Andrographis paniculata is an erect, annual herb which grows naturally in India. This herb grows 1 to 3 feet tall and is a popular medicinal ingredient. Andrographis paniculata needs 90 to 100 days of hot, humid weather to grow to its full maturity. The majority of the harvest comes from wild plants, but people cultivate it as well. Providing the right environment for the plant will help you grow this useful herb.
Find an area with moderately fertile soil and shade or part sun. This plant grows in a wide variety of soils and in a wide variety of climates. Start the planting process in the spring, immediately after the danger of frost passes and the ground can be worked.
Till the soil with a rototiller, digging in 2 to 4 inches of organic manure to increase nutrient content. Tamp down the soil, making a compact, flat surface for the seeds.
Lay the seeds down, spacing them 6 inches apart in rows 12 inches apart. Sprinkle a thin layer of soil mixed with organic compost on top of the seeds so they are just covered. Place a 1-inch layer of mulch on top of the seeds.
Water the seeds deeply and regularly, keeping them moist for 6 to 7 days while germination occurs. When the seedlings poke through, clear the mulch away to allow them to grow properly.
Water the Andrographis paniculata whenever the soil feels slightly dry. Apply a fertilizer marked 10-5-5 after vigorous growth begins and once a month during the growing season. Follow the directions on the package for application instructions as each brand will differ.
Harvest the plants when they flower by cutting them off 4 to 6 inches from the ground. In warm climates, the plant will regenerate and you will get a second harvest 50 to 60 days after the first.