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Sweet Alyssum

Lobularia maritima

Sweet Alyssum is a delicate, low-growing annual wildflower featuring clusters of tiny, fragrant flowers in white, pink, or purple. Reaching just 3-9 inches tall, it matures in 50-60 days and spreads gracefully across borders and containers. This heirloom variety thrives in full sun to partial shade and tolerates poor, well-drained soil exceptionally well, making it ideal for challenging garden spots. While not typically eaten, Sweet Alyssum's defining characteristic is its intensely sweet, honey-like fragrance that attracts pollinators and fills gardens with subtle fragrance. Its vigorous self-seeding habit ensures prolific blooms throughout the season.

Harvest

50-60d

Days to harvest

📅

Sun

Full sun to partial shade

☀️

Zones

5–9

USDA hardiness

🗺️

Height

3-10 inches

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Planting Timeline

Zone:

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Transplant

Direct Sow

Transplant

Direct Sow

Showing dates for Sweet Alyssum in USDA Zone 7

All Zone 7 native-wildflower →

Zone Map

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Sweet Alyssum · Zones 5–9

What grows well in Zone 7? →

Growing Details

Difficulty

Very easy

Spacing6-8 inches

SoilWell-drained soil, tolerates poor conditions

pH6.0-7.5

WaterLow to moderate, drought tolerant

SeasonTender Perennial

FlavorSweet, honey-like fragrance but not commonly eaten

ColorWhite, pink, purple, or rose

Size1/8 inch individual flowers in dense clusters

Zone-by-Zone Planting Calendar

Zone	Indoor Start	Transplant	Direct Sow	Harvest
Zone 5	—	May – July	April – June	—
Zone 6	—	May – July	April – June	—
Zone 7	—	May – June	March – May	—
Zone 8	—	April – June	March – May	—
Zone 9	—	March – May	February – April	—

Succession Planting

Direct sow every 3 weeks starting March 1 in zone 7, continuing through early May. Germination takes 5-10 days in soil around 65-70°F. Alyssum slows down and goes partly dormant once daytime highs push past 85-90°F — sowings after mid-May tend to produce leggy, sparse-blooming plants that aren't worth the bed space. Start a second round in late August through September; fall-started alyssum frequently outperforms the spring planting in zones 7-9 because the cooler nights suit Lobularia maritima's preference for mild conditions.

Complete Growing Guide

Sweet Alyssum is fast and low growing, trouble free, and low cost, making it a popular choice for use as beneficial insect habitat in vegetable and fruit production. Because of its very manageable plant habit, Sweet Alyssum is a good choice for beneficial planting in greenhouses and containers, in addition to outdoor production. Sprawling plants with dense clusters of small flowers. Commonly known as sweet alyssum, but also known simply as alyssum. Tender perennial in Zones 9-11. Attracts and provides a food source for beneficial insects such as lacewings, parasitic wasps, syrphid flies, and tachinid flies. According to Johnny's Selected Seeds, Sweet Alyssum is 50 - 60 days to maturity, tender perennial, open pollinated. Notable features: Grows Well in Containers, Edible Flowers, Fragrant, Attracts Beneficial Insects.

Light: Full sun (6 or more hours of direct sunlight a day), Partial Shade (Direct sunlight only part of the day, 2-6 hours). Soil: Clay, Loam (Silt), Sand. Soil pH: Acid (<6.0), Alkaline (>8.0), Neutral (6.0-8.0). Drainage: Good Drainage, Moist, Occasionally Dry. Height: 0 ft. 3 in. - 0 ft. 10 in.. Spread: 0 ft. 6 in. - 1 ft. 0 in.. Spacing: 12 inches-3 feet. Growth rate: Medium. Maintenance: Medium. Propagation: Seed. Regions: Coastal, Mountains, Piedmont.

Harvesting

Sweet Alyssum reaches harvest at 50 - 60 days from sowing per Johnny's Selected Seeds.

Cream-colored oval seed pods with 1 yellowish seed each. The fruits are numerous, rather hairy, oval to rounded.

Color: Cream/Tan, Gold/Yellow. Type: Capsule.

Storage & Preservation

Sweet Alyssum is grown for flowers and beneficial insect habitat rather than as a food crop, so traditional storage is minimal. Fresh edible flowers last 1-2 days refrigerated in a shallow container lined with barely damp paper towels; keep at 35-40°F and avoid moisture that causes rot.

