Alyssum – Sweet Royal Carpet

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Alyssum ‘Sweet Royal Carpet’ (Lobularia maritima) is a compact, low-growing annual flower known for its dense clusters of fragrant violet-purple flowers. Plants generally grow about 3–6 inches tall and develop a spreading, trailing habit, forming a colorful carpet that works well for borders, edging, rock gardens, containers, pathways, and mass plantings.

Sweet Royal Carpet grows best in full sun to partial shade and performs well in well-drained soil with moderate moisture. It is adaptable to a range of garden soils and can tolerate some dry conditions once established. In hot climates, flowering may slow or temporarily stop during periods of intense summer heat and resume when temperatures moderate.

This variety is particularly useful as a low-growing ground cover, border plant, or filler around taller flowers and other landscape plants. Its compact, spreading habit makes it well suited to areas where a low carpet of color is desired.

Sweet Alyssum produces fragrant flowers that provide nectar and pollen for bees, butterflies, hoverflies, and other flower-visiting insects. It can also attract beneficial insects, making it useful in pollinator and beneficial-insect plantings.

Sweet Alyssum is native to the western and central Mediterranean region and is not native to the United States. It has been introduced into numerous states, including Oregon, Washington, California, and many areas of the eastern and southern United States.

Sweet Alyssum is generally grown as an annual, although it can persist as a short-lived perennial in mild climates. Plants may reseed where growing conditions are favorable.

Growing Conditions

Sweet Alyssum performs best in:

• Full sun to partial shade
• Well-drained soil
• Moderate and consistent moisture
• Loamy, sandy, or other well-drained garden soils
• Cool to moderate growing conditions

Plants can tolerate some dry conditions once established, but adequate moisture generally supports better growth and flowering.

Avoid locations with consistently saturated or poorly drained soil.

Planting

Sweet Alyssum is easy to establish from seed and can be direct seeded outdoors or started indoors.

For direct seeding, prepare a firm, weed-free seed bed and broadcast the seed evenly over the soil surface. Press the seed firmly into the soil to provide good seed-to-soil contact. Do not bury the seed deeply, as Sweet Alyssum requires light for good germination.

For indoor starting, sow approximately 4–6 weeks before the expected last spring frost and transplant outdoors once conditions are suitable.

Pacific Northwest Planting

In Oregon and much of the Pacific Northwest, spring planting is generally the most reliable approach for establishing Sweet Alyssum as an annual.

Sow outdoors once soil conditions are suitable. Keep the seed bed evenly moist during germination and early establishment.

Fall planting can also be used in areas with mild winters, but spring planting is generally more dependable in colder areas.

Warm-Climate Planting

In warmer regions, fall planting can be advantageous because plants can establish and flower during cooler portions of the growing season.

Sweet Alyssum generally performs best when protected from prolonged periods of extreme summer heat.

Germination & Establishment

Sweet Alyssum generally germinates in approximately 15–20 days under favorable conditions.

Because the seed is very small, sow it shallowly and maintain consistent moisture during germination. Good seed-to-soil contact is important for uniform establishment.

Plants can begin flowering approximately 5–6 weeks after establishment, depending on planting date, temperature, and growing conditions.

Blooming

‘Sweet Royal Carpet’ produces masses of rich violet-purple flowers with a sweet fragrance.

Flowering can continue from spring through fall when temperatures and moisture remain favorable. In hot summer conditions, flowering may decrease or temporarily stop before resuming when temperatures moderate.

Trimming plants after heavy flowering can encourage fresh growth and additional blooms.

Choosing the Right Site

Choose a location with full sun to partial shade and well-drained soil.

Sweet Royal Carpet is particularly well suited to:

• Flower borders
• Garden edging
• Pathways
• Rock gardens
• Containers
• Hanging baskets
• Mass plantings
• Low-growing ground cover
• Pollinator gardens
• Beneficial-insect plantings

Pollinator & Beneficial Insect Value

Sweet Alyssum produces fragrant flowers that provide nectar and pollen for a variety of beneficial insects.

The flowers attract bees, butterflies, hoverflies, and other flower-visiting insects. Sweet Alyssum is also valued as an insectary plant because it can attract beneficial insects that contribute to natural pest management.

Important Planting Consideration

Sweet Alyssum is an introduced species in the United States. Although it is widely cultivated as an ornamental and pollinator plant, it can self-seed readily under favorable conditions and has been reported as potentially invasive in certain areas, including portions of California.

If planting Sweet Alyssum near natural areas or in restoration settings, check with your state Department of Agriculture, local extension service, or other regional authority for current recommendations.

Larger Quantities

For quantities larger than those currently listed for sale, please contact us for availability and pricing.

Seeding Rates

The broadcast rate for seeding is 4–5 pounds per acre.

The seed drill rate for seeding in rows is 2 pounds per acre.