Thatoneguyyouknow_
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How fast did it appear? If it appeared slowly over a bit of time, yea treat for calcium deficiency.
If this happened rapidly over a day or two, its probably a calcium lockout. Probably caused by acidic turn in the root zone.
A calcium lockout though, generally youll see the serrated margins go black before spots will form in the body of the leaf. Itll also happen very rapidly.
Just giving a watering with a solution buffered up a bit is a better way to resolve a nutrient lockout then a flush. You know what PH the water you flushed was sitting at?
Agree with @Stokes I'd lean toward calcium deficiency over a calcium lockout personally. Although if using tap water, calcium deficiencies are very rare unless your PH is just going all wild from a hgihly acidic fert with no stabilizers or something. But you usually also see some other odd symptoms along side the calcium deficiency symptoms if PH is causing a lockout.
Keep in mind, calcium is an immobile nutrient, fixing the issue will not fix the visible damage on the old leaves, it will just prevent it on the new growth. Look to the new growth for evidence the issue has been resolved.
If this happened rapidly over a day or two, its probably a calcium lockout. Probably caused by acidic turn in the root zone.
A calcium lockout though, generally youll see the serrated margins go black before spots will form in the body of the leaf. Itll also happen very rapidly.
Just giving a watering with a solution buffered up a bit is a better way to resolve a nutrient lockout then a flush. You know what PH the water you flushed was sitting at?
Agree with @Stokes I'd lean toward calcium deficiency over a calcium lockout personally. Although if using tap water, calcium deficiencies are very rare unless your PH is just going all wild from a hgihly acidic fert with no stabilizers or something. But you usually also see some other odd symptoms along side the calcium deficiency symptoms if PH is causing a lockout.
Keep in mind, calcium is an immobile nutrient, fixing the issue will not fix the visible damage on the old leaves, it will just prevent it on the new growth. Look to the new growth for evidence the issue has been resolved.