1. Fill a jar with water. 2. Remove an avocado pit and wash it thoroughly (use the discards for guacamole). 3. Insert four tooth picks into the avocado. 4. Suspend the avocado pit over the jar and top off the jar with water. 5.Place the jar on a sunny windowsill and wait about six weeks for it to sprout. 6. Then plant it (or let it wither and start over). If you live in a cold-weather climate, plant the avocado tree sprout in a container.nd because I've never actually seen an avocado tree grown from a pit, I'd love to see photos of successful plantings. Use the upload feature below to post a photo of your avocado tree in our community photo gallery. After you try it, show it off to other members in the. gardener's gallery.