How to get a thicker stem

I am growing Jack the Ripper, and it's growing so fast! I have a fan blowing in the room but is there any way to help thicken the stalk?

well if it's not thick enough, it could be your light is a incandensent light, which makes the stem grow to fast for how strong it is.. if not then make sure theres enough potasium in your fertilizer.

silica blast!

my girl had a thin stem as well so i got some computer fans on her, put them pretty close and only took a week for the stem to dubble in thickness

Topping the plant to have it bush out may help with you problem. Using a light with a higher blue content (metal halide or CFL with a high color temperature) will also help keep your plant compact. If all else fails you can stake your plant to support it.

thank you .

To thicken the stem a fan helps but so does placing the stem between your index finger and thumb and rolling it back and forth ever so slightly till the plant becomes bendy, this causes a stress on the stem and it will release enzymes to strengthen the stem because the plant will think it's not strong enough in it's conditions.

-DO NOT bend the stem so it breaks, or bend it too much that it creates a lean, you want to make it slightly more rubbery than rigid but don't bend too much.