How to Grow Herbs Indoors (US Guide)

What indoor herbs actually need

Indoor herb growing comes down to three variables: light, drainage, and harvesting habits. Get these right and most culinary herbs thrive on a kitchen windowsill. Get any one wrong and the plant declines within weeks.

Light is the most misunderstood variable. Most kitchen windows in US homes receive less direct sun than herb plants need, especially in winter. A north-facing window receives almost no direct sun and will not support most herbs. East windows get 2–3 hours of morning sun — acceptable for chives and mint but not for basil, rosemary, or thyme. South and west windows are the minimum for most culinary herbs.

The good news: LED grow lights are inexpensive, use minimal electricity, and extend the growing season year-round regardless of window position or season.

Which herbs grow well indoors

Starting herbs indoors: seeds vs. transplants

For most home herb gardeners, buying transplants from a garden center is faster and more reliable than starting from seed. Most herbs take 3–6 weeks from seed before they can be harvested — transplants are productive within a week of purchase.

Start from seed when:

• You want a specific variety not available as transplants (specialty basils, variegated thyme)
• You are growing a large number of plants and cost matters
• Cilantro is the goal — it does not transplant well and is best direct-seeded

Buy transplants when:

• You want to harvest quickly
• You are growing one or two plants of each herb for kitchen use
• Basil is the goal — grocery store basil pots can be divided and repotted successfully at much lower cost than dedicated herb transplants

Grocery store herb pots: The herb plants sold in supermarket produce sections are grown at high density and high fertilizer rates for quick sale, not long-term production. Separate them into individual 4-inch pots with fresh potting mix immediately after purchase. Each cluster contains 5–12 individual seedlings that will grow into productive separate plants once given space and better drainage.

Containers and soil for indoor herbs

Use pots with drainage holes. This is non-negotiable. Water sitting in the bottom of a sealed pot creates anaerobic conditions that destroy roots within days.

Pot size guidelines:

• Single herb, kitchen use: 4–6 inch pot
• Multiple herbs together: 8–12 inch wide container
• Mint (aggressive spreader): give it its own 6-inch or larger pot

Potting mix: Use standard all-purpose potting mix for most herbs. Avoid garden soil, which compacts in pots and drains poorly. For rosemary and thyme, add 20–30% perlite to improve drainage — these Mediterranean herbs need fast-draining conditions.

Do not use potting mix labeled “moisture-retaining” for herbs. These mixes stay wet too long and promote root rot.

Saucers: A saucer is fine for catching drips, but empty it 30 minutes after watering. Do not leave pots sitting in standing water.

Light requirements for indoor herbs

Most culinary herbs evolved in the Mediterranean basin or tropical regions with 8–12 hours of direct sun. US homes rarely provide this. Supplemental grow lights solve the problem.

Window positions by light level:

• South-facing window: best natural light; full direct sun for most of the day in summer; 4–6 hours in winter
• West-facing window: afternoon sun; 3–5 hours of direct light
• East-facing window: morning sun only; 2–3 hours direct; adequate for mint and chives
• North-facing window: no direct sun; suitable for leafy greens but not most herbs

Grow lights: LED grow lights with a color temperature of 5000K–6500K provide the spectrum range herbs need. A 20–40W LED panel positioned 6–12 inches above the herb pots on a 14–16 hour timer replaces adequate window light. Clip-on grow lights start around $20–$30 and handle a standard windowsill herb collection.

Signs of insufficient light: yellowing lower leaves, elongated pale stems, leaf drop. These symptoms appear 2–4 weeks after light becomes inadequate.

Watering indoor herbs correctly

The correct watering frequency for indoor herbs depends on the herb type, pot size, light level, and indoor temperature. The universal rule: let the top 1 inch of soil dry before watering most herbs. Let the top 2 inches dry before watering rosemary and thyme.

Test moisture before watering. Push a finger 1 inch into the soil. If it feels damp, do not water. If it feels dry, water thoroughly until water runs through the drainage holes.

Mediterranean herbs (rosemary, thyme, oregano, sage) need the soonest soil surface dry before the next watering. These plants evolved in rocky, fast-draining soils and have no tolerance for wet roots. Water them less frequently than the label suggests in most US indoor environments.

