How Long Do Little Basil Trees Last?

Climate Considerations

• Although it branches out in bushlike form reaching heights of 1 to 4 feet tall, basil isn’t really a tree. It’s a tender, heat-loving herb that hates temperatures below 40 degrees Fahrenheit. The most commonly available basil varieties are annual, which can be grown as short-lived perennials in warmer U.S. Department of Agriculture plant hardiness zones 10 and 11. Bring basil indoors prior to the onset of frost. Place in a sunny window that receives at least six hours of daily light.

Tip-Top Condition

• Look for dark, vibrant leaves in both green and purple basil varieties, avoiding plants with yellowing or pale foliage. The container must have holes in the bottom. Basil requires regular watering, about 53 inches per year, but drainage is a must. Soggy conditions invite root rot and soil fungus.

Pest Patrol

• Some store-bought basil plants are susceptible to mealy bugs, spider mites or other troublemakers. Check tops and undersides of leaves for webs, holes or tiny insects buzzing about. If you notice activity use clear water or add a few drops of dish soap to a standard 32-ounce spray bottle before spritzing leaves. For help identifying a pest or disease problem, contact your local university cooperative extension service. There are regional offices in every state.

Harvesting Techniques

• Plants 6 inches or taller should be regularly harvested by pinching the ends of any branches with six to eight leaves. Remove leaf clusters and the stem down to the next set of leaves. It may seem counterintuitive to pick fresh, new growth rather than plucking old leaves, but that’s the way to make your basil last, producing 15 to 24 cups of leaves per plant per season.

Fertilizing Guidelines

• Replenish after a heavy harvest or feed every four to six weeks for indoor plants and three to four weeks for outdoor plants using a 1/2 tablespoon of half-strength, all-purpose water-soluble fertilizer solution per gallon of water.

Prime Locations

• It might take a few tries to find your basil’s happy spot, especially if it’s gone into shock from being moved indoors. A southern exposure is best; northern-facing locales usually don’t offer enough heat and light. In the hottest part of southern and southwestern summers, some afternoon shade or a spot in indirect light can be beneficial.