In our polytunnel...we grow pak choi, kohl rabi, chillies, peppers, carrots, salad crops, aubergines, tomatoes, strawberries, melons, chinese yams.Always good harvests.All doing better now that the weather has warmed up.
Ours is 10 feet by 16 feet.Yes we do grow all that I listed but last year we did do cucumbers as well but this year we are doing cucamelons for the first time.All are mainly veg plants and they all do need to be watered daily.We have 2 openings but in the last few years only one has stayed open all year round.A great part of our garden produce and has been now for 15 years.
Do you ever watch the Beechgrove garden show? It's set in Scotland, up near Aberdeen and they grow all sorts in their polytunnels - asparagus, sweetcorn, squashes, cucumbers, tomatoes - anything that needs a longer growing season than it would get outside the tunnel.
I was lead to believe you need more sunlight than what a poly tunnel can give you for growing tomatoes... Do you grow all what you listed from seed to harvest in you're polytunnel? Must be a good size... Mines a 6x8 but I have gravel in mine