Too much heat in green-house?

[Ader1]

I'm growing some tomatoes, cucumber and some Thai sweet basil in my green-house. I started the toms and the basil off inside the house. I took them both outside and although neither have wilted both have some whitening/whithering of some leaves. What could this bee? Is it too much heat in the green-house? My green-house is also set right next to a white wall.

PS
I've noticed whilst driving around that quite a few growers have a layer of bubble wrap around their green-house. Is this to prevent scorching? Maybe I should get some if that's what my problem is? Thanks.

[Nicos]

Hi I've moved your thread so more people will get to see it

[Bigmallly]

Bubblewrap is normally used to keep heat in not out. You could either buy some shading paint to put on your windows or get hold of some netting just to keep the intense heat off, keep doors open & make sure you have plenty of ventilation.

[rustylady]

As Bigmally says, it's not good for a greenhouse to get too hot.

[Two_Sheds]

have you got one of those plastic zip up greenhouses? Keep it open

[Ader1]

ok thanks for the advice. It's a glass-house. No zips I'm afraid.

[black olive]

Im keeping the louvers, top opener and a door open in this heat. Id left it closed before planting out last night and my growbag compost was a good 35 degrees !!!!!!!!

[SarzWix]

Definitely sounds like some shading is required. The white wall will be reflecting heat and light onto the plants too, which in early spring and autumn will be really helpful as light-levels are lower, but in the summer is too much.
As Mally said, shading paint can be painted on now and then washed off in the autumn (or Windolene does much the same job), or you can rig up either shade netting (same as windbreak netting) or use net curtains if you can get your hands on some.

[Two_Sheds]

(or Windolene does much the same job)

... and smells nice

Shading or netting on the outside of the glass is the way to go, don't rig it up inside because you want to stop the sun hitting those panes of glass.
My g/h is a nice happy 22c even on the hottest day (I have louvres and netting)

[bramble]

I have been pouring a few cans od water on the greenhouse gloor during the warmest part of the days. It does help to take the temp down.

[DaveC]

Wilkinsons sell Coolhose shading which is a powder you mix with water to create a paste and then paint on the outside. Its rain proof but washes off easily at the end of the season.

I just cover the roof of my 6x8GH in it and its still a good temperature in there without the risk of scorching any leaves.

I think its around £3 for a box of 4 sachets. One sachet easily covers my roof with plenty left over.

Hope this helps