How to Grow Basil Indoors Year Round

Growing basil indoors requires a sunny windowsill or grow light, well-draining soil, and regular pinching of flowers to keep leaves tender and flavorful throughout the year.

1. Pick Compact Varieties First. Start with compact varieties like Genovese, Greek, or dwarf basil that thrive in containers. These varieties stay smaller and bushier than their outdoor cousins, making them perfect for indoor growing. Pick up seedlings from a nursery or start from seed if you have patience for the 7-14 day germination period.
2. Maximize Light Sources. Place your basil near a south-facing window that gets at least 6 hours of direct sunlight daily. If your windows don't provide enough light, especially during winter months, supplement with a full-spectrum LED grow light positioned 6-12 inches above the plant. Run the grow light for 12-16 hours daily to mimic summer conditions.
3. Choose Proper Drainage. Plant basil in a pot at least 6 inches deep with drainage holes. Use a high-quality potting mix that drains well but retains some moisture. Avoid garden soil, which becomes too heavy and doesn't drain properly in containers. A mix designed for herbs or vegetables works perfectly.
4. Balance Moisture Perfectly. Keep soil consistently moist but never soggy. Water when the top inch of soil feels dry to the touch, usually every 2-3 days depending on humidity and temperature. Water at the base of the plant rather than on the leaves to prevent fungal issues. Empty any standing water from saucers after 30 minutes.
5. Control Climate Conditions. Keep your basil in temperatures between 65-75°F during the day and no lower than 60°F at night. Avoid placing plants near heating vents, air conditioners, or drafty windows. If your home is dry, especially in winter, place a humidity tray filled with water and pebbles beneath the pot to increase moisture around the plant.
6. Pinch Before They Bloom. Pinch off flower buds as soon as they appear to keep leaves tender and prevent the plant from going to seed. Harvest leaves regularly by pinching stems just above a pair of leaves, which encourages bushier growth. Start harvesting when the plant has at least 6 sets of leaves, typically 4-6 weeks after planting.
7. Fertilize With Restraint. Apply a balanced liquid fertilizer diluted to half strength once a month during the growing season. Over-fertilizing can reduce the intensity of basil's flavor, so less is more. If leaves start yellowing from the bottom up, this usually indicates the plant needs nutrients.