That is not typical of nute burn. Nute burn usually hits the tips of the leaves ffirst, and the leaves are usually much darker and get a "claw" curl to them.
My first guess would be a potassium deficiency, but you don't appear to be in flower, which is usually when P and K deficiencies show up. However you could have a pH issue causing lockout of K(potassium).
What soil/medium are you in? what and how often do you feed them?(please don't say Miracle Grow) Do you check the pH of the water and or medium? What do you use to check pH?
The answers to these will tell us a lot
What is wrong with Miracle Grow fertilizer is that it is not formulated for MJ. Different plants have different needs. If you look at the garden stores you will see certain brands of ferts for Roses, or Azaleas. There are ferts for tomatoes, ferts for fruiting trees and shrubs, ferts for house plants. Generally plants can be grouped to match those with certain nutrient needs, and then buy that particular nutrient brand that "best" serves them. Miracle Grow is a general purpose "high potency" plant food that has been formulated to cover the needs of general bedding plants and annuals.
Marijuana is an animal all its own. It is not a "weed" or a bedding plant, or even a flower. It is more like a cross between a specialized Herb and a high energy fruiting plant like berry producing plants such as Blueberries. This uniqueness of this plant is what makes it such a difficult plant to grow by those who think they are growing a "house plant" or flower. MJ is a very "need specific" plant, and while some people can get away with growing it in less than ideal conditions or nutrients, it is best for getting the best results to use those things that MJ specifically wants.
That said, I wouldn't use MG nutrients at all for my MJ grows, but it is great on bedding plants and general flowers. Marigolds go bananas, and will nearly grow into shrubs when using MG nutes on them.
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