Sennetti question

Wife bought these Senetti, I have in poly greenhouse at the moment as I reckon too early to plant out (Scotland)
They look a bit `leggy` to me and I wonder if I should cut them back or let them flower first.

 

I'd let them finish blooming Scudo then take about a third of the growth off the top.

 

I bought mine very leggy last year - I waited (forgot) until the flowers faded and then cut them down by about half. They rallied and flowered again shortly afterwards, though not as well or as long. This years are a lot more compact in comparison; only difference is the flowers seem to be slightly bigger.

 

Thanks for the replies. I will leave in the greenhouse for a bit as is and cut back after flowering.