Climate matters. This page is a practical baseline. Confirm cultivar, local frost/heat conditions, mature size and regional restrictions before planting.
Morning Glory — Growing reference
| Scientific name | Ipomoea purpurea |
|---|---|
| Seed germination (days) | 5–10 |
| Soil temperature for germination (°C) | 18.3–23.9 |
| First harvest or flowering (days) | 65–90 |
| Measured from | Seed |
| Plant spacing (cm) | 15.2–30.5 |
| Mature height (cm) | 182.9–304.8 |
| Mature spread (cm) | 30.5–61 |
| USDA hardiness zones | 3–11 |
| Light | Full sun |
| Water | Moderate |
| Sowing method | Direct sow |
Growing directions
Nick the hard seed coat with a file or soak in warm water for 8–12 hours before sowing 1/2 in deep to speed germination. Morning glories need a fence, trellis, or other support and are best sown directly at the base of their support. Avoid over-fertilizing, which promotes leaves at the expense of flowers. Blooms open in the morning and close by afternoon on each individual day.
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