Everytime I eat a avacado ,I wash off the pit in cool water ,and push the pit into a pot of houseplant soil .Keep it well watered ...and before long a new plant is growing .One of the stalks is up to the ceiling....this one is several yrs old .In our climate (Canada ) this is a houseplant only .If I'm not diligent with the watering ,some of the stalks will lose all their leaves ,I just pull these out ,pit and all ,and next time I have a avocado I refill the hole with the new pit .