Hesperis White (Sweet Rocket)

Hesperis matronalis 'White' Sweet Rocket / Dame's Violet 'White'

Tall luminous white spikes that release a heady fragrance of violets and cloves after dark — Hesperis 'White' is the moon-garden hero that fills the tricky gap between spring tulips and summer roses, providing pure-white evening-scented flowers in shaded borders where few other plants will perform.

While the classic Sweet Rocket is violet-purple, the white form brings crisp, sophisticated elegance to the cottage evening garden. The tall 75–90cm branching stems carry the same loose clusters of four-petalled flowers, but in pure luminous white that genuinely glows in low evening light. This is the variety for moon gardens — plant a drift beneath a north-facing tree or alongside a white-painted garden seat, and the pale flowers will appear to glow at dusk just as their fragrance releases. The scent itself is identical to the purple form — powerful sweet violets-and-cloves designed to attract night-flying moths. Hardy biennial (H7). RHS Plants for Pollinators recognised. Orange Tip butterfly larval food plant — the white form is equally valuable to the butterfly as the purple. Bees, hoverflies and small pollinators visit during the day; moths visit at dusk.

A note on growing

Sow direct outdoors May–July, or in modules indoors at 15–18°C. Cover lightly with 3–5mm fine soil. Germination 14–21 days. Move plants to their final positions in October — partial shade or sun in moist humus-rich soil. As with all Sweet Rocket varieties, partial shade with consistent soil moisture is the most reliable position.

Self-seeding: white Hesperis self-seeds reliably, though offspring can revert to the purple form over time as Hesperis colours are genetically variable. To maintain pure-white colonies, rogue out any purple-flowered seedlings before they set seed — this maintains genetic purity over generations.

About Cabbage White caterpillars: same Brassica family connection as the purple form — check for caterpillars from July onwards.

Cutting tip: same as for the purple — cut when one-quarter of florets are open; the stem continues to open in the vase.

Where it shines

In moon gardens and white borders, where the luminous pure-white flowers glow in evening light just as the fragrance releases — combining visual and olfactory dusk magic. In shaded woodland borders. As an essential "moon garden bridge" — Hesperis 'White' fills the tricky gap between spring tulips ending and summer roses beginning, providing white flowers in May, June and July when many other moon-garden whites are absent. As cut flowers for white-themed romantic arrangements. In wildlife gardens for Orange Tip butterfly support.

Plant alongside

The classical moon-garden combination: pair 'White' Hesperis with Cosmos 'Purity', Ammi majus, Foxglove 'Alba White', and Cornflower 'Snowman' for a layered all-white cottage cutting garden that genuinely glows at dusk. For colour contrast, combine 'White' with 'Purple' for the timeless purple-and-white Sweet Rocket pairing. With Honesty (Lunaria, related Brassica) for the classic biennial woodland partnership.