All that i am good at so far is nearly killing my plants. Just when i thought that they were doing good, the leaf tips began to wilt and the edges of the leaves are a lighter green. The plants are under 6 40watt t12 tubes at (6500k). The PH of the soil is right on 7 and i am using miracle grow potting soil and perlite. The plants are about 30 days old. I flushed the soil of the 2 larger ones yesturday and raised the lights.(the lights were only about an inch away but shouldn't matter with floro's?) They are under 24 hour light which i am about to change to 18/6.
If I haven't given enough info. let me know. I'm not concerned with the tiny one because i don't think that there is much hope for it.
Thanks
C

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check some of the sticky posts, looks like too much nutes. i had one do similar, but after flushing it came back strong as ever. good luck

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looks like nute burn and over watering. flush throughly and water with water only next water, add nutes at 1/4 strength intervals every week.

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Thanks for the help

first thing get rid of thoses t12s and go get your self ( F54 t5 HO) they put out 5100 lumens 6500k grow lites .called sunburst can be used from seedling to flowering. and calm down and learn from your mistakes . i did......chuck

I know that the experts on this site suggest 7.0 pH for your soil, but the experts at Advanced Nutrients Medical say that 6.3 pH for soil is better, because the slight acidity of the grow medium causes the plant to absorb nutrients better.

I agree with the other comments. Looking at your pictures I’d say your plants are suffering from nute burn. What are you feeding them, anyway? It’s not just the fertilizer but the parts per million in your watering can that matters. If the ppm is too high, your leaves will turn yellow at the tip and around the sides.

Flush them with pure water and start fresh. I would advise you to visit the Advanced Nutrients Medical website, in order to learn some things about plant nutrition. They have in depth articles, as well as real life technical help on the other end of a toll-free line.

I would also urge you to get some better lighting, if you want your plants to grow tall and potent. Fluorescents just don’t cut it. Even a single 400W Metal Halide or High Pressure Sodium light would do wonders for your gardening efforts.

As far as nutrients, I’m using Sensi Grow A & B and Sensi Bloom A & B, which were developed by plant scientists specifically with cannabis in mind. Miracle Grow was developed with vegetables and flowers in mind, definitely not cannabis.

These species specific ferts have all the macro and micro nutrients that your pot plants will need. I also use root colonizers, in order to enhance root growth and food absorption. Have you heard the expression “as below, so above?” If you got healthy roots, you’re gonna get a healthy, bushy plant with major sized buds.

Speaking of increasing bud size, why not consider using Bud Blood, Big Bud, and Overdrive during specific weeks of the flowering stage? Bud Blood is meant to be used during week 1 only, while Big Bud should be mixed in to your nutrient solution during weeks 2, 3, and 4 of flowering. Then during weeks 5 and 6 it’s Overdrive’s turn.

These very powerful bloom enhancers should never be mixed in all at the same time. They would burn your cannabis plants to a crisp, if you did that!

I also believe in feeding my medpot plants (my wife Claire and I are medpot patients) Vitamins in the form of two excellent Advanced Nutrients products: B-52 and Grandma Enggy’s Seaweed Extract. The latter is like a multi-vitamin, while the former is an excellent B-complex.

If you know your vitamins, you know that humans take a B-complex to reduce stress. I give it to my marijuana plants for much the same reason.

Thanks for the help. I'll give you an update. I thought that the water that I was buying had a neutral PH, but it did not. I am religiously PH'ing my water as I should have been all along. I then realized that the venilation in the box was poor and have fixed that problem. The plants seem to love these changes. So to the other newbies out there, ph your water and make sure that your plants are getting plenty of fresh air. Here is an update on the once sick plants. Thanks again.
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they came back nicely!

hey cast my plants r doin the exaxt same and i use distlled water and ph is a lil low but not bad wat did u do .....mine is almost 4 ft tall though

Flower that puppy boy. Perhaps its a satavia. They seem to grow pretty tall. I've found the yield to be so low I'm not going to grow those varieties for a while.