i forgot when for the uk

sorry abotu this u lot but i forgot the months to start out side anyone know this offhand?

its may - september but check on them in september and wach the weather cus if there is gonna be ne ice in spetember bring them indoors for atleast a day or so

It depends how outdoors you mean.

I start mine early april/late march in Greenhouse. Then harden them of in a coldframe. Then move them outdoors.

I try to get them to flower early outdoors by blocking 12 hours of light any way i can.

But if your starting them totaly outside then may to sept is best like Briman says

Hope this helps

Peace
Dss

Any time after the last frost, the trick is figuring out when that is.