Annuals > Helianthus > Helianthus annuus > Helianthus annuus 'Sonja'
Helianthus annuus
'Sonja'
Sonja Sunflower
| Family |
| Asteraceae |
| Genus |
| Helianthus |
| Species |
| annuus |
| Cultivar |
| 'Sonja' |
| Category |
| Annuals |
| USDA Hardiness Zone |
| 2 - 11 |
| Canadian Hardiness Zone |
| 0a - 8a |
| RHS Hardiness Zone |
| H1c - H7 |
| Temperature (°C) |
| -46 - 10 |
| Temperature (°F) |
| -50 - 50 |
| Height |
| Up to 1 m |
| Spread |
| Up to 0.5 m |
Photographs
Description and Growing Information
Flowering Period
| General Description |
| Helianthus annuus 'Sonja' is a hardy annual sunflower with yellow-orange ray blooms. |
| Landscape |
| Makes a good specimen plant or en masse. Grow against a fence, shed, house or veranda for support and as a backdrop to other plants. |
| Cultivation |
| Grow in full sun to part shade. Staking may be required for taller plants and/or heavy flower heads. |
| Pests |
| Possible problems include: caterpillars, beetles, leaf fungal spots, rust and powdery mildew. |
| Habitat |
| Horticultural origin. |
| Leaf Description |
| Alternate, medium-green. |
| Flower Description |
| Solitary, terminal, short ray petals are golden orange, centres are dark brown. Blooming from midsummer to early autumn. |
| Propagation |
| By seed sown in February to May, germination takes 5 - 21 days. |
top