Hi Guys,
I'm new to the forum and new to growing, I have 3 plants growing in soil on the terrace. All 3 plants have leaves with brown necrotic spots on their leaves. Not all leaves are affected but those that are can be older, lower leaves or newer growth. I am growing in Biobizz light mix, and have been very sparing in adding nutrients: every other watering I've added 1-2 ml per litre of Biobizz grow and added Biobizz root juice when they were seedlings. The plants are autoflowering and just entering week 6. Flowers are just beginning to form. I can't see any pests although a couple of weeks ago I thought I might have spider mites, I sprayed leaves with mixture of alcohol & water and also used Potassium soap. I can't see any signs of insects now. Could this be due to calcium lockout or calcium/magnesium deficiency? I did flush the plants with PH'ed water a couple of days ago. Should I use a calcium magnesium supplement?
I would really be grateful for any expert advice,
Thanks,
Chimsha
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