Cucumbers, Dwarf Beans & Peppers in plastic greenhouse, What is your experiences?

I only have glass greenhouses. I used to grow normal runner beans inside but they do take over, ok if you like the jungle effect. Trouble with runner beans is they need insects to pollinate and they didn't always succeed inside. I now grow french beans inside a 8x6 greenhouse that is heavy shaded by neighbour's trees. French beans don't need insects so I get a good crop, always much earlier than my outside runners.

I grow cucumbers alongside tomatoes and peppers in the other two greenhouses. One is 8x8 the other is 12x8. Cucumbers always do well and are generally trouble free provided you go for an F1 all female variety.

The size and position of the greenhouses makes a big difference to what I can grow. The smaller ones suffer from getting too hot, cucumbers and peppers don't mind that. It's bad for beans though.

Auto vents and big doors help. As I said the smallest is in shade so is ok for beans. On the other two, which get full sun, I use bamboo blinds draped over the roof. I have used a shading white special paint but I had trouble cleaning it off during the less sunny months. You may be limited about how to shade a plastic one, in full sun and if it's small it may get too hot. Definitely get a max/min thermometer, I have them in mine with a base station in my kitchen so I can track the temps easier, it is an old cheap Oregon Scientific system but does the job.

I am a novice with peppers even though I have grown them for over 10 years, I just plonk them in and treat them like a tomato which is probably why I never get much of a crop. I'm trying to follow what others do on here to improve, we have a separate thread for chillies and peppers.

 

These were taken last year, the smallest 6x8 on the left originally I grew only cucumbers in there but over the years it has become shaded by trees so I use it only for French Beans now. The other two have the bamboo blinds draped over them to help keep the heat down:

 

Inside the shaded 8X6 in early June 2021, the French beans planted out (salad crops lower down):




Inside the 8x8 Aug last year, Melons and Cucumbers:


Mainly tomatoes inside the 12x8 last year in early august: