New York ironweed

New York ironweed can be watered during its active growth, roughly from spring to fall. These plants should be watered deeply, approximately 1-2 inches of water, 2 times per week. However, if the weather is unusually dry or hot, this frequency may need to be increased. Ensure that the soil around the plant is completely saturated with water, to the depth of 5-6 inches. During winter months, it is not necessary to water New York Ironweed, as the plant will go dormant. Be sure to monitor weather patterns and supplement with water only during dry periods.

New York ironweed (Vernonia noveboracensis) prefers full sun to partial shade, but, depending upon its location, it can tolerate some shade. The optimal amount of sunshine for this plant species is 6 to 8 hours of direct sunlight per day. It prefers warmer temperatures and can tolerate cooler areas, as long as it is exposed to appropriate amounts of sunlight throughout the day. It is best grown in moist soils with good drainage. Though it prefers full sun, it can tolerate some shade during midday when the temperatures are highest.

New York ironweed (Vernonia noveboracensis) does not require much pruning. It is best to wait until the blooming period in the summer is complete and new growth appears in the fall. Dead or diseased stems should be trimmed to the ground or to healthy buds. Encouraging branching by cutting the stem tips back by 1-third during the fall season may also benefit the plant's appearance and growth. New York ironweed (Vernonia noveboracensis) should not be pruned more than once a year and should not be cut back beyond 1-third of the total stem length.