Ask a Question forum→Citric Acid in Hydroponics

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Name: Kara
California
karahenschel
May 4, 2020 10:50 AM CST
We just ordered a new Hydroponic tower. It comes with a two part mineral blend, citric acid/magnesium sulphate for lowering ph. Our family does NOT eat any food with citric acid as an additive (if added to canned tomatoes, for ex). Would the citric acid in the mineral blend find its way in untouched form into the plants we are growing? Thank you!
Name: sumire
Reno, Nevada (Zone 6a)
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sumire
May 4, 2020 4:09 PM CST
The citric acid is used to buffer the system or manage the pH so that plants grow effectively. A pH too high or too low, and the plants cannot absorb nutrients. The plants would be exposed to the citric acid (because their roots are in the water) but it does not make the plants more acidic. I would not consider the citric acid to be "in" the plants. But if you have a pressing reason to avoid exposure to citric acid I would be a little concerned.
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Name: Baja
Baja California (Zone 11b)
Cactus and Succulents Seed Starter Foliage Fan Xeriscape Container Gardener Hummingbirder
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Baja_Costero
May 4, 2020 4:34 PM CST
Yes, I think it's fine. You can use other acid buffers for hydroponics if you prefer to avoid the citric acid. I use one called "Acid Buffer" (Seachem brand) which is Ca/Mg bisulfate, in combination with a drop test for pH.

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