Acacia Cold Tolerance
Most acacias are native to warm climates such as Florida, Mexico, and Hawaii and can’t withstand cold below USDA plant hardiness zone 8. However, there are a few hardy acacias that can tolerate cold winter weather. Here are two examples of hardy acacias for chilly climates:
Acacia Winter Flame (Acacia baileyana ‘Winter Flame’), also known as golden mimosa: zones 4-8 Prairie Acacia (Acacia augustissima), also known as fern acacia or whiteball acacia: zones 6-10
Acacia Winter Care
If you live in a marginal climate that occasionally experiences frosty weather, it’s a good idea to provide acacia winter care to help your plants survive until spring. Plant acacia in a protected location such as near a south-facing wall. Protect the roots with a thick layer of organic mulch such as straw, pine needles, dried leaves, or fine bark. Don’t allow the mulch to pile up against the trunk, as wet mulch may promote rot. Never fertilize your acacia after midsummer. Nitrogen-rich fertilizer is especially risky at this time because it produces lush, tender growth that will likely be nipped by frost. Remove broken or damaged growth in spring. If your climate is prone to hard freezes, plant acacia in a container and bring it indoors when nighttime temperatures drop below 45 degrees F. (7 C.).
Growing Acacias Indoors
Can you grow acacias in winter inside your home? Yes, this is another option, provided the tree isn’t too large. Place your potted acacia tree in a sunny window, preferably south-facing. Otherwise, supplement available light with a grow light or fluorescent bulbs. Water acacia deeply when the soil feels slightly dry. Always allow the pot to drain thoroughly. Never allow the plant to become bone dry. If the air in your home is dry, increase humidity by placing the pot of wet gravel or pebbles. Move your acacia back outdoors during spring and summer.
