so i got my dragon fruit a couple years ago from disney world and its grown to about a foot and a half. it has multiple vines coming from the roots and is overall doing well. i just have a few questions. 1. are they supposed to be skinny at the very bottom? 2. i am potting it so how is the best way to prepare the soil(what to mix in, etc.) 3. what is the best way to get them to climb? thank you very much for your help