Flower · Growing guide
Sweet Alyssum
Lobularia maritima · Brassica family
Sweet Alyssum is a spreading flower grown for flower, beneficial insects, and edge planting. Use this guide to match its light, water, soil, space, seasonal care, and safety needs.
- Reliable light
- Full to part sun
- Water pattern
- Moderate
- Mature size
- 8 × 14 in
- Final spacing
- 8 in
- Season
- cool
01 · Light & site
Give it the light its growth depends on.
Full to part sun, with roughly 4 to 7 hours of useful light. Cool spring or fall conditions
02 · Water & soil
Keep roots supplied without trapping water.
Water the complete root zone, then recheck conditions before watering again.
- Soil
- Loose, organic garden soil
- Drainage
- Well drained
- pH
- Species-dependent, commonly mildly acidic to neutral
03 · Spacing & roots
Make room for the mature plant.
Space plants about 8 inches apart. Expect a mature plant around 8 inches tall by 14 inches wide.
Spreading roots or runners can extend beyond the visible crown.
04 · Start
Begin with the method that protects establishment.
Use a healthy transplant, division, slip, or crown suited to the species.
05 · Care
Support healthy growth through the season.
Usually self-supporting at the stated mature size. Add a discreet stake only if wind, bloom weight, or an exposed site makes it necessary.
- Upkeep
- Low
- Feeding
- Low
- Watch for
- Aphids, Downy mildew, Heat decline
06 · Flower or harvest
Flowering and seasonal interest
45 to 60 days. Flowering shifts with planting date, temperature, day length, and cultivar. Deadhead or cut blooms when that practice suits the plant and your goal.
07 · Safety
Know the cautions before you place or use it.
- Confirm cultivar, regional timing, and toxicity or food-use details with local extension guidance.
- Keep unknown plant parts away from children and pets.
08 · Sources
Check the evidence behind the guide.
Guide record: July 20, 2026. Region, cultivar, regulations, and current product labels can change the right decision.
Working checklist