Your plants will stop going vertically when you see their nodes start to grow really close together. By the look of your plant, It will continue to grow upwards unless you tie it down. Tie the top of the main stem and bend it as low as you can without breaking the plants stem. You can lower it each day and you will see the plant tops and leaves begin to turn upwards towards the light. I wish you the best of luck with the rest of your grow and harvest :thumbsup: . Keep Em Green Bro...