As best as I can tell from checking the two links below, one of my mothers to be has an Mg deficiency. The leaves feel hard and brittle. The yellowing, which turns brown starts at the tip mostly, but also the outer edges. I doubt it matters, but this is the same plant that is in with the shrooms in this post: http://boards.cannabis.com/plant-pro...ooms-weed.html. It starts in the older leaves, and eventually the bottom ones turn completely brown. There is interveinal chlorosis, and it's growing really, really slow.

The two places I checked are here:
Grow Marijuana FAQ, Cannabis cultivation - marijuana growing tips & photos

and here:
114 Photos of Mineral Deficiencies in Plants (~ 1 meg) for Visual Diagnosis

This last one is really cool. Less people know about it, but it may be more helpful. Just use your browser's search feature to search the page for individual minerals, like say magnesium, and you get between 10 and 25 examples (of stuff other than pot) of that deficiency or surplus. I suggest people bookmark both links, and maybe even make them available offline incase they ever go away.

I really don't want to lose this mother. Please help.
Opie Yutts Reviewed by Opie Yutts on . Magnesium (Mg) deficiency? Pics As best as I can tell from checking the two links below, one of my mothers to be has an Mg deficiency. The leaves feel hard and brittle. The yellowing, which turns brown starts at the tip mostly, but also the outer edges. I doubt it matters, but this is the same plant that is in with the shrooms in this post: http://boards.cannabis.com/plant-problems/134279-shrooms-weed.html. It starts in the older leaves, and eventually the bottom ones turn completely brown. There is interveinal chlorosis, and Rating: 5