A severe frost or freeze may kill an avocado tree, especially if temperatures fall and remain below 30 degrees Fahrenheit. Frost damage is evidenced with curly and brown leaves, short discolored twigs and discolored fruit. Since healthy avocado trees are better able to tolerate frost than those that battle during the growing season, suitable cultural management practices go a long way toward protecting the tree in frost damage. Determine and adhere to your fertilizer and irrigation program to keep the tree strong, and it will better withstand the ravages of sunlight.
Planning of this Mature Avocado Tree
Fertilizing the grape tree using nitrogen during the season allows the foliage to develop nitrogen, which, in turn, helps safeguard it against stresses, such as cold temperatures. At the very first sign of approaching frost, water the avocado tree. This enables the tree to better tolerate cold temperatures, as stated by the California Avocado Commission. Additionally, remove weeds under the canopy as they tend to block heat that may radiate in the soil.
Protection for the Young Avocado Tree
Prepare the young avocado tree in exactly the same manner as the mature tree by watering the soil several days prior to the frost, packing soil around the base and pulling weeds under the canopy. Use a tarp or blanket to completely cover the tree. For extra protection, Texas A&M; University proposes putting a camp lantern, strings of holiday lights or a heater under the blanket or tarp, though you will need to be cautious of fire risks.
Care of Frost-Damaged Trees
Despite your best efforts, the avocado tree may experience harm during periods with cold fever. The damaged tree is particularly susceptible to sunburn. To guard it, wait till the leaves fall and also paint the tree using latex paint, diluted with water. When the tree produces new development, prune out all of the dead wood. Since the canopy will probably be smaller, reduce the amount of water and fertilizer accordingly.
Frost-Tolerant Varieties
Although all avocado trees require protection from extremely cold temperatures, some avocado varieties bear cold temperatures greater than many others. Those that are the most susceptible include West Indian, Guatemalan, Hass and Mexican. Avocado varieties that bear somewhat colder temperatures include Mexicola, Zutano and Stewart. Mexicola and Stewart are hardy to 18 degrees Fahrenheit, while Zutano tolerates temperatures to 26 degrees Fahrenheit.