you can put a small stick in the dirt, rest it up against the stem, and gently tie the stem to the stick, holding it up.

Nochowder is right again, BUT, I would like to add a caution sign to that.....when you stake your plant, be careful of the positioning of the stake before you drive it home. If you drive the stake through the main tap-root, you will kill the plant. So be sure to go at least a half a foot to the left or right of the plant. The tap-root is the main root that gos directly under the main stem.....thats the part u WANT to MISS. Good luck, and happy growing-emtpockets