yellow leaves

I have had this problem for sometime and can not figure out what's going on. The lower fan leaves start losing there color and they are developing brown spots as well. The strain is blue dream I grow in dirt the brand is pro mix hp, I use ro water now with a little tap water and I keep the pH...

hey these are my babies, yellowing at the tips of the leaves and stems seem weak for how big they are, about 5 inches tall under a 600w hps, mixed 50/50 happy frog and ff light warrior. any advice on any thing to help me grow better and more efficient is appreciated! =)

Good evening fellow growers!.. (A friend) of mine has a setup in a 2 by 2m Tent with 2 x 600w halogen lights, First attempt with AUTOPOTS at flowering, 100%coco ,4 cheese 4 lemon haze always been top fed past 3 years, temperature is around the 28's never dropped below 20's so its...

I'm starting to get really confused about one of my plants... it's growing REALLY slowly for some reason and is struggling. Lately has been getting worse and worse by day and I don't understand why. I currently have 3 plants growing under HPS. Here's a photo: From left to right: New...

Hey again Like I said, I'm new haha. Over about the last week I've noticed the original feeder leaves on all of my plants started to get yellow. Being day 21 feom seed now, I didn't think much of it. But, last night I noticed that the original set of serrated leaves were starting to yellow...

LSD - 25 AUTO seed im currently the 3rd week of flowering and the leaves are starting to turn yellow!... I'm using Advanced Nutrients PH Perfect Bloom @ 2ml per litre and the PH is sitting at around 5.8 - 6.1 growing in coco medium temps are at 25c can anyone please help me out with what could...

First time grower here! I'm growing 3 plants in a grow box (hydro setup) under 4 60w CFL's. Still in the vege stage and for the life of me can't figure out why the leaves continue to yellow. I've changed the water every 7 days and do daily ph checks to keep it at 6.0. oh...I'm using Raw's Nutes...

My blue mystic auto flower is in about the 6th week of flowering, but the buds are already so damn frosty. I have a jewelers loupe and the crystals are cloudy, but not yet amber. According to nirvana seeds it says to flower 7-9 weeks. My fan leaves are starting to turn yellow and die from the...