Exochorda racemosa

Pearlbush is named for the week before the show rather than the show itself. Along each slender arching branch, the flower buds swell into round, hard, pure white beads strung out in a line, and for a few days in very early spring the shrub looks convincingly like a plant hung with pearls. Then the buds open into cupped white flowers an inch or so across, six to ten of them to a raceme, and the whole irregular upright frame of eight to ten feet goes white at a point in the year when almost nothing else has started. The plant is sure to attract attention in flower, and does very well in the South, where pearlbush is a dependable herald of spring.

The genus name is an odd and rather good one, built from the Greek exo, outside, and chorde, a cord, for the fibrous strands that sit outside the placenta in the ovary, which is the sort of detail only a botanist with a hand lens would ever have chosen to name a plant after. Gardeners went with pearlbush instead. Exochorda belongs to Rosaceae, the rose family, in the company of spiraea and physocarpus, and the species came into Western gardens from China in the middle of the nineteenth century. The native range runs across China and Central Asia.

There is no ethnobotany to report here, no medicine, dye or food use of any consequence; pearlbush has always been an ornamental and nothing else. The flowers draw early bees at a moment in the year when forage is thin, which is a quieter argument for the plant than the bloom but a real one. Autumn colour is negligible and the summer foliage is plain, so this is a shrub that earns a season and then steps back, best sited where something else takes over later.

Plant pearlbush in well-drained soil in full sun or part shade; the shrub tolerates a wide range of conditions and shrugs off heat and drought once established. Give room for the arching habit and prune straight after flowering, since next spring's buds form on old wood, and take out a proportion of the oldest stems at the base every few years to keep new growth coming rather than shearing the outline. Hardy through USDA zones 4 to 8. One honest caution, and it is our own observation rather than anything from a book: pearlbush naturalizes sparingly here in Aiken, so keep an eye out for seedlings near woodland edges if you garden where that matters.