Plant is pushing itself out from the pot
My Sans 'friends' is not too big and is kept in a semi-hydro culture so there is no soil in the pot but only clay pellets. The potting media is therefore very light. The plant has developed a large rhizome growing downwards and pushing the plant out from the pot. How can I make the rhizome grow vertically so a pup would emerge? Or can I shorten the rhizome?