For preservation: **Drying** is most practical—hang small bunches in a warm, dry, dark space for 2-3 weeks, then store in airtight jars away from light. Dried flowers retain fragrance and can be used in herbal tea blends or crafts for 6+ months. **Candying** flowers for decoration: brush petals lightly with egg white, coat with superfine sugar, and dry on parchment paper for 24-48 hours; store in airtight containers with parchment between layers for up to 2 months. **Freezing** isn't practical for this delicate flower. For seed saving, dry mature seed pods completely, thresh, and store seeds in a cool, dry place (32-41°F) in paper envelopes for 2-3 years.

History & Origin

Sweet Alyssum is open-pollinated, meaning seed saved from healthy plants will produce true-to-type offspring. Listed in the Johnny's Selected Seeds catalog.

Origin: Southern Europe, west and central Mediterranean.

Advantages

+Fast-growing and low-maintenance, perfect for budget-conscious growers
+Attracts beneficial insects like lacewings and parasitic wasps effectively
+Compact sprawling habit suits containers, greenhouses, and outdoor production
+Dense flower clusters provide abundant nectar for beneficial insect populations
+Very easy to grow with minimal skill or experience required

Considerations

-Susceptible to aphids, flea beetles, and caterpillar infestations regularly
-Vulnerable to downy mildew, clubroot, and white rust diseases
-Not commonly eaten; primarily ornamental with limited culinary applications

Companion Plants

Sweet alyssum works best near tomatoes, brassicas like cabbage and broccoli, and carrots because its tiny clustered flowers — open at just 3-10 inches tall — are sized exactly right for hoverflies (Syrphidae) and parasitic wasps, both of which prey on or parasitize the aphids and caterpillars that hammer those crops. Marigolds and nasturtiums fit the same logic without competing for root space at alyssum's shallow depth. Black walnut is the one to avoid: juglone, the allelopathic compound it releases through roots and decomposing hulls, suppresses small-statured annuals like alyssum even at distances up to 50 feet. Dense-canopied trees cause a simpler problem — alyssum needs at least 4 hours of direct sun to bloom reliably, and a shaded plant that isn't flowering isn't attracting anything useful.

Plant Together

Tomatoes

Sweet alyssum attracts beneficial insects that control tomato pests like aphids and whiteflies

Cabbage

Acts as a living mulch and attracts parasitic wasps that control cabbage worms

Broccoli

Attracts hoverflies and lacewings that feed on aphids commonly found on brassicas

Carrots

Provides ground cover while attracting beneficial insects that help control carrot fly

Lettuce

Creates beneficial microclimate and attracts predatory insects for aphid control

Nasturtiums

Both attract beneficial pollinators and create complementary pest control strategies

Marigolds

Work together to create a diverse beneficial insect habitat while repelling various garden pests

Roses

Attracts beneficial insects that help control aphids and thrips on rose bushes

Keep Apart

Black Walnut

Produces juglone which is toxic to many plants and inhibits alyssum growth

Eucalyptus

Releases allelopathic compounds that suppress growth of nearby smaller plants

Dense Shade Trees

Sweet alyssum requires full sun and will become leggy and fail to flower in heavy shade

Pests & Disease Resistance

Resistance

Good disease resistance, may get downy mildew in humid conditions

Common Pests

Aphids, flea beetles, caterpillars

Diseases

Downy mildew, clubroot, white rust

Troubleshooting Sweet Alyssum

What you'll see, why it happens, and what to do about it.

White powdery or mealy coating on leaves and stems, often starting on older growth

Likely Causes

White rust (Albugo candida) — an oomycete pathogen common in cool, humid conditions
Poor airflow from overcrowded planting at less than 6-inch spacing

What to Do

1.Remove and trash (don't compost) affected leaves as soon as you spot them
2.Thin plants to at least 6-8 inches apart to get air moving through the canopy
3.Avoid overhead watering — water at the base in the morning so foliage dries fast

Grayish-purple fuzzy growth on the undersides of leaves, with yellowing on top — sometimes plants collapse fast

Likely Causes

Downy mildew (Peronospora parasitica) — thrives when nights are cool (50–65°F) and humidity is high
Dense plantings that trap moisture overnight

