How to Grow Alyssum: Carpet of Snow
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Alyssum: Carpet of Snow
Lobularia maritima 'Carpet of Snow'
flowerCarpet of Snow is a compact, mat-forming annual alyssum cultivar prized for its prolific white flowers and sweet fragrance. It grows low to the ground, creating dense carpets of delicate blooms throughout the growing season. This heat and drought-tolerant variety is excellent for borders, edging, containers, and rock gardens.
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Example Alyssum: Carpet of Snow timeline · Pittsburgh, PA (Zone 6b)
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Plant Alyssum: Carpet of Snow
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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First Alyssum: Carpet of Snow blooms
Around May 22≈ 35 days after planting
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Growing Conditions
Soil
Growing Zones
Find your zone →Performs best in zones 3-10; grown as annual in most climates, tender perennial in zones 9-11
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Get my Alyssum: Carpet of Snow timeline →Growth Stages
Germination
7-14 daysTiny seedlings emerge with first true leaves appearing within 7-10 days
Keep soil surface moist but not soggy. Provide bright light and warm temperatures (65-75°F). Thin seedlings to proper spacing to prevent damping off.
Vegetative
2-3 weeksLow-growing foliage develops into dense mounds 4-6 inches tall with small, narrow green leaves
Water regularly but allow soil to dry slightly between waterings. Begin pinching back at 3-4 weeks to encourage bushier growth. Apply balanced fertilizer every 2-3 weeks.
Budding & Flowering
2-4 weeks to first bloom, then continuous for weeksDense clusters of tiny white buds form along stems, opening into fragrant flowers in tight racemes
Deadhead spent flower clusters to encourage continuous blooming. Reduce nitrogen fertilizer to promote more flowers over foliage. Water consistently but avoid wetting foliage.
Peak Bloom
4-12 weeks depending on heat and carePlant becomes a solid carpet of white flowers, highly fragrant, covering the foliage almost completely
Deadhead regularly (every 2-3 weeks) to prevent seed set and extend blooming. Fertilize lightly with low-nitrogen formula. Pinch back leggy stems to maintain compact shape.
Decline & Seed Set
Continues until frost or heat stress ends growthFlowering slows in intense heat (above 90°F); plant may get woody or leggy if not deadheaded; sets small seed pods if allowed
In cool climates, continue flowering until frost. In hot regions, provide afternoon shade or mulch roots to cool soil. Allow some flowers to set seed if you want self-sown seedlings next year.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with strong water stream, use insecticidal soap, or release ladybugs. Neem oil effective but use in evening to avoid foliage damage.
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Apply row covers when young, dust with diatomaceous earth, or use neem oil. Usually minor problem on alyssum.
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Increase humidity by misting, use insecticidal soap, or spray with neem oil. More problematic in hot, dry conditions.
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Use yellow sticky traps, spray with insecticidal soap, or apply neem oil. Usually not a serious issue.
Uses
Edible Flowers
CulinaryAlyssum flowers are mildly sweet and peppery, making attractive garnishes for desserts, salads, and beverages. They add delicate flavor and visual appeal to special dishes. [source]
Fragrant Cut Flowers
HouseholdThe sweet honey-like fragrance makes Carpet of Snow excellent for cutting and bringing indoors. Use in small posies, wedding arrangements, or as filler in larger bouquets. [source]
Pollinator Support
WildlifeSmall but abundant flowers attract honeybees, native bees, and beneficial insects. Alyssum serves as important early-season nectar and pollen source. [source]
Ground Cover & Border Plant
HouseholdThe dense, spreading growth habit makes it perfect for edging beds, softening hardscape edges, and filling gaps in gardens. Creates visual flow and fills small spaces efficiently. [source]
Dried Flowers
CraftFlowers dry well while maintaining color and fragrance. Use in potpourri, dried arrangements, or craft projects. Hang small bunches upside down in dark, airy location. [source]
Harvest Tips
Alyssum is ornamental but seeds can be collected for next year. Allow some flower clusters to fully dry on the plant, then collect seed pods. Seeds are viable for 3-4 years. For cut flowers, harvest in early morning when fragrance is strongest; flowers last 5-7 days in water. Self-seeds prolifically if allowed to set seed.
Fun Facts
- 🌱 Carpet of Snow is named for its ability to completely blanket garden beds and containers with pure white flowers; it can produce thousands of blooms on a single plant.
- 🌱 The sweet, honey-like fragrance of alyssum comes from volatile organic compounds and becomes more pronounced in warm, sunny weather and early morning hours.
- 🌱 This variety often self-seeds in mild climates, establishing itself in cracks, crevices, and garden edges without replanting, making it a nearly permanent fixture in some gardens.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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