4x Haze in a 4x4

foliar sprays do more for human psyches than actually aid the plant in any way... if you need foliar sprays tosupplement fertilization, that means your fertilization is off. it's a tool for specific problems, yes, but to use in general invites more risk than benefits. now, something like a neem application to preemptively avoid a problem is a different thing. You shouldn't need vitamins or other stuff in a general foliar spray... it should get all it needs at far as nutrients from the roots, preferably.

It's most likely a pigment mutation but your ppm is a little on the aggressive end. Although the other plants are fine doesn't mean this pheno is going to respond the same way to the same growing conditions. I recommend just lowering your feed about 100 ppm to see if anything changes. This should give you a good idea if it's a mutation or an excess of nutrients. Hope this helps

The autumn colors are from cooler temperatures at night and/or genetics. Looks liek thy are also paling from tip-in .. if this is also progressing up the plant, it's needing more nitrogen. unlike what often gets repeated ad nauseum, a flowering plant most definitely needs nitrogen at nearly the same levels as in vege phase. if you want your plant to turn yellow, stick to teh culturally-constructed nonsense that's never once been supported with evidence :P