Climate matters. This page is a practical baseline. Confirm cultivar, local frost/heat conditions, mature size and regional restrictions before planting.
Sweet Alyssum — Growing reference
| Scientific name | Lobularia maritima |
|---|---|
| Seed germination (days) | 5–10 |
| Soil temperature for germination (°C) | 15.6–21.1 |
| First harvest or flowering (days) | 40–60 |
| Measured from | Seed |
| Plant spacing (cm) | 15.2–25.4 |
| Mature height (cm) | 7.6–20.3 |
| Mature spread (cm) | 20.3–30.5 |
| USDA hardiness zones | 3–11 |
| Light | Full sun |
| Water | Moderate |
| Sowing method | Direct sow |
Growing directions
Scatter seed on the soil surface and press gently — light aids germination; just barely cover if needed to prevent the seed from blowing away. Sweet alyssum may slow or stop blooming in peak summer heat; shear plants back by half and they will rebound strongly when temperatures cool in early fall. The honey-scented flowers attract beneficial insects throughout the season.
Source and local conditions
Typical planning ranges from OpenPlantDB (CC0). Cultivar, climate, season and growing method can change these values. Confirm the seed label and local guidance before planting.
Source & verification
OpenPlantDB · CC0