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When to replenish 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 and lemons? I'm reading that it is apparently is an overlooked mineral for blueberries, not sure about lemons. 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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