Crunchy marijuana leaves

A question from a fellow grower:

I’m growing some plants outdoor they are 2 months and a week old bubba kush plants well one day i noticed one with curling up leaves and yellow spots and the next day the leaves were crunchy and dry now a couple days later i seen two more plants having the same symptoms what can i do to safe them? what is causing this problem?

Most likely this is caused by nutrient salt build up. Kinda nutrient burn. You could try flushing with r/o or distilled water. You could also try adding a flushing agent to the water flush. You can find these flushing agents at specialty garden stores or online pretty easy.