How to Keep Catnip Growing Inside

Plant a catnip seedling in a pot with well-draining potting soil. Use sterile, commercially available potting soil so weeds and other pests do not grow in the pot. Insert the plant into the soil so the roots are covered and the leaves stick out above the soil. Tamp the soil down and water thoroughly, until water runs out the bottom of the pot.

Grow the plant in a location where it will get morning and afternoon sun. In the outdoors, catnip is tolerant of full sun and partial shade. However, it will dry out faster in a pot, so choose a location with a moderate amount of sun.

Water the plant regularly. Do not allow it to dry out. Watering amounts will vary depending on how dry your home is so watch the soil. Water the plant daily in hot, dry conditions, or weekly in a humid environment. Catnip prefers wet, but not waterlogged, soil.

Prune catnip once it reaches 4 inches in height. Cut it back just above the last leaves. This trimming encourages new, bushy growth and keeps it from getting straggly. Prune the plant in this manner every time it grows another 4 inches. Do this throughout the growing season.

Harvest catnip when you first see blossoms by cutting it back 2 inches below the blossoms. Dry the trimmings for your cat to enjoy or for your tea.