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The growing tips discoloration is usually a sign of overfert*, toghether with burnt tips. (*that simply means they have too much nutrients in the growing medium.)
What have then been feed?
Overfert is fixed by giving them just plain water for the next period or a light flush. (water 2-3 times more water than usually and allow it to drain and leech the nutrients out.)
you also need to fix the thrips problem. search for thrips and thrips eggs on the underside of the leaves, next to the white clusters. they are small, so have a 10x magnifier at hand. if you see signs of them, use the search box here at icmag for thrips remedies.
well if your plants is attacked by thrips dunno how well it will perform in flowering. at least you switched the lights to 12/12 yet if you waiting for flowering?
That's outdoor bro, only sunlight are recieving.. The environment is ok i think so.. But what about humidity and hoursof light i dont have the plans are in a friends house and im so happy that theyre still alive and with good health but thrips and overfert mmmmm i hopetohave my crop for december good christmas
its only thrips if the marking on the plants are not able to be wiped off or sprayed with water. it looks like ur foliar feeding? .. if ur not foliar feedin then it kinda look slike thrips but not really.
well, if they have no flowers at this time, it's almost guaranteed they'll not be ready by X-mas. especially with them having problems and beeing under low lighting conditions.
what temp are there if you say they're outdoor? ar you at the tropics?
^^^ I second that! Thrips leave jagged lines in the leaves and sometimes there's a silvery residue left behind ...a had thrips for the greater portion of 2011, got me some Monterrey and I haven't seen a thrips since!