rasing trainling begonia

Most composts contain enough feed (if the compost is fresh and new) for 4-6 weeks, and the time to feed these is once they're up and running and you've planted them out mid to end of May. I'm not at all sure your greenhouse outside will be warm enough for them, given its so cold for the time of year, particularly overnight. As for watering, once a corm starts growing, wait for the surface of the compost to dry out slightly and then water. Discard any water left in a drip tray or outer pot or container after 30 minutes.

Thanks for that Bamboo, I too got trailing Begonias about 6 weeks ago, I did not they had watering instructions, which will explain why some of mine although not rotten but the little stems keep falling off, silly me thought it was due to lack of water and have been watering them every few days. Some have thrived but some are struggling so maybe I will hold off with the water.

Sorry for interupting the question Littlejan but I just wanted to ask Bamboo advice. Bamboo my trailing begonias are being grown directly in my basket and some in one of those polanters, they are being kept in my spare room which gets sun till mid morning (when its sunny of course) Is it ok to keep them in here or should I put them somewhere warmer (I have turned the radiator of in that room)

No, should be fine without the heat indoors, specially if it gets sun in the mornings. Presumably it doesn't get below 10-15 degrees in there over night.

no it doesnt thanks

thanks for the advice, I have put my begonias in the green house, I was quite suprised how mild it was in there concidering the terrible weather here in the east.
No water sortage here dispite the hosepipe ban my 3 water butts are overflowing.