[Errol]

John, when the temp reaches above the 90 degree mark, the blossoms will drop off, also the same if temps fall down in the 50's. If you can control the temps in your greenhouse in the 70's or low 80's you will be ok. At 70's-low 80's the vine will produce blooms again. your idea of using gutters (with drain holes) sounds like a great idea. they would be deep enough for lettuce and spinach. In the winter I grow lettuce, radishes, carrots in cold frames. I have 5 cold frames that I use for this. They are about 16" deep so I just put in about 6-8 inches of compost, horse manure and rotted sawdust/sand, Also cabbage is a good fall crop, even into early winter. A couple light frost's makes cabbage, broccoli, and Kale somewhat sweeter. Kale can even go through the whole winter. I have sown peas in october, and with a row cover, I had really early spring peas when most people were just started sowing spring peas!

 

[Errol]

John, no I did not get a chance to see your pictures, I do want to see...You are lucky, as I don't have a greenhouse, but I do the next best thing with row covers, cold frames and I "winter sow" in gallon plastic water/milk jugs and 2 litter pop bottles. If anyone has never wintersown,in plastic containers you should look into it...wintersown.org
good gardening