great ironweed

Great Ironweed prefers moist, well-drained soil and should be watered regularly to keep the soil moist but not soggy. During the hotter months, water the plant about once a week, making sure to thoroughly soak the soil (about 1 inch of water) to reach the plant's deep roots. In cooler months, water once every 2 weeks. Make sure to water near the base of the plant and not on the foliage to prevent disease. Avoid over-watering, as this can lead to root and fungal disease.

Great Ironweed (Vernonia arkansana) prefers full sun to light shade exposure and needs 6-8 hours of direct sunlight to thrive. To maximize its growth, the plant should be in an area that receives direct sunlight during the morning and midafternoon hours to benefit from the maximum amount of direct sunlight. Avoid planting in locations where the sun will be blocked by buildings or trees. During its peak blooming season from late summer to early fall, give the plant up to 12 hours of direct sunlight, providing enough energy and light to stimulate the formation of its purple buds and vibrant blooms.

Great ironweed (Vernonia arkansana) should be pruned during late winter or early spring to maintain its shape and encourage new growth. Prune the plant back by up to 1/3 of its height, cutting just above an outward-facing bud. This will encourage fuller and bushier growth. To help promote more blooms, prune off the dead flowers throughout the blooming season. Additionally, you can also prune off any dead or damaged branches during the dormant months as needed.