For indoor pot-planting herbs, make sure that you choose a pot that has holes in the bottom for good drainage. If your pot does not have holes, place 2-3 inches of glass beads or rocks in the bottom of the pot before planting. This will help water darin out from the bottom of the soil.
Next, make sure to buy a high-quality potting soil or soil-base compost with added fertilizer. Fill your pot approximately three quarters of the pot's depth. Place the herb plants into the pot, with about 15cm between each stem. Squeeze each gerb gently from it's temporary pot, and tease the roots from the root ball; this will encourage them to spread out. Fill in the gaps between plants with your soil or compost. Firmly push the compost into the gaps by pushing your fingers deep into the soil that you have just added, being careful not ot damage any roots. Leave a couple of centimeters between the pot's rim and the soil, so that the pot does not overflow when you water it.
Remember herbs like lots of sun! If planting herbs indoors, place the pot by a south or west window best. Herbs can take a strong light coming in through a window. Also, herbs should be transplanted into bigger pots after each season, i.e., each spring when you put them outside. Warning-be careful in winter. Putting an herb right on the windowsill is dangerous because it will get too cold. Your herb should be on a table or something where the sun hits it but it doesn't get too cold.
For growing herbs outside, choose a sunny place, especially when the weather is cooler. For tender herbs like basil, avoid strong western full sun all day. For example, herbs in Utah grow well in a Northwest location, with sun from about 2:00 P.M. on.
Water potted herbs every day in summer. Give them a good soaking. In the ground, lawn sprinklers will work, or drip system daily.
Wheter planting indoor or out, feed herbs a fertilizer with higher nitrogen. Fertilizers have three numbers on their labels, indicating the balance of Nitrogen, Phosphorus, and Potassium, or, NPK. For example, take Proven Winners granular fertilizer with a balance of 12-8-6. It's slow release, so the plants absorb it as the summer progresses and take off about 3 to 4 weeks after application.