No worries WT...I get a tad full of myself on occation. I appologize.

Elizabeth:
Did you read the Epsom salt thread...? If not, I'd do so before you add any more. You are compounding your problems. Also, were it a mag. def...one application is all she'd need. At most, once every couple of weeks, or once a month. Doubtful it's mag defeciency, though. Like DP said, old leaves are old news. You are likely chasing an old deficiency. Look for healthy new growth on newer leaves.

Nutrient Stress Guide

If it's not overwatering, how often are you spraying, and what are you spraying? In my garden, that pillowing of the leaves is usually due to overwatering, or consistently high humidity. (spraying the leaves too often counts, too) The plant is uptaking more moisture than it's able to expel through respiration and evaporation. Might just be the plant's lockout condition though.

After adding the nutes to your water, wait about twenty minutes, stir, and re-test the ph. If it remains stable, no real worries. But in your soil, there are buffers (likely it's lime) already there. Even if your water ph is 7.5, it can easily show a 6.8 or 7.0 runoff...for a while. Not an optimal condition, as the buffers in the top soil zones will deplete quickly, and the high ph will eventually catch up with your upper root zones, and start to burn her upper roots.
I adjust my 8.0 ph well water to about 6.8 or 6.9, then I add nutes. (Fox Farms) Has never let me down. What do you adjust ph with? (please don't say "nutrients", lol)

Quote Originally Posted by Elisabeth65
I thought the signs of magnesium toxicity were lockout of calsium, potassium and phosphorous, with deficiency-symptoms of those nutrients.
Not really. And I've never had, nor heard of, actual mag deficiency in pre-mixed soils, and using commercial nutrients. But it was a lazy mans diagnosis for quite a while. Growing outdoors, I can see where there could be a magnesium def.
Lockout can be caused from too high ph, too low ph, heat stress, overwatering, too cold, overnute, high humidity, calling it hurtful names...but usually it's from letting the soil parameters get out of whack.
Rusty Trichome Reviewed by Rusty Trichome on . several small signs of something wrong, pics provided 'ello everybody! This is not really an urgent "help me"-post, I just have some questions due to small irregularities that I've observed on my plants recently. As the grow-geek I am, I like to know as much as possible about how my plants are doing. Anyways, thanks for reading :stoned: This is a 5 week old NL plant. I've noticed some strange spots on the plant, and been wondering what they could be. I've had problems keeping the RH up, due to high ventilation requirements (I grow in a very Rating: 5