Hi, Cissy. This device might solver your problem. http://www.ebay.com/itm/hydroponic-plant-retainer-replaces-net-pots-hydroton-with-stacked-neoprenes-/331005507945?pt=LH_DefaultDomain_0&hash=item4d11773969
I've used it for small plants, and it handles fairly large plants as well. Good luck. ;)