Location

Find the brightest spot with good air circulation in your home when growing herbs indoors.
Herbs, to grow well, prefer 5-8 hours of direct sunlight daily.
A southwestern-facing window is your best bet, if you have a South or West facing window you are in luck. An East facing window can be good as well.
Herb plants, if not receiving enough sunlight will remain unproductive and show the leggy and awkward growth.
Try your luck with shade-tolerant herbs like parsley, mint, lemon balm, chives, etc.

Container

While selecting the pot, the size of the container is also an important consideration. Pot size mainly depends on the root system of the herbs.
Shallow root herbs that can grow in 6 inches deep small pots are chives, thyme, oregano, tarragon, and parsley.
Deep root herbs you can grow in 8 inches deep large pots are basil, cilantro, summer savory. Herbs like rosemary, mint, dill, and lemongrass require at least 10 inches deep pots.
Select some colorful pots to give an aesthetic appearance indoors. You can also reuse old tins and cans and transform them into unique planters.
Invasive herbs must be planted separately. Herbs that prefer more sunlight and dry soil must not be planted with shade-loving herbs.

Sunlight is optimal and a south west facing window is best.
If sunlight is not enough, you can also use normal CFL bulbs as a supplemental light source to grow herbs.
Place herbs 5-6 inches away from the light source, for every one hour of sunlight, provide two hours of fluorescent light. If your plant is completely relying on the artificial light source, provide 14-16 hours of light to it.
The CFL bulb must cover the entire plant, you can adjust the number of bulbs accordingly.
From 3 common color temperatures–warm white, cool white, and daylight or natural, choose daylight color CFL. Daylight color bulbs are more bluish and brighter and as we know plants prefer blue spectrum light for vegetative growth, they are perfect.

Although some herbs can tolerate temperature up to 100 F (38 C) and down to 40 F (4 C), it’s best to keep the room temperature between 60-80 F (15-27 C). Not letting it go up above 90 F (32 C) for those who live in a hot climate, and down below 50 F (10 C) for those who live in a cool climate.
Keep your indoor herbs away from cold drafts and heat vents.
Growing herbs indoors is fruitful in winters, this way you can grow them year round. It’s a practical idea for those as well who lack the gardening space.
If growing herbs near the window, do not let them come in contact with the window glass as it becomes very cold in winters.
Some herbs such as basil and marjoram are sensitive to cold, their leaves start to fall, wilt or show discoloring if they are exposed even a bit to the cold drafts. So do not open window, if these herbs are placed nearby that window.

Soil mix plays a most important role in the drainage factor. Especially in case of indoor herbs, the soil should have additional drainage, so before selecting any potting mix do check the label that it is suitable for indoor plants.
The potting mix will have drainage according to the perlite present in it. You can add perlite to the soil improve its drainage.
Do not use normal soil from the ground in your potting mix, it is very compact and your plant roots will not have room to breathe if planted in it. You can prepare the potting mix according to the need of the specific herb. For example, add a little extra peat for moisture-loving herbs such as mint or parsley, whereas for Mediterranean herbs, add some sand as they prefer the soil to be somewhat drier.
At the time of planting, you can add 1/3 part of compost or well-rotted cow manure to improve the texture and nutrient composition of potting mix.

Fertilize your indoor herbs lightly. Fertilizing more often may increase the growth and lushness of your herb plants but dilapidates their aroma and taste.
Fertilize every 2-3 weeks in low strength. Use a general-purpose liquid fertilizer. For more organic approach, feed the herbs with fish emulsion or liquid seaweed fertilizer.
If you don’t want to use fertilizer, spread one or two handfuls of compost or well-rotted manure over the topsoil of potted herbs in every 2-3 months.

Herbs are known to die more from overwatering than underwatering. So make sure that you manage your watering spells in a way that the soil does not turn soggy or overly wet.
The soil dries from top to bottom so don’t fret if the topsoil is dry, it can still be moist underneath. The best way to check if the plant needs watering is by inserting your finger in the topsoil. Water the pot when you find soil is dry two inches below the surface.
Another point to take into account is watering slowly. Soil needs time to absorb water, so if you water at a high pace, it will start draining out from the bottom without soil actually getting a chance to absorb it.
Watering is required 2-3 times a week and may vary slightly depending on the size of the pot, weather, humidity conditions, temperature, your climate and the type of herb of you’re growing.
When growing herbs indoors, it’s better to keep them on a drier side and treat them as a houseplant.