Too much water
Not enough water
General shock/stress from transplant, environment, etc..
PH too high/too low
Just to name a few. The ones listed at the top are most common to cause drooping leaves, start there and work your way down ruling out each problem until you find the culprit.
It won't be heat with a cfl u can practically have them touching because that don't create that much heat plus if it was heat your leafs would start curling in to protect themselves.
Thank you Antics! Great answer!
Recently I've been wondering if perhaps my CFL lights are too close to my leaves. Could that be a possible cause? It seems as if only the uppermost leaves are curling downwards, and this is where the lights are closest to.
I imagine the heat from the lights could dehydrate those leaves. What do you think?
What do I think, or what did I learn from my mistakes? lol
I used 23w, and 45w CFLs in my grow. I learned twice that both bulbs can damage leaves. The spiral design allows the leaves to be blown in between the tubes, and the leaves can become trapped there. But what will happen from what I've seen, is the leaf that's touching the bulb will dry out, it will turn from green, to yellow, and then quickly turns brown.
With an oscillating fan, I would leave a gap of 2.5cm/1" MINIMUM between the bulb and the closest leaf when the fan blows it towards the bulb. 5-7.5cm/2-3" is the preferred distance when you'll be away from the plants for any extended length of time (At school, at work, sleeping, etc..) This will help protect your plant during any growth spurts it might go through during that time.
EDIT: How close are your leaves, and what wattage/how many bulbs are you using? And what is the temperature at the canopy?
They curl inwards like a boat, and tip burn could be over nutes,
I'm new myself so you would have to look into it more.
Look in here too.
Dont water too often,may be ox problem,make a good drainge,people usually uploads pics you know and come up with more details than my plant is drooping,and now start guess.
What time do you notice them droop, are they constantly droopy. they can droop a couple if hours before lights off, when they have taken all the light they can that day, so they relax and get ready for bed.