It is not necessary to have an outdoor garden in order to grow herbs such as cilantro; it just requires a little extra care if it is grown indoors. Keep in mind that cilantro grown indoors will grow more slowly than when outside, so it is important to pay attention to the soil mixture, watering and sun exposure in order to enjoy this common herb year-round.
Choose cilantro that has not been previously planted in the ground. Cilantro does not transplant well.
Use unglazed terra cotta containers to grow cilantro indoors. This allows more moisture and air to circulate through the herb plant. The container also needs to be well draining, with holes in the bottom of the pot. Add a layer of pebbles over the bottom of the container.
Create the soil mixture by combining equal parts potting soil and sand. Weekly, use a 20-20-20 fertilizer to add extra nutrients to the plant. It is important to provide these nutrients for the cilantro since it is growing indoors.
Start with seeds or starter plants that you purchase from a local nursery, planting them about 3 inches apart in the terra cotta containers with the prepared soil.
Water the plants whenever the soil feels moderately dry to the touch; run water into the plant until the water comes out of the drainage holes in the bottom of the container. In summer months, the plants may need to be watered more often due to the stronger sun the plants are receiving.
Make sure the cilantro gets around 5 hours of full sun per day, so set the plant containers in a sunny windowsill.
Harvest the cilantro carefully, and pinch the growing tips every couple of months in order to encourage a fuller herb plant.