Astilbe 'WASHINGTON' astilbe (japonica group)

Washington astilbe is as iconic as the White House in the US capital of the same name (plus the D.C., obviously). Elegant yet ostentatious, tall enough not to be overlooked but not so much to overshadow its surroundings, and pure in colour like the endeavour of anyone who swears an oath to his country there every four years. Its flowers are creamy white and arranged in rich, erect and loose plumes typical for japonica group hybrids. They are held atop 50-60 cm tall, light green stems above medium green leaves. They are deciduous, divided, serrated at margins, and healthy.

Grow astilbe in humus-rich soil. If planted in boggy or regularly watered bed they can sit in full sun, too, otherwise choose a semi-shaded or shaded location. They are water loving plants and require a good dose of nutrients to look their best. They will not grow in chalky or clay soil that dries out in summer.

For best results divide the clumps every 3-4 years removing old and dead rhizomes in early spring. Also in the spring remove old leaves and last year’s flowers. If grown in poor soil you may need to cut back the entire plant after flowering to get rid of spent stems and tired foliage in order to encourage growth of new leaves. A dose of a liquid fertilizer is recommended. Fully hardy to about -34°C (USDA zone 4).

Last update 02-07-2023