Climate matters. This page is a practical baseline. Confirm cultivar, local frost/heat conditions, mature size and regional restrictions before planting.
Hyssop — Growing reference
| Scientific name | Hyssopus officinalis |
|---|---|
| Seed germination (days) | 7–14 |
| Soil temperature for germination (°C) | 15.6–21.1 |
| First harvest or flowering (days) | 75–100 |
| Measured from | Transplant |
| Plant spacing (cm) | 30.5–45.7 |
| Mature height (cm) | 45.7–61 |
| Mature spread (cm) | 30.5–45.7 |
| USDA hardiness zones | 3–9 |
| Light | Full sun |
| Water | Low |
| Sowing method | indoor-start |
Growing directions
Sow seeds 1/8 in deep indoors in warm starting mix; germination is fast and reliable at 65–70°F. Plant in lean, well-drained, slightly alkaline soil — hyssop is drought-tolerant once established and thrives in conditions similar to lavender. Prune plants back by about one-third after flowering to keep them from becoming woody and to promote a compact, bushy habit. Harvest leafy stems and flowers in the morning just as the blossoms begin to open, drying them for use in expectorant teas, culinary herb blends, and potpourri.
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