Long time outdoor, in the ground grower. Due to septoria, I decided to try 20 gallon container growing with Promix BX and using 1/2 teaspoon of Maxibloom per gallon for nutrients. They receive nutrients at every watering. So far there's no septoria on the container plants, but it's been a dry/hot year. Recently rains seem to have brought septoria to plants in the ground.
With the Deep Purple plants starting to flower, the fan leaves are yellowing from top to bottom, many of which have already been removed - need the airflow anyway. There are also spots on the leaves which I'm not familiar with. The other strains aren't exhibiting the same ailments.
Is it perhaps over watering, nutrient burn/lockout or inadequate nutrients? Should plain water be used periodically to prevent buildup?
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