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Lobularia maritima

Sweet Alyssum

A low flowering edge for vegetable beds, with small blooms visited by pollinators and beneficial insects.

Grows in Zones 4–12Growing guide
Sweet Alyssum growing or ready to harvestPhoto: Forest and Kim Starr · CC BY 2.0

Set your expectations

When will it bloom?

Usually 6–9 weeks from seed to first flowers
Cold-weather noteUse local frost dates and protect young plants from hard freezes.
Start withSeeds or nursery transplants
Life cycleUsually grown as a cool-season annual
DifficultyEasy to moderate

Your seasonal plan

When to grow sweet alyssum in Zone 6.

The flower row shows when established plants may bloom. Leave some flowers for insects and adjust planting to your local frost dates. These are useful planning windows, not exact weather guarantees.

Typical planting windowMarch–April and August–September
Typical bloom windowJune–September

Growing essentials

What sweet alyssum need to thrive.

Use the practical details below with your Zone 6 timeline. Current weather and the variety you choose can shift timing.

LightFull sun to part sun; afternoon shade in hot climates
SoilAverage, well-drained soil
Planting depthPress seeds onto the surface; barely cover because light helps germination.
Spacing6–12 inches apart
WaterKeep seedlings evenly moist; water established plants when the surface dries.
Best conditionsMild weather; intense summer heat can reduce flowering.

How to plant

Plant it well.

Sow in a fine seedbed several weeks before the last spring frost, or start indoors 5–6 weeks earlier. Transplant gently near the last frost. In mild climates, sow again in fall.

Indoors or containers

Start seedlings under lights. A sunny outdoor container gives better flowering than a windowsill.

Keep it growing

Care through the season.

  • Trim lightly when flowering slows and water during dry spells. Leave room around vegetable stems.
What to avoid

Expecting uninterrupted bloom through intense summer heat; flowering often returns as temperatures cool.

Ready to harvest

Know the cue, not just the date.

  • Enjoy flowers in place for insects, or snip a few stems when blooms are fresh.

How we know

Sources and growing guidance.

The growing essentials and seasonal planning windows are original summaries informed by university Extension references; always adjust for current local weather and variety instructions.

Sweet Alyssum: plant profile and cultivationNorth Carolina State ExtensionFlowers in the vegetable gardenUniversity of Illinois Extension

Extension sources checked · November 2026. Seasonal windows are planning estimates.