Brown spots on larger/older fan leaves

Trying to discover the source of this problem. i have 4 plants outdoors in soil (two Jack Herer and two Glue Gelato), and this is only affecting the JHs. i feed them a 50% solution of the FF magic elixir twice a week, and bone meal/Terpinator on an off day if the soil drys out. If it is a wet week, I skip the supplemental feeding.

This is only affecting the larger/older fan leaves at present; it was time for some light defoliation so I clipped them all off this morning. I inspected for insects and found none, and the fact the other 2 plants are not having the same problem leads me to believe it is not bugs. Just as a precaution though, they’ll get a moderate misting of Neem after sundown tonight, followed by a light misting of water just before dawn tomorrow. It’s been raining here for a couple days, so need to let them dry out a bit; probably no water/feeding for them tomorrow. I try to let the soil dry out for at least a day before I feed/water.

Since I’m already giving them bone meal, I doubt it is a calcium deficiency even though the attached chart seems to indicate it might be that. I’m hoping that since these are older leaves, they are suffering as the plants start sending more energy and nutrients to the swelling bud sites, all of which are surrounded by healthy sugar leaves.

Any advice/comments would be warmly welcomed.

slainte,

Mitch

Bone meal takes a long time to be available to plant. Its Its something that should be in soil well in advance and not something you supplement imo

bam0813 said:

Bone meal takes a long time to be available to plant. Its Its something that should be in soil well in advance and not something you supplement imo

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Thanks - they’ve been getting bone meal since young, and the soil is a mix of FF Ocean Forrest/Happy Frog/Light Warrior, Big Roots and Promix. I’ll have to dig a bit deeper to see what calcium this combo provides without any supplementation.