Gardenia — Growing reference
| Scientific name | Gardenia jasminoides |
|---|---|
| Seed germination (days) | 30–60 |
| Soil temperature for germination (°C) | 18.3–23.9 |
| First harvest or flowering (days) | 365–730 |
| Measured from | Transplant |
| Plant spacing (cm) | 91.4–152.4 |
| Mature height (cm) | 91.4–182.9 |
| Mature spread (cm) | 91.4–152.4 |
| USDA hardiness zones | 7–11 |
| Light | Partial sun |
| Water | Moderate |
| Sowing method | Cutting |
Growing directions
Plant in moist, acidic (pH 5.0–6.0), well-drained soil with afternoon shade in zones 8–10 to prevent leaf scorch; gardenia is prized for its intensely fragrant, waxy white flowers that bloom in late spring to midsummer and makes one of the most effective landscape shrubs in the Deep South when sited correctly. Maintain consistent soil moisture but never allow roots to sit in standing water — drought stress triggers bud drop. Fertilize monthly from spring through summer with an acid-type fertilizer; yellowing leaves between the veins (interveinal chlorosis) signal iron or manganese deficiency and respond to applications of chelated iron. Root semi-hardwood stem cuttings in late summer for propagation.
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