Climate matters. This page is a practical baseline. Confirm cultivar, local frost/heat conditions, mature size and regional restrictions before planting.
Grapefruit — Growing reference
| Scientific name | Citrus paradisi |
|---|---|
| First harvest or flowering (days) | 1460–2555 |
| Measured from | Transplant |
| Plant spacing (cm) | 457.2–762 |
| Mature height (cm) | 365.8–762 |
| Mature spread (cm) | 365.8–609.6 |
| USDA hardiness zones | 9–11 |
| Light | Full sun |
| Water | Moderate |
| Sowing method | Transplant |
Growing directions
Grapefruit is self-fertile and produces best in the warmest citrus climates — the prolonged heat of south Texas and southern California delivers better sugar development than coastal or inland zones 9. Trees are large and vigorous; allow 20–25 feet between them and avoid overcrowding with other trees. Ruby Red and Flame are popular pink-fleshed varieties with good cold tolerance for zone 9. Fruit takes 12–18 months from bloom to full ripeness; taste-test from late autumn onward — the peel may remain slightly greenish even when the juice is sweet.
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