How do I limit height?

Three words: LST, LST, LST! You'll want to start LST'ing this plant as soon as it has 2 - 3 sets of nodes (probably in another week or two). From there, I'd consider HST methods once you've reached close to the desired, maximum height. For what it's worth, however, your relatively small pot size will likely reduce the risk of your plant outgrowing its tent. Happy Growing, Buddy!

I looked at your diary and it says your in 3 litres of soil . That's not much so it should stay fairly small. You can low stress stress train the main branch down creating a low even canopy. If some tops get a little tall you can also super crop them down.

You can face a fan on the plant, it will limit is hight

Screen Of Green would be your best option. low stress training.