asters
From early October until the end of the month, aromatic aster shrugs off frosts and even a few hard freezes. At 2 feet tall and wide, sometimes a bit wider, Aster oblongifolius is the last nectar pit stop for migrating and overwintering insects like bumblebees, monarchs, red admirals and sulphurs. Dry, hot, nasty soil is its preferred home, being native from the high Plains to the East Coast. It's probably one of the more adaptable asters, and I use it as a small perennial shrub, especially the cultivar 'October Skies'.
On the right here is Aster laevis, called smooth aster for its smooth leaves. At about 2 feet tall and wide, it's certainly stiff competition with New England aster for the biggest insect draw among asters. Blooming in late September to early October, smooth aster likes a medium soil in full sun, and is one of the easier asters to start from seed. It's also native to most of the U.S. Plant something else underneath it, since (like New England aster) its legs tend to die out and look ratty.
You all know New England aster (Symphyotrichum novae-angliae) I'm sure. Native to most of the central and eastern U.S., it reaches 2 feet wide and 3 to 5 feet tall — shorter if in medium soil; taller if in moist. It's a late-September to early October bloomer; the more sun it gets, the more flowers a myriad of insects and butterflies can enjoy. Cut it back by 50 percent before July 4 to have a bushier, shorter, bloomier plant.
White woodland aster (Aster divaricatus) is native to the East Coast and takes dry soil in full shade (the common name is a giveaway). It blooms about the same time as A. azureus, so it's nice to have both plants — one blooming in sun, one in shade. It reaches about 12 to 18 inches tall and wide, and looks great massed in groups of three.
Next is my new favorite, the late-August to early September sky blue aster (Aster azureus). A dry-soil-loving, full-sun bloomer, it gets about 3 feet tall and 1 foot wide. I actually think it's one of the brightest asters out there. It's native to the eastern Plains and central Midwest, roughly along the Mississippi and then to two states east and west. Because of its small footprint and wiry stems, I tuck it in wherever I can — come bloom time, I'm always surprised to see those iridescent flowers shining above long-silent summer perennials.
he first aster for me each year is an early to mid-August bloomer, big-leaf aster (Aster macrophyllus, or Symphyotrichum macrophylla if you've made the switch to the new Latin). It likes partial sun to shade in soils from dry to wet, getting about 12 to 18 inches tall and slowly creeping around. It's native to the Great Lakes, New England and eastern Midwest. The good thing about this perennial is that it keeps its petals a long time; for me it makes a great front-of-the-border splash.
So there you go: asters blooming from August through October, and if you're lucky into early November depending on your zone. If you want you can cheat and also plant false aster, or Boltonia, pictured here, which for me flowers in early to mid-September. It's a cloud-like perennial topped with hundreds of white frisbees that gets about 4 feet tall and 3 feet wide in full sun with medium soil. Please note that all of my bloom times are based on zone 5 here in eastern Nebraska. And also note that I cut myself off with this plant list — there are at least three times as many asters that I could tell you about. I just love asters and the fall garden! (In fact, I'd say about a third of my garden blooms in fall.) October and even November are the perfect times to get digging, seeing where you could use some fall flowers and giving them a head start for summer growth.
Q