Sweet basil, (Ocimum basilicum) is the most common variety of basil sold in the United States. While there are many other basil varieties, some closely related and some not, I chose to focus on sweet basil since I’m the most familiar with it.
Sweet Basil Information
Size: Sweet basil can range from 24 – 38 inches (61 – 97 cm) in height depending on conditions.
Water Requirements: A lot of water is required to grow basil. Soil should be kept damp, but not soaked.
Soil Requirements: The soil that sweet basil is planted in should be fertile and well drained. Basil prefers a soil that is very slightly acidic (pH 6.4) but can tolerate a wide pH range.
Light Requirements: Sweet basil likes to be grown in full sun (at least 4-6 hours of direct sun).
Temperature Requirements: Sweet basil does not tolerate cold temperatures well and should be kept above 40°F (4.4°C).
Nutrient Requirements: A fertilizer with equal amounts nitrogen, phosphorus, and potassium with additional nitrogen supplementation later in the growing season is recommended for sweet basil.
Pruning: Many people who grow basil cut off flower buds, as they believe it causes leaves to become bitter. Nipping off the top set of leaves can encourage the basil plant to become bushier. Regular pruning is recommended.
Pests: Although sweet basil is relatively insect repellent, it can still be bothered by pests such as whiteflies, cutworms, and nematodes as well as fungal and bacterial diseases.
Companion Planting: Basil is often planted along side tomatoes.
Growing Indoors: Basil is well suited to growth in containers, both indoors and outdoors. Pots need to be at least 8 inches (20 cm). The best growing medium is a soilless mix and the light, water, and nutrient requirements are similar to those of an outdoor plant.
Bonnie Plants – A good basic introduction to Sweet Basil. The plant I took the cuttings from was a Bonnie Sweet Basil plant.
National Gardening Association – Basil Plant care guide
Herb Society of America Guide – Basil In addition to basil, the Herb Society of America has good guides to many other herbs.