The Stewart avocado is a hardy variety of avocado tree that can withstand below-freezing temperatures for short periods of time and tolerates frequent temperatures around 20 to 30 degrees Fahrenheit. The Stewart avocado tree enjoys a soil pH of 6.0 to 6.5 and full sunlight. This avocado tree variety is self-fertile and easy to plant, offering a crop harvest of avocados between September and November.
Plant your Stewart avocado tree in a protected spot that is shielded from cold winter winds. Find a non-lawn planting site that receives full sunlight. Plant your Stewart avocado tree anytime from March through June.
Dig a planting hole that is the same depth as the length of the root-ball and 3 or 4 inches wider. Place the root-ball gently into the hole and backfill with soil. Be careful not to disturb the root system.
Water the ground around the tree, soaking the root system thoroughly. Allow the surface soil to dry out slightly before watering again.
Mulch around the tree with redwood bark or another coarse, woody mulch that is about 2 inches in diameter. Keep the mulch 6 to 8 inches away from the trunk, forming a 2 to 3-inch layer of mulch.
Feed your young Stewart avocado tree a balanced fertilizer, such as a 10-10-10 formula, that contains zinc. Give your young tree a light dose, limiting the feeding to only 1 or 2 tsp. fertilizer per year.