How to Grow Herbs Indoors: Fresh Basil and Mint Year-Round
Grow fresh herbs indoors all year with the right light, containers, and watering. Basil, mint, chives, and rosemary growing guides with common problem fixes.
Fresh herbs bought at grocery stores cost 2 to 4 dollars per small bunch and lose 50 percent of their volatile aromatic compounds within 24 hours of harvest. Growing your own herbs indoors produces fresh cuts on demand and saves the average household 300 to 500 dollars annually. A windowsill herb setup costs under 30 dollars to establish and begins producing usable harvests within 3 to 4 weeks.
Light Requirements for Indoor Herbs
Light is the single most limiting factor in indoor herb growing. Most culinary herbs are Mediterranean in origin and evolved in high-intensity sunlight environments. Basil requires a minimum of 6 hours of direct sun or 12 to 14 hours of grow light to produce the essential oils that give it flavor. South-facing windows in the northern hemisphere receive the most light year-round.
- South-facing window: best for basil, rosemary, thyme, and oregano
- East or west-facing window: adequate for mint, chives, and parsley
- North-facing window: insufficient for most herbs without supplemental grow lights
- Full-spectrum LED grow lights at 2000 to 3000 lumens replace natural light effectively
Choosing Containers and Soil
Herbs require excellent drainage to prevent root rot. Terra cotta pots are ideal because their porous walls allow excess moisture to evaporate through the sides. A 6-inch pot holds enough soil for one basil plant or three chive plants. Mint is invasive and grows more vigorously when confined to its own pot rather than shared with other herbs.
Use a lightweight potting mix with added perlite at a ratio of 3 parts potting mix to 1 part perlite. Standard potting soil without perlite holds too much moisture for rosemary and thyme, which prefer to dry out between waterings. Basil tolerates more consistent moisture and performs well in standard potting mix without modification.
Herb-Specific Growing Guides
Basil is a warm-season herb that dies below 50 degrees Fahrenheit. Keep it away from air conditioning vents and cold windows in winter. Harvest by pinching stem tips above a leaf node, which causes the plant to branch and become bushier. Removing flower buds as they appear extends leaf production by 4 to 6 weeks.
Mint grows so vigorously indoors that it fills a 6-inch pot completely within 6 to 8 weeks. Dividing the root ball in half and repotting gives you two full plants and reinvigorates growth. Repeat every 2 months.
Watering and Feeding Indoor Herbs
Overwatering kills more indoor herbs than any other cause. The correct watering method is to water thoroughly until water drains from the bottom, then wait until the top inch of soil dries completely before watering again. In low-light winter conditions, herbs may only need watering every 7 to 10 days. In summer near a warm window, every 2 to 3 days may be needed.
- Check soil moisture by inserting your finger 1 inch deep before each watering
- Feed with a diluted liquid fertilizer at half strength every 3 to 4 weeks
- Flush the soil with plain water once a month to prevent salt buildup from fertilizer
- Rotate pots 90 degrees weekly so all sides receive equal light exposure
Troubleshooting Common Indoor Herb Problems
Leggy pale growth with long stems and small leaves indicates insufficient light. Move the plant closer to the window or add a grow light positioned 4 to 6 inches above the foliage. Yellow leaves on basil usually indicate overwatering or nitrogen deficiency. Brown crispy leaf tips on rosemary and thyme indicate the soil is staying too wet between waterings, pointing to poor drainage or excessive watering frequency.