hey could anyone tell me what can cause the leaves to dry up on the ends. check the pic.

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looks like heat stress, how close are lights to those leaves, what is you temperature?? how many and what kind of lights are u using? what type of soil, etc... if you give us all this info we could better help you diagnose the problem, peace!

either heat stress or nute burn more info will help

im using 2 125 watt cfls about 2 inches from the top of the plants. im using biobizz all mix soil with bio bizz veg,bloom and topmax. i give them nutes every other watering. i have stopped giving this plant nutes as i thought it was nute burn shall i just wait and see if it clears up? my temp in the tent is 22 degrees celceus.

yes i would stop nutes, flush with plain water (enough water for it to run out of the holes in the bottom of the pot). then let the pot dry for a few days. what is your soil ph, if you don't have a ph meter go buy one, they are very cheap, anywhere from five to ten U.S. dollars. let the plant dry out until the top two to three inches of soil are dry (soil moisture meter five to ten bucks too). then i would flush one more time with plain water three to four days after soil dries out. looks like nute burn, plants look a little small to be giving nutes too soon. my plants are in foxfarm soil, haven't given nutes yet, they are green and healthy, about two feet tall and bushy, just use plain tap water that has been sitting out in opent for 34-48 hours of longer. what type of water are u using, tap or bottled? the ph of the water can screw up plants also, so a synopsis after the rambling message, buy a ph and moisture meter, stop nutes, flush twice and let them heal, peace

yea i use tap water leave it for about 3 days then i water. thanks for the info i'll go buy a ph meter tomorrow.

also should i cut the dry leaves of the plants or just keep them on there. im currently in the middle of flushing them through with just water?

i say heat stress

how can it be heat stress? im using cfl that give off hardly any heat and the temp in the tent varies from 18 to 24 degrees and i have fans running 24/7

did the plant grow into the light? if the cfl touches the leaves it will burn it, it happened to me. a good test is put your hand between the lights and the plants, if your hand feels warm then back the lights up a bit. did you flush the plant? could be nute burn also, especially if your soil medium has nutes in it also. any updates?