What to Do

1.Pull infected plants entirely if more than 30% of foliage is affected — this one spreads quickly
2.Space remaining plants out and mulch the soil surface to cut down on splash-up
3.Next season, keep Lobularia out of beds that recently held cabbage, broccoli, or other brassicas, which share this pathogen

Tiny round holes scattered across leaves, giving foliage a shot-hole look — seedlings hit hardest

Likely Causes

Flea beetles (Phyllotreta species) — they jump when disturbed and are worse in hot, dry spells
Transplanting or direct-sowing into a bed that previously held brassicas

What to Do

1.Cover young transplants with floating row cover (Agribon AG-19 or similar) for the first 2-3 weeks after planting
2.Keep the bed consistently moist — flea beetles prefer dry soil conditions
3.Once plants hit 4-5 inches tall and are putting on vigorous new growth, feeding pressure usually drops off on its own

Stunted, distorted growth on shoot tips; sticky residue on leaves; ants trailing up the stems

Likely Causes

Aphid colonies (commonly green peach aphid, Myzus persicae) clustering on new growth
Nearby ant colonies farming aphids for honeydew, which shields aphids from natural predators

What to Do

1.Knock aphids off with a firm spray of water — do this 3 days in a row to break the cycle
2.For heavy infestations, apply insecticidal soap (2 tsp per quart of water) directly to colonies, hitting the undersides of leaves
3.Avoid broad-spectrum sprays — alyssum draws parasitic wasps and ladybeetles that will do the cleanup work if you don't kill them first

Frequently Asked Questions

How long does sweet alyssum take to grow from seed to flowering?▼

Sweet Alyssum germinates in 7-14 days and reaches flowering maturity in 50-60 days from seed. Direct sown in spring soil, it typically blooms 6-8 weeks later. If started indoors 4-6 weeks before your last frost and transplanted, it will flower 3-4 weeks after transplanting. This rapid cycle makes it ideal for succession planting to maintain continuous beneficial insect habitat throughout the season.

Can you grow sweet alyssum in containers and pots?▼

Yes, sweet alyssum thrives in containers and is actually an excellent choice for pots, window boxes, and hanging baskets. Use well-drained potting soil, ensure drainage holes, and space 6-9 inches apart in containers. Water when the top inch of soil feels dry. Container plants may need slightly more frequent watering than in-ground plants. Containers allow you to position alyssum near vegetable plantings to attract beneficial insects exactly where pest pressure is highest.

Is sweet alyssum good for beginners?▼

Absolutely. Sweet Alyssum is one of the easiest plants to grow. It tolerates poor soil, requires minimal fertilizer, rarely suffers serious pest or disease problems, and grows quickly from seed. It germinates reliably without fussy light requirements (just barely cover seeds) and adapts to full sun or partial shade. Even neglected plants will produce flowers and attract beneficial insects, making it ideal for new gardeners building confidence.

What insects does sweet alyssum attract?▼

Sweet Alyssum is a nectar and pollen source for beneficial insects including lacewings, parasitic wasps, syrphid flies (hoverflies), tachinid flies, and small bees. These insects are natural predators of common garden pests like aphids, whiteflies, caterpillars, and spider mites. By planting sweet alyssum as a border or cover crop in vegetable gardens, you create a self-sustaining pest management system that reduces the need for interventions, making it invaluable for organic and regenerative growers.

When should I plant sweet alyssum in my garden?▼

Direct sow sweet alyssum in early spring as soon as soil is workable, or in late summer 6-8 weeks before your first fall frost for cool-season flowering. It tolerates light frosts and will bloom into winter in mild zones. For continuous flowering, sow seeds in succession every 3-4 weeks through mid-summer. Seeds need light to germinate, so barely press them into moist soil rather than burying them.

Can sweet alyssum flowers be eaten?▼

Yes, sweet alyssum flowers are edible with a mild, sweet, honey-like flavor. Use them as garnish on salads, desserts, or drinks for visual appeal and subtle sweetness. Pick flowers in the morning for best flavor and texture. While the flowers are safe and pleasant, they're not commonly used as a food crop—the plant's real garden value lies in attracting beneficial insects. If using edible flowers, ensure the plant was grown without pesticides.