doing, but a bonsai forum helped me not kill my first little tree, so hopefully I'll learn a bit about my new plants on this forum and not fail too spectacularly at keeping them.

Plants are a fun hobby! However it can be an addicting hobby so beware. :D Also most people in the citrus forum are enablers. :) I couldn't find anything online about the PH of the miracle grow moisture control but blueberries like soil between 4.5 and 5.5. Most of my plants are in ground but my two blueberries raspberry, key lime and kiwi are in pots. I have been using osmocote plus for the container stuff and am considering trying something like foliage pro but I am sure my wife already thinks I have way too many fertilizers.

Thanks for the advice. Should I add vinegar to the water while watering? I see the addiction. Yesterday at home depot they had a variegated pink lemon and I was incredibly tempted. But I will be moving, so I really don't need more plants. In all honesty, I probably shouldn't have bought the ones I have now, but they were impulse buys and I figure moving a handful of plants is doable. Just as long as I don't get more.

I am starting to add vinegar for my blueberries because my tap water is 7.9-8.2 range. That information is from the water quality report from my water company. Most water districts post a water quality report which has a range of different things in your water. I'll also use rainwater when we get some in the barrel. I would check to see your average water ph through your local water company before just adding vinegar.

Thanks for all the advice. I will look for a different fertilizer. I had no idea there were so may different fertilizers for different plants! Also really interesting bit of info about the hydrangeas. I always thought it was just the pH that made them bloom blue.

I've never grown blueberries in a container but we were always told to use some type of meal from the local feed store as fertilizer as it breaks down naturally over time when the plant needs it as opposed to something out of a bottle. Cottonseed meal, fish meal, soybean etc. Then sulfur to increase acidity.