I've searched all over and, though I know I've read about it before somewhere, I can't find it.

When a plant looks otherwise fine but the teeth on the serrated edges of the fan leaves turn up (not the leaf tips, but the teeth along the edges), what is that a sign of?

Low pH? High pH? Some micronute def.?

Thanks!

.canine.

[Brownpants]

I have had leaves do that.....I think it is from high PH locking out magnesium.
You might want to find out what your PH is.

it also could be from overfert,,, overfert will cause the tips to burn and if its bad the edges aswell,, peace..

Thanks, peeps. I believe you are right about the pH, Brownpants... but I think it's from being too acidic rather than too basic. But a couple people have suggested it's Mag. lockout and that's actually what it looks like.

It happened right after a transplant to a fairly hot organic soil mix. The grower who provided the recipe mentioned that upon first transplanting to this mix, the plants will squirm a little bit getting used to it, "like a person getting into a hot jacuzzi." heh heh.

Maybe it's a combination of both. I'll check the runoff tonight.

Thanks again.

flush them and then use epson salt for the mag 1 table spoon per gallon. worked good on my lil ladies. good luck

What is your room temp and how close are they to the light? If they look otherwise fine, sounds like a heat issue.

If it's only the upper most leaves, you may just need to raise your light. Cupping tends to start around 85 degrees. The plant physically tries to reduce it's surface area when too much heat is shining down.

Remember too that even if you have a room thermometer on the wall, it's significantly hotter directly under the light. Digital thermometers are usually only +-3 degress accurate. So, if the wall says 85, it could really be 88, and easily 95-100 degrees 4-6 inches under the light.

Got to get an accurate ph check too. Otherwise you are working in the dark.

Good luck...
DKF

[Verite]

There are also certain strains that are just prone to that kind of leaf action. I have seen that in a majority of c99 pics.

Thanks, Verite.

Farmer, I missed your post. Sorry about that and thanks for the info. My max temps are 74 and have a fan blowing across the tops.

Turned out to be a pH thang... fed with solution pH'ed to 6.9, which is higher than I normally use, and the plants are very happy with that. I'm also using a new, hotter soil mix and I think the adjustment period after transplant caused them to do a little squirming, too.

All's good in the hood now.

Gracias to everyone for the great help.

how did you alter the ph in soil? thanks!!

By altering the pH of my water/solution. Altering the pH of your water will do the trick unless you made a poor choice in the type of soil/ammendments/fertilizers you used.

.canine.