Greenhouse Autoflower

I have 2 LowRider female automatics doing well in a greenhouse in the UK. They are currently a mere 6" tall but they seem to be flowering and there's a distinct aroma from the flowers. Lovely.

2 questions..

• Is this normal and will they simply continue flowering as they grow onwards toward their budding stage?

• Also, haven't fed them anything yet, is it time to give them some feed. I have tomato feed. Is that OK?

cheeerz