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On a bright late summer day, the purple flowers of ironweed glow. Ironweeds can take their place in sunny moist beds and borders, rain gardens, and beside ponds and streams. In limited space, cut the stems by half in early summer to control height. They are magnets for butterflies.
From 1 to 20 feet
2-3 feet wide, depending on variety
plant Ironweed with
Joe Pye weed is a showstopper of a prairie native, producing huge, puffy flower heads in late summer. It prefers moist soils, but with its extensive root system, it also tolerates drought well. It is a large plant, growing 4 to 6 feet tall.Closely related, hardy ageratum is a spreading plant that grows to only 2 feet tall. Another relative, white snakeroot, reaches 4 to 5 feet tall. All are great for naturalistic or cottage plantings and for attracting butterflies.
A big, bodacious, beautiful plant, perennial sunflower is imposingly tall and floppy with large (up to 4-inch), bright yellow flowers that form in loose clusters. Most of these natives thrive in full sun and are not fussy about soil. The taller ones may need support. Excellent for cut flowers.
Asters get their name from the Latin word for "star," and their flowers are indeed the superstars of the fall garden. Some types of this native plant can reach up to 6 feet with flowers in white and pinks but also, perhaps most strikingly, in rich purples and showy lavenders.Not all asters are fall bloomers. Extend the season by growing some of the summer bloomers, as well. Some are naturally compact; tall types that grow more than 2 feet tall benefit from staking or an early-season pinching or cutting back by about one-third in July or so to keep the plant more compact.