Dwarf french bean. Problem?

I know it's a bit early for DFB's, but I thought I'd try some seeds in my little home made heated growhouse. They sprang up lovely but over the last couple of days some of the leaves have curled a little as per the photo taken just now. Any ideas whether I've over watered, under watered or they've caught a chill? The thermometer is saying 40c but that is because the sun is shining on the glass dial. I always lift the lid when the temp is up and the air temp was actually 21c at the time of this photo as measured by a thermometer in the shade at the back of the growhouse. According to my wifi sensors transmitting to a display in the house, typical day/night max and mins go from 25c to 15c although I did have a low of 9c the other night when it turned frosty and have since turned up the thermostat on the 3ft 180watt tube heater. Any advice please.

 

Wind maybe? The leaves look like they have dried out. Those young plants will be very tender ...

 

Yes, looks like they have dried out or simply sun scorch, in these very sunny days you may need to put some shading up, anything will do from newspaper to proper shading material.

All the compost looks very dry in there, also if you water /spay/mist when sunny , ensure you do not get any water on those tender leaves as the sun will burn them.

The ferns looks as though they are turning red which can be a sign its too bright for them, normally a shade plant.

 

Marvellous thank you. I can soon remedy that with some shade. The sun does seem to have been very intense and there's been a lot of it for this time of year. So much so that I have a sun tan from working and sitting in the garden In the growhouse they seem to be well sheltered from wind even with the lid up, and I haven't noticed much more than a light breeze in the last few days. I have sprayed the compost with water and have tried to avoid the leaves, but possibly not careful enough. The pots are in a tray with some capillary matting which I keep wet.
Thanks very much for the advice, I will try and save them from scorching.

 

Hi,

Think you might have shown us the real problem.

Cap matting is effective, but to be at its best the plants roots need to be down deep into the pot to really access that water, with your young seedling etc that will not be as effective.

The left hand pot looks as if it has its own saucer ? so not sure how it could use the cap matting ?

You really need to generously water with a small hand watering can or bottle from the top of the soil / pots as things do look very dry.

In the hot weather forecast for the next two days you need to water at least one a day from the top, do try that, with a little shading, think you will find the beans take off !

You might need to stake them if they grow too tall, but try and keep them in there until all the frosts have gone as they will be knocked back or killed.

 

Thanks @ricky101
You are very observant, and correct that the left hand pot just has it's own saucer and no capillary matting.
I will follow your advice and get them sorted.
Loving this forum for the friendly advice I'm receiving as a very inexperienced newbie getting interested in a new hobby. Thanks for all your info, I'm taking it all in, and learning as I go along.

 

I've never had a problem with capillary matting (seedlings or otherwise), provided the compost in the containers remains moist it will lift the water into the compost. But ... lots of capillary matting sold is so thin it is all but useless, and pots need to be in good contact. And if the matting dries out it won't work, the containers will dry and getting it going again isn't straightforward as it needs moisture everywhere to work. Best bed in that situation is to water from the top, and then use the capillary matting to share any excess, and then also water the capillary matting (without any particular care) to make sure it has a decent reservoir.

But I've gone off capillary matting having used it for years because it is too difficult to control the amount of water, everything gets the same flow rate, and often that is too much, and it doesn't work for large containers. My preference now is for flood-and-drain. Flood the tray the plants are in for a few minutes, and then let it drain. Organise the plants in trays so that all in the same tray need the same frequency. So recently potted on may only need every other day, whereas something that is close to being potted on might even need twice a day

For small numbers of pots just put them in a tray of water for a few minutes and then take them out again.