Growing herbs indoors: which window you need and which herbs actually work

The supermarket sells you a pot of basil. You put it on the kitchen counter. Three weeks later it is leggy, dropping leaves, and starting to smell musty. You assumed the failure was skill. It was location. Basil needs at least 6 hours of direct sunlight per day. A kitchen counter, even in a well-lit kitchen, almost never delivers this. The window direction matters more than the herb variety, the pot, the soil, or the watering schedule.

The honest light requirement for herbs

Most culinary herbs are Mediterranean or tropical plants adapted to strong, direct sun. Outdoors in a garden bed or on a sunny patio they thrive because they get 8 or more hours of direct sun naturally. Indoors, replicating that is genuinely difficult unless you have the right window.

The minimum for most productive herbs is 6 hours of direct sunlight per day. In the northern hemisphere, only south and west-facing windows consistently deliver this indoors, and only when the plant is positioned directly on or very close to the sill. A few herbs tolerate less and can grow in east windows or with indirect light, but these are the exceptions.

If you are unsure which direction your kitchen window faces, the window direction guide covers three fast methods.

Herbs by window direction

South-facing window (best for herbs)

A south window gets the most hours of direct sun of any indoor exposure. On the sill of a south window, most herbs will produce as well as they would in a garden bed. This is the window for basil, rosemary, thyme, oregano, and sage.

• Basil Ocimum basilicum Needs 6+ hours direct sun. South sill only. Pinch flower buds to keep leaves coming. Very cold-sensitive.
• Rosemary Salvia rosmarinus Needs maximum sun and excellent drainage. One of the best long-term south-window herbs.
• Thyme Thymus vulgaris Low-water Mediterranean herb. Does extremely well on a south sill; tolerates some drought.
• Oregano Origanum vulgare Grows vigorously in full sun. South window produces the concentrated flavor that makes it worth growing.
• Sage Salvia officinalis Woody perennial that does well in strong light and dry conditions. Good long-term container plant.
• Lemon verbena Aloysia citrodora Needs maximum light to produce the intense citrus fragrance. South window is the right home.

West-facing window

A west window delivers strong afternoon sun. Most of the same herbs that do well in a south window also work in a west window, though growth is slightly slower due to the shorter direct sun window. The afternoon heat can stress basil in summer; set it back slightly from the glass or shade it briefly on the hottest days.

• Basil Ocimum basilicum Works in a west window in spring and autumn. In summer, afternoon heat can cause stress; watch for wilting.
• Chives Allium schoenoprasum One of the most productive windowsill herbs. West light gives good yield; also tolerates east.
• Parsley Petroselinum crispum More shade-tolerant than most herbs. West window produces good leaf growth.
• Thyme Thymus vulgaris Handles afternoon sun well. West window suits it nearly as well as south.

East-facing window

An east window delivers gentle morning sun and indirect light for the rest of the day. Most culinary herbs produce more slowly here, but a handful genuinely work. Do not expect basil, rosemary, or thyme to thrive long-term in an east window, but these do:

• Mint Mentha spp. The most shade-tolerant culinary herb. Grows in east light, though more slowly than in full sun. Keep in its own pot; it spreads aggressively.
• Chives Allium schoenoprasum Tolerates east light reasonably well. Harvest regularly to keep new growth coming.
• Parsley Petroselinum crispum Grows in east light though more slowly. Flat-leaf parsley is typically more productive than curly in lower light.
• Lemon balm Melissa officinalis Handles indirect light better than most Mediterranean herbs. East window produces decent leaf growth.

North-facing window

A north window is not suitable for productive herb growing. The light is too low for culinary herbs to produce harvestable amounts. Mint can survive in a north window but will grow slowly and have poor flavor concentration. If a north window is your only option, use a grow light placed 4 to 8 inches above the plants and run for 14 to 16 hours per day. This genuinely works and is the right solution for north-facing kitchens.

Why supermarket herb pots fail

Supermarket herb pots contain dozens of seedlings crammed into a small pot, grown quickly in optimal greenhouse conditions. When you bring them home, several things happen at once:

1. The light drops dramatically from greenhouse levels to whatever your kitchen window provides.
2. The many seedlings compete for the limited nutrients in the small pot.
3. The pot typically has poor drainage, and roots sit in excess moisture.

The fix is to split the pot. Take the whole root mass out, divide it into three or four sections, and pot each section into its own 4 to 6 inch pot with fresh herb or vegetable potting mix and drainage holes. This gives each plant room to root properly. Then position the pots directly on your sunniest windowsill.

Watering herbs indoors

Most herbs, especially Mediterranean ones (basil, rosemary, thyme, oregano, sage), prefer to dry out slightly between waterings. The most common way to kill them indoors is to keep the soil consistently wet. Water when the top of the soil is dry to the touch, water thoroughly until it drains from the bottom, then let it dry again.

Mint and parsley prefer more consistently moist soil. Check them more frequently in summer.

Pots without drainage holes are a significant risk for any herb. If your decorative pot has no drainage, either pot the herb in a smaller plastic pot with holes inside the decorative one, or water sparingly and check frequently.

Harvesting to keep herbs producing

Regular harvesting encourages more leaf production. For basil: pinch off the top two sets of leaves whenever stems are 6 to 8 inches tall, and remove any flower buds as soon as they appear. Once basil flowers (bolts), leaf production slows and flavor declines. For mint and chives: cut stems back to about 2 inches above the soil; they regrow quickly from the base. For rosemary, thyme, and sage: harvest the soft new growth at the tips rather than cutting into old woody stems.

Frequently asked questions