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When to replenish calcium/gypsum for blueberries in containers?

Larry (Los Angeles, 10a, Sunset Zone 19)
6 years ago
last modified: 6 years ago

I have a few blueberries bushes in 15 gallon pots in Al's 5-1-1 mix. I added roughly 1 Tbsp of gypsum per gallon when planting since I'm unable to use the DynaGro fertilizer which has nitrate-based nitrogen that is harmful to blueberries. Other fertlizers I use such as MirAcid and Osmocote Plus don't contain any calcium. How important is calcium for blueberries? I'm reading that it is apparently is an overlooked mineral for blueberries. I have seen some members here use tomato fertilizer on their containerized blueberries because they typically contain a significant amount of calcium, maybe that could work better?

When do you replenish gypsum in your acid-loving fruit plants such as blueberries? At each replanting?

Any thoughts or suggestions are welcome

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