Plant might be too big?

Hi,

Just started my second grow, my tent is 1,20m high, the strain im growing (special queen #1) is said to grow up to 1,50m. I dont know what size pot they used for the tests but im growing in an 18L I believe. What more than lst and smaller pot size can i do to make sure my plant doesnt grow too high?

Any tips/help would be appreciated