How to Grow White Sweet Alyssum
White Sweet Alyssum
Lobularia maritima
flowerSweet alyssum is a delicate, low-growing annual flower with tiny fragrant white blooms that form dense clusters. It is a prolific self-seeder that blooms continuously from spring through fall, making it ideal for borders, containers, and edging. The plant's sweet honey-like fragrance and abundance of flowers attract pollinators and beneficial insects.
When should you plant White Sweet Alyssum in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example White Sweet Alyssum timeline · Pittsburgh, PA (Zone 6b)
-
Plant White Sweet Alyssum
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
First White Sweet Alyssum blooms
Around May 22≈ 35 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact White Sweet Alyssum dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 2-11; best performance in zones 3-9 with moderate temperatures
Sign up free to see if White Sweet Alyssum grows in your zone — and get a personalized planting timeline.
Get my White Sweet Alyssum timeline →Growth Stages
Germination & Seedling
7-14 days to germination; 2-3 weeks to develop true leavesTiny seedlings emerge with small oval cotyledons. Plants are delicate and low-growing. First true leaves appear within 1-2 weeks.
Keep soil consistently moist but not soggy. Provide bright light indoors. Maintain cool temperatures (60-65°F). Thin seedlings to proper spacing once they have 2-3 true leaves.
Vegetative Growth
3-4 weeksPlant develops bushy, mounding habit with lance-shaped gray-green foliage. Becomes fuller and more compact. Height reaches 6-12 inches.
Pinch back growing tips to encourage bushiness. Maintain consistent moisture. Apply balanced fertilizer every 2-3 weeks or use slow-release fertilizer. Remove any early flowers to promote vegetative growth.
Flowering Onset
1-2 weeksFirst small white flower clusters appear at branch tips. Delicate, four-petaled flowers are honey-scented and arrange in small racemes.
Begin allowing flowering as plant reaches desired size. Remove spent flowers to encourage continuous blooming. Increase watering slightly if temperatures rise. Maintain light fertilizing schedule.
Peak Bloom
4-8 weeks; can extend to full season with proper carePlant is covered with abundant small white fragrant flowers in dense clusters. Blooms continuously in cool weather; may slow during peak summer heat.
Deadhead spent flowers regularly to maintain bloom production. Water consistently during hot spells. Reduce nitrogen fertilizer to avoid excessive foliage at expense of flowers. Watch for pests attracted to flowers.
Late Season & Seed Production
4-6 weeks until frost or season's endAs temperatures cool in fall, flowering intensity increases. If left undeadheaded, flowers produce tiny seed pods. Plant may self-seed for next season.
Allow some flowers to go to seed for self-seeding next year. Remove dead growth as frost approaches. In frost-free zones, plant may continue blooming through mild winters. Collect seeds in paper envelopes if desired.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Spray with strong water stream; use insecticidal soap or neem oil; encourage natural predators like ladybugs and lacewings
-
Use yellow sticky traps; spray with insecticidal soap; apply neem oil in evening
-
Use row covers on young plants; dust with diatomaceous earth; apply spinosad for severe infestations
-
Increase humidity with misting; spray with water; use miticide or neem oil if severe
-
Improve air circulation; avoid overhead watering; remove affected foliage; apply fungicide if necessary; ensure well-draining soil
Uses
Edible Flowers
CulinarySweet alyssum flowers are edible with a mild, sweet honey-like flavor. They make beautiful and delicate garnishes for salads, desserts, and beverages. [source]
Cut Flower & Arrangements
HouseholdThe delicate white flower clusters are perfect for small bouquets, hand-tied posies, and wedding arrangements. Their sweet fragrance adds an elegant touch to any room. [source]
Pollinator Support
WildlifeSweet alyssum is an excellent nectar source for bees, butterflies, hoverflies, and other pollinators. It attracts beneficial insects that help control garden pests. [source]
Ground Cover & Border Plant
HouseholdThe low-growing mounding habit makes sweet alyssum ideal for edging garden beds, lining pathways, and creating living borders. It softens hard edges and fills gaps between plants. [source]
Dried Flowers
CraftSweet alyssum flowers can be air-dried and preserved in their clusters for use in dried arrangements, pressed flowers, and craft projects. [source]
Harvest Tips
For seed collection: Allow flowers to mature on plant; when seed pods turn brown and dry, harvest entire flower stalks and place in paper bag to finish drying. Shake dried pods to collect seeds. Store in cool, dry place for up to 2 years. For cutting: Pick flower clusters in early morning when they are fresh and fragrant; place immediately in water; use in small posies or combined with other flowers.
Fun Facts
- 🌱 Sweet alyssum is a prolific self-seeder; you may find volunteer plants popping up throughout your garden in subsequent seasons, making it nearly 'free' to grow year after year.
- 🌱 The plant's scientific name 'maritima' refers to its native habitat along Mediterranean coastal cliffs, where it thrives in rocky, well-drained soil.
- 🌱 Despite its name, sweet alyssum is not a true alyssum (genus Alyssum); it was reclassified to Lobularia in the 1800s, but the common name 'sweet alyssum' has persisted.
Gardening Terms
New to gardening? Learn about terms used in this guide:
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized White Sweet Alyssum planting timeline
Tell us your zip code and we'll calculate exactly when to start White Sweet Alyssum seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my White Sweet Alyssum timeline →