curling leaves question

[mountainman]

When leaves start to curl up, that's too much water, right? I'm in rockwool with a weak solution of nutrients and Earth Juice Catalyst with some silicates. Any ideas/help?

mountainman Reviewed by mountainman on 02-25-2006. curling leaves question When leaves start to curl up, that's too much water, right? I'm in rockwool with a weak solution of nutrients and Earth Juice Catalyst with some silicates. Any ideas/help? Rating: 5

[Swizzy89304]

Are they curling like this?

This was caused by heat.

[mountainman]

No, yours clearly are wilting. Here's some pics. The first picture is my best soil beside my 1 hydro. The soil plant is very erect with no drooping, while the hydro plant is obviously not drooping, but the leaf edges are curling upwards, not downwards as a wilted plant would.

I also keep a thermometerr right nearby and is doesn't go over 82.

[Swizzy89304]

Lol shes not wilting, when I took Fiona out and put her on the windowsill to enjoy some natural light she cleared right up. Im thinking it was a heat problem or something, but thats sorted now.

Leaf curling up can be a sign of a Magnesium (Mg) deficiency caused by too low of a pH level. Magnesium deficiency will show as a yellowing (which may turn brown and crispy) and interveinal yellowing, beginning in the older leaves. Interveinal chlorosis - in laymans terms, yellowing - will start at the leaf tip and progressing inward between the veins. It could also be a sign of excess heat and humidity in the grow room.
You need to check and adjust the pH level (Im sure youve done this). When the pH is not at the proper level marijuana will lose its ability to absorb some of the essential elements required for healthy growth. If youâ??re growing in soil, Magnesium will begin to be locked out at a pH of around 6.5 and lower, in hydro it starts at 5.8 and below. If the pH is correct, then add 1 teaspoon of Epsom salts per each gallon to your water. Or, if you prefer to foliar feed them, add a ½ teaspoon per quart to a spray bottle.

Tell me if that worked or not! Epsom Salts ban be bought at a chemist, I bought a big 250g tub for about £2 (around $5)

[mountainman]

Well, there's no yellowing spots. If I turn off the HPS and look at the leaves under regular lighting there are no visible yellowing spots. It just seems to be the curling. The roots in the res seem healthy too.

As far as epsom salt, what is the purpose of that? I've heard that it ends up stunting plant growth. Also, I've been trying to keep the ph between 5.7 and 6.0. It's usually between 5.9 and 6.1. Right now, it's 6.15.

[Swizzy89304]

Epsom salts have a VERY high content of magnesium. Dont know about them stunting growth though

[mountainman]

I'll give it a try. Any ideas what sorta store might be open right now and carry them? Target? Walmart? Grocery stores?

[Swizzy89304]

Mate, I havent got a clue to be honest. I live in the UK, so we dont have Walmart and all that. Jus good ol Sainsburys and Tesco...
Try at a chemist, thats where I got mine from. They sell them because they can help with constipation aswell :dance:

[mountainman]

I'll try a pharmacist. If it helps constipation, I would expect them there.

[mountainman]

Found it! W00t! Bought 1 kg for $4.34 from the 24 hour CVS Pharmacy. Thanks a bunch, I'll keep you updated and post pics of the results. :-D