tomatoes not setting fruit

[pinkelephantnightclub]

any ideas? in greenhouse, plenty of flowers, no tomatoes! is my first year growing so not sure if I am doing anything wrong- thanks for any advice

Do you have the door open to allow insects in to pollinate?

It may just be early days. Mine have flowers now (but only just!) and no fruit yet. But it's only early July!

I'd ventilate more - high temperatures can kill pollen, and perhaps try misting the flowers with a hand sprayer (but keep the humidity low in general to avoid blight.

I'd expect set flowers by now in a greenhouse unless they were sown very late - we've had the first few ripe toms this week from plants sown end Feb/early March.

Use a paint brush. (A small one). Brush each of the flowers on the plants to help pollinate them. In effect you are doing the job of the insects.

You can just give the plants a bit of a shake even rather than bothering with a paintbrush - most toms have a fused cone of petals covering the anthers, and are self-pollinating, so it's just a case of 'tripping' them - the insects don't ever get to the pollen. My guess given the weather recently is heat, though.