What have i done wrong?

okay so i got given some seed from a mate i dont think its anything special and i propagated it in rock wool, and then transplanted it into coco coir, perlite mix. they are inside under 60 watts of cfl for now but i will be moving them outside when they get bigger they are about a month old and i just keep seaming to screw them up my plant last year was beautiful and healthy before someone stole it. on these ones the leaves started curling so i thought i might be giving them too many nutes so i stopped that and fed them epsom salts and also spraying the leafs with it and they have purple stems and white stuff on them now they are looking terrible. any help would be great.

purple stems could be a nute lockout are u spraying the leaves with epsom salts that white could be residue left from the water drying and traces of the epsom salt being left behind or it could be powdery mildew

yeah there is a brown patch on the on one of the leaves and they are all yellowing starting from the bottom any idea what that is?

do u know the ph im not to versed in coco coir how well does it hold nutes cause that sounds like a deficiency of nitrogen or a lock out

first thing.... is the coco BUFFERED? If not that's were your calcium and magnesium are going. the coco is sucking it all up as it naturally bonds with the two. Also coco is rich in natural potassium, so if your fertilizer that u give them doesn't have a lower K then you are over supplying K and that caused an increased demand and uptake of ca/mg. coco is great if you can work out the kinks associated with it. it has a near perfect natural PH 5.0-6.5 and it is for that reason considered a HYDROPONIC MEDIA and the fertilizer and PH of the fertilizer needs to reflect that of HYDRO. Optimal PH is 5.8 but coco is very forgiving just like soil. U said its a mix of just coco and perlite both hydroponic media. Are you using any organics? that can cause the PH to go a tad wacky if you are fixed on a certain range. The purple stems are most likely a magnesium deficiency, but some strains are genetically prone to purple peptols. mag is mobile meaning it can travel thru the plant and be taken in from the leaves as well. cal is immobile and has to be taken thru the roots, so If you are seeing a mag deficiency then the cal is not to far behind and will take from the older leaves first. Your plant is basically feeding off itself. a foliar spray of calcium nitrate (only form of calcium I foliar) and mono potassium phosphate with Epsom salts will fix you up temporarily. N-P-K-Ca-Mg-S complete primary and secondary nutrient foliar.

1 last thing about spraying plants. you must always remove any residual minerals from the leaves. if you keep on day after day spraying your plants without spraying inbetween with water you will choke out the stomata and the plants transpiration will stop. I just studied your pictures and it looks like you are overwatering because the top leaves are droopy. coco needs to damn near dry out before watering again. and it looks like you have more coco than perlite so it holds plenty of water. in the pictures I am also seeing a P deficiency that's the blotchy patches. if you don't fix that the plant will continue to loose leaves bottom on up. and lastly you are starting to yellow from bottom on up and that's a N deficiency.

its not over watering thats is causing the drooping cause i stopped watering them for 5 days cause i thought the same thing but today they were still the same and they were that dry the coco wasnt touching the insides of the pot. i have to transplant them soon anyway so i might just go back to soil.

what are the canopy tem and ambient? RH? 5 day is kinda long if your temp is around 75 or so and air circulation will aid in transpiration and evaporation, unless u have hery high RH. that will slow things down a bit. however it sounds like there not drinking and clearly have deficiencys. have you checked PH lately of runoff? If you have tried to feed them more to correct the problem, you have most certainly accumulated salts and its locking out nutrients and dehydrating your plant---- explains the drooping if your not overwatering. flush out the media. if you have an EC meter you can stop the flush when u reach an acceptable salt reading. be sure to check ppm as well to refine your determination on when to stop flushing. copious amounts of water will dround roots, so when I flush gallons thru my girls, I always add some H202. When it breaks down the resulting molecules are hydrogen and oxygen, thus increasing 02 in the root zone. plus it makes me feel better to airate my flush water first then add H202. you can never have too much 02. make sure your flush water is PH satabilzed at 5.5, when the flush is finished ur PH wont be to far off 5.8 and that's optimal. wait for the plant to respond and it does this by pitching its leaves at a 45 upwards and this is a sign of vigor, then hit that's bitch with some food. start lite and then load her up. the damaged foliage wont repair it's self if any part of it has turned chlorotic or necrotic(dead patches) if they bother you just cut them off. don't give up on the coco just learn from you mistakes and try not make them again.