Leaves turning white

it's overfed with something (with high ppm or directly to root zone) that caused lockout next time u feed it u 'd use more water or lower ur fert ratio

100% NOT cal/mag related. Looks to me like an iron deficiency. A dose or three of a soluble trace mineral mix, available from any decent garden centre, should solve this. Nutrient burning would affect most of the leaves, not just a random few.

Its immobile in nature, Iron toxicity can cause white bleaching on leaves, particularly in the younger leaves, where it can lead to interveinal chlorosis and even complete bleaching of the leaf tissue. Iron deficiency can also cause similar symptoms. This can be confusing as both deficiency and toxicity can lead to similar visual symptoms, but toxicity is more likely to cause the entire leaf to bleach white. gluck.

What an idiot below .... calmag, really ???? Heavy burn. Reason could be intense light, too low ph in recent watering or nute burn. You know what chaged recently, backtrack your actions.

Hello gromie so this is a classic example of a calmag deficiency just give her some more calmag and you will be golden gromie👍👌