A lot of my plants are self pollinating....some of them I'll pollinate with an electric toothbrush. ;-) During the warmer season, I just leave the doors and vents open and let the bees do the jobs!

Here is a link that might be useful: my HFGH 10x12

Bumble bees sting. I either grow partheocarpic plants or use artificial means to pollinate the blooms - but I'm only growing tomatoes and a banana tree this year.

Mike

The bumble bees you get for pollination do not sting. However, they are mainly for large greenhouses that have a lot of crops in bloom.

You might try ordering flies. They are fantastic pollinators...providing of course that your greenhouse is kept warm enough. Winter is a tough time for this.