Dark Purple Stems, Blotches forming on leaves, and yellow tint coming on leaves. HELP

this plant has stems on the upper new part of plant that have turned dark purple. bottom leaves had nute burns from before but now new leaves where stem is purple are starting to turn blotchy and starting to look yellowish green. have no clue what is wrong maybe nutrient deficiency so i fed them once a diluted solution. think it burned the plant again though. have the plant at a good ph of 8. have miracle grow 3month nute soil with lime added to balance ph. With this soil, which is crap, it wouldnt seem like it would be a nute deficiency. are roots not soaking up food? maybe a magnesium deficiency? or disease? (hope not). Please let me know if you have any advice or had the same problem and fixed it. thanks. peace and one love my brothas and sistas.

sorry forgot to add pics. here they are.

pH of 8 is way too high, in soil you need pH of 6ish

Try a little more water, looks a litte dry. and add a little more drainage next time u mix soil. it helps O2 get to the roots.

deff not a disease so cross that off the list

I have the EXACT same issue although my plant is in it's second week of flowering and 5 feet tall...

Sorry for gravedigging
but I havnt been able to discover what's wrong with my plant and it's killing me...and my plant

Stems turning red/purple is normal, nothing to worry about.

Dr.RR said:

Stems turning red/purple is normal, nothing to worry about.

Click to expand...

Theres something wrong....look at the pics.......ph was off probably nutrient lock out.........

Then why are both new and old leaves starting out with a brown tip at the VERY tip of the leaf then about half of those a few weeks down the road turn slowly yellow and more brown on the tips and fall off. The new growth around the buds is green and dark but soon fall off about 50% of them a week or two later