Alyssum Royal Carpet

Alyssum 'Royal Carpet' Sweet Alyssum 'Royal Carpet'

A low, dense, honey-scented carpet of deep violet-purple that holds its rich colour through the entire British summer without fading — and provides one of the finest and most unexpected colour combinations the cottage garden path or border edge can offer.

The purple counterpart to 'Carpet of Snow', and arguably the more striking of the two for cottage garden use. 'Royal Carpet' grows to just 10–15cm but produces masses of tiny, sweetly fragrant violet-purple flowers from late spring to autumn, forming a dense, ground-covering mat that's particularly effective as a foil for warm-coloured neighbours. The honey scent is identical to its white sister — surprisingly powerful for such a small flower — and the bees love it just as much. An All-America Selections winner with proven garden performance, hardy enough to handle a UK summer, and one of the few low-growing annuals that genuinely earns its place at the front of every border.

A note on growing

Sow indoors from March to April at 15–20°C, or direct outdoors from late April once the soil has warmed. Surface-sow or barely cover — alyssum needs light to germinate. Germination takes one to two weeks. Plant out after the last frost in full sun and well-drained soil. Like 'Carpet of Snow', this variety prefers lean ground; rich soil encourages foliage at the expense of flowers. Trim back lightly after the first flush for a second wave of bloom in late summer. Self-seeds gently.

Where it shines

As an edging plant where the violet contrasts beautifully with paler neighbours, in containers where it spills attractively over the edges, and as a "scented frame" for hot-coloured plantings of Calendula, Nasturtium or Mesembryanthemum where the purple makes the warm tones sing. Particularly effective at the front of a mixed cottage border, where its low habit doesn't compete with taller plants but adds a band of saturated colour at ground level. Bees, hoverflies and short-tongued pollinators adore the open flowers.

Plant alongside

Pair with 'Carpet of Snow' for a classic two-tone alyssum carpet, or use 'Royal Carpet' as a foil for warm tones — Calendula 'Oopsy Daisy', Nasturtium 'Tom Thumb', or the neon brights of Mesembryanthemum 'Harlequin'. For a cool romantic combination, plant beneath shrub roses or alongside Brachycome.