This is my first year of growing tomatoes in a greenhouse.
As there are no bees in greenhouses do I need to manually pollinate the flower trusses ? If so do I need to buy some sort of solution ?
Tomatoes are self pollinating -you dont need insects
Just give them a shake to help them on their way occasionally -they will be fine.
....... besides, as the weather warms you will begin to open the greenhouse door/windows more, and lots of insects - includong bees - will get in and work for you.