EEKK! I don't recommend planting them up to the cotelydons. If they need support, fine, a fan will butch them up! If you plant that deep, it may cause the stem to rot.

You can support with a toothpick, Q-tip or my favorite the chop stick. If they are holding up their own heads under a light breeze, just leave em alone! They will get stronger and stronger and soon need no support.