To grow well indoors, herbs need as much natural light as possible. Place them in a sunny spot near a window where they’ll get at least 4 hours of sun daily. Windows that face south or southwest are your best shot at sun, though east- or west-facing windows also will do. North-facing windows are not bright enough.
If you’re not sure whether a spot gets enough light, try this test. On a sunny to partly sunny day, turn off all lights and periodically check on the natural sunlight. How much sun does the spot get throughout the day? Check it before start your indoor herb garden.
The best way to ruin a tabletop or windowsill is to let a potted plant drain on it. Likewise, the best way to ruin most herbs is to let them sit in water so the roots will rot. Be sure to use a saucer, liner, or drain pan under the pot to catch water and protect your surface. A clay saucer lets moisture pass through, so opt for plastic, rubber, or metal instead.
Clay pots help with drainage, but they can dry out quickly. If you live in a dry climate or are growing herbs indoors during winter, when furnace heat causes homes to get especially dry, try a glazed or plastic container that won’t try out as quickly as clay.
Many cooks grow herbs indoors during the winter when it’s too cold outside or too wet to dig in the dirt, but you can grow herbs inside any time of year. Indoor herbs prefer the same temperatures that most people do—around 65 to 70 degrees F—so if you’re comfortable, they probably are. At night, temperatures near a window may drop to 55 or 60, but most herbs like that, too. Keep foliage from touching glass to protect from getting nipped by cold.
Basil is trickier. Many kitchen gardeners yearn for basil in their indoor garden. If you have plenty of sun and warmth indoors, basil should thrive, but don’t keep it on a cool windowsill. Basil leaves will droop and fade after a short time in cool air. It prefers indoor temperatures in the 70s day and night.
Remember that the air next to a window will be cooler in winter (or hotter in summer) than your average indoor temperature, so adjust your plants accordingly. Dry air, whether from air conditioning or heating, is hard on most herbs, so if you can give them a weekly shower in the sink, they will be happier. It is good to have indoor herb garden.