I have five Top Hat blueberry plants all in separate pots. (very large pots). Two plants are ones I purchased last year. Three are new I purchased this spring. The three I purchased this spring are doing great with new growth, and leaves. but they are now showing little brown spots on some of the leaves. The two from last years are not showing as much or very little new growth. I do keep the weeds out of the pots. I water them every other watering with a fertilizer for acid loving plants. I have not yet put the news paper or mulch around them as I have read on here.
How useful are ground egg shells to add calcium? Or coffee grounds. I use the eggshells with my tomatoes and have had great success. I have not tried the coffee grounds yet but have see on TV and read they work great for raising the acid levels in the soil.
Any suggestion would be greatly appreciated.