Douglas Aster

Growing Douglas Aster

Adaptable to wet or average soil and a key fall nectar source west of the Cascades. Spreads modestly to fill a border.

Where it belongs

Douglas aster is native to the Pacific Northwest, west of the Cascades and along the coast, growing in wet meadows, on stream banks, in ditches, and at the edges of coastal marshes and prairies.

It matters regionally in a way that is easy to miss from outside. Most published native plant advice is written for the East and the Midwest, where New England aster is the standard fall species. West of the Cascades that plant is not native, and this is the aster that belongs there.

Growing it

Full sun to part sun, medium to wet soil, in loam or clay, zones 4 to 8. Two to four feet.

It handles the region's conditions directly: wet winters, dry summers, and heavy soil. It tolerates both average garden ground and genuinely wet spots, which makes it one of the reliable choices for a rain garden west of the mountains.

It spreads modestly by rhizome and fills a border over a few seasons without becoming a problem. Pull the outer edge in spring if it goes further than you want.

In rich soil it can grow tall and lean. Cutting the stems back by half in early June produces a shorter, denser plant and slightly later flowers.

What it feeds

Bloom runs from August into October, and in the Pacific Northwest that period carries particular weight. The dry summer ends and the rains start, and much of what flowered earlier is finished.

Bumblebees are the main visitors, and this is the point in the year when new queens are feeding heavily before overwintering alone. Whether they go into winter well fed determines whether there are colonies the following spring.

Native solitary bees, hoverflies, and butterflies work it as well, including late-season painted ladies and woodland skippers. Small birds take the seed through the winter.

Living with it

Deer will browse it where pressure is high.

Buy it from a nursery that specializes in Northwest natives. Aster taxonomy is tangled, common names are applied loosely, and eastern species are widely sold in the region under generic labels.

Leave the stems standing over winter for the seed and for the insects sheltering in them, and cut back in spring.

Sources: USDA PLANTS Database (native range and nomenclature); Washington Native Plant Society and Oregon State University Extension (regional species selection); Xerces Society (late-season bumblebee forage and overwintering queens).

It’s easy to grow, and showy.

Where it grows

Douglas Aster is native to the Pacific Northwest. In the wild you’ll find it across California · Idaho · Montana · Oregon · Washington. Always confirm it suits your specific county with your state native plant society before planting.

Regional Garden has written state guides covering Douglas Aster in 5 of them so far.

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