White Sweetclover (Melilotus albus) Seeds

White Sweetclover (Melilotus albus) is a vigorous biennial legume that first forms a rosette, then produces tall, branched stems covered with long clusters of small white flowers during its second year. Green, three-part foliage and an airy silhouette add movement and height to managed flowering strips. From June through September, the blossoms produce abundant nectar and develop a sweet, vanilla-like fragrance when drying. This Eurasian species is not native to Quebec and can reseed heavily. It should therefore be grown only in a controlled area, well away from sensitive natural habitats, waterways, native prairies, and unmanaged open land.

White sweetclover prefers full sun and well-drained, neutral to alkaline soil, including poor, gravelly, sandy, or lightly clay-based sites. Its long taproot improves access to moisture and provides good drought tolerance after establishment. The seeds have a hard coat, so light scarification generally improves germination before spring or fall sowing. Water moderately until plants are rooted, then mainly during prolonged drought. As a legume, it can fix atmospheric nitrogen through associations with compatible soil bacteria and therefore needs little fertilizer. Avoid acidic soil, dense shade, and locations that remain waterlogged, as these conditions reduce establishment, vigour, and flowering.

White sweetclover is best reserved for temporary pollinator strips, carefully managed cover crops, and agricultural plots where seed production can be monitored. Its flowers strongly attract honey bees, native bees, butterflies, hoverflies, and other beneficial insects. Deep roots and plant residues may help improve some disturbed soils, but the species should not be used to restore natural habitat. Cut every flowering stem before the pods mature to reduce spread, because seeds can remain viable in the soil for many years. Pay particular attention to nearby ditches, slopes, grasslands, shorelines, and transportation corridors where escaped plants could establish and displace other vegetation.