[Frog]

Am growing tomatoes in our greenhouse for the first time. The leaves are curling up. Have been told by some people that the greenhouse is too hot, and by others, that it is too cold! HELP - am rather confused, and not knowing what to do for the best......?  :?  :oops:

[Aunt Sally]

I'm not sure if it's heat or water that causes it but it's nothing to worry about.  The plant will sort itself out and the crop won't be affected.

[millie C]

Mine do that every year - they seem to curl lengthwise and under (if that makes sense) it never seems to affect the crop, and I have been told that it is caused by the variation in temperature - ie v hot in the day and cold at night. I'm sure someone who knows a bit more will be along soon!

[daveinbracknell]

Hi,

I did some research on this as I was concerned to

Yes it is the variation in temperature, my Green House goes from around 30 degrees to 15-10 degrees in the evening I see this problem.

To battle this I have put in a Fan that detects both heat and cold, so when it gets about 25 degrees it starts to circulate the air, it seems to be helping, also helps with the humidity as with such temperature variations you can get some humidity if not vented properly, as a result of this I have a horrible yellowing of my leaves which I am working on at the moment, but just to warn you, another result of these temperature swings could also cause humidity.

Dave

[p00rstudent]

my tom plants that are planted outside are doing the same thing, though the first tomatoes have started to appear so i am not too worried.

[gobs]

Physiological leaf roll - need a geek smilie - the plants are sorting it out, protecting themselves if you like, rolled up leaf: less evaporating area in heat to conserve moisture.

All comes down to proportion of roots to foliage and other, environmental factors.

Apart from transplant shock and pruning - which will resolve in a little while - bad horticultural practices can also cause it, like water-logging. All related plants do it.

Everybody is doing it, it's all right.    

Don't over water and don't let dry out, if roots confined keep foliage thinned, otherwise let them do their thing.