Tropical herbs (basil) need more consistent moisture. The soil surface can dry between waterings, but basil wilts visibly when too dry. It recovers quickly from brief drought but does not tolerate prolonged dryness.

Mint and parsley sit between these extremes — moderately moisture-tolerant but not suited to the very dry conditions rosemary prefers.

In winter, indoor heating reduces humidity and increases the rate at which herbs dry out. Water needs increase compared to humid summer conditions.

Harvesting to keep herbs productive

Regular harvesting keeps herbs in vegetative growth. Herbs that are not harvested bolt — they shift energy to flower and seed production, which reduces leaf quality and flavor, and shortens the plant’s productive life.

How to harvest without harming the plant:

• Never remove more than one-third of the plant in a single harvest
• Cut above a leaf node (the junction where leaves attach to the stem), not at the base of the stem
• For bushy herbs like basil and mint, cut the top 4–6 inches; the plant branches from the cut and produces more growth

Pinching flowers: Remove flower buds as they appear on basil, cilantro, and mint. Flowering diverts energy away from leaf production. A plant allowed to flower and set seed often declines rapidly afterward. This is especially true for cilantro, which bolts quickly in warm conditions.

For basil, pinching the central growing tip when the plant is 6 inches tall encourages branching and produces a bushier, more productive plant. See how to grow basil for step-by-step basil production guidance.

Common indoor herb problems and fixes

Yellowing leaves: The most common cause is overwatering and root rot. Check drainage holes and reduce watering frequency. Other causes: insufficient light, nitrogen deficiency after several months in the same soil.

Leggy, pale growth: Insufficient light. Move the plant to a brighter window or add a grow light.

Wilting despite moist soil: Root rot from overwatering. Remove the plant from its pot and inspect the roots — brown, mushy roots confirm rot. Trim affected roots, repot in fresh dry soil, and reduce watering.

Sudden leaf drop on basil: Cold temperature exposure. Basil is extremely cold-sensitive — drafts from windows or air conditioning below 55°F cause rapid leaf drop. Keep basil away from cold air sources.

White crusty deposit on soil surface: Mineral salt buildup from tap water and fertilizer. Flush the pot thoroughly with water once a month or repot annually with fresh mix.

Fertilizing indoor herbs

Herbs grown for culinary use need moderate fertility. Heavy fertilizing produces fast, lush growth with reduced flavor concentration — the aromatic oils that make herbs useful in cooking are partly a response to moderate stress, not ideal conditions.

Apply a half-strength liquid fertilizer (balanced NPK, such as 10-10-10) once monthly during the growing season. Do not fertilize in winter unless plants are under grow lights and actively growing.

For herbs in their original potting mix, no fertilization is needed for the first 3 months. Potting mixes include slow-release fertilizer that feeds the plant for approximately 90 days.

Growing mint indoors

Mint deserves separate treatment because its growth habit is unlike other herbs. It spreads aggressively via underground runners and will overtake any other plant sharing its pot. Grow mint alone in a 6-inch or larger pot, and cut it frequently.

Mint tolerates lower light levels than most herbs, making it the best choice for east-facing windows or rooms with limited natural light. It prefers consistent moisture — let the top ¼ inch dry before rewatering, but do not let it wilt completely.

Varieties suitable for kitchen use: spearmint, peppermint, apple mint. Mojito mint is widely available and productive. Chocolate mint is a novelty variety with pleasant flavor. All grow similarly indoors.

See our how to grow cilantro guide for techniques on managing the other fast-to-bolt kitchen herb alongside a windowsill herb collection.

Setting up a kitchen herb garden

A practical indoor herb setup for most US kitchens:

1. Position a 6-inch south or west windowsill with maximum sun exposure.
2. Place three to four 4-inch pots: basil, chives, parsley, and mint (mint in its own pot).
3. Add a clip-on LED grow light above the pots for December–February.
4. Water when the top inch of soil dries; empty saucers 30 minutes after watering.
5. Harvest from each plant weekly, taking no more than one-third of growth.

This setup provides year-round culinary herbs within arm’s reach of the stove. For additional variety, add rosemary and thyme in a separate west-facing window where they can receive more direct afternoon light.

For companion planting strategies when these herbs move outside for the summer, see companion plants for peppers and companion plants for carrots — most kitchen herbs do double duty as companion plants in outdoor vegetable gardens.