How to grow an avocado tree in a container from sfgate.com. Choose one that is 24" wide and 18" deep. "Water the Hass avocado lightly when the soil surface feels dry to the touch, and avoid overwatering, which can cause root rot. Fertilize with 1/4 teaspoon of balanced fertilizer every three months after the first year of growth."
Can Grow Avocados at home-Delicious, Cold-Hardy Avocado http://www.fast-growing-trees.com/Hass-Avocado-Trees.htm?utm_source=google_medium=base_campaign=BASE_term=%7Bkeyword%7D=CIfS8--yp7UCFSXNOgodOnUAwQ