Bulbs, Perennials, Tropicals > Dahlia > Dahlia 'Knockout'
Dahlia
'Knockout'
Knockout Dahlia
| Family |
| Asteraceae |
| Genus |
| Dahlia |
| Cultivar |
| 'Knockout' |
| Category |
| Bulbs, Perennials, Tropicals |
| USDA Hardiness Zone |
| 9 |
| Canadian Hardiness Zone |
| 9a |
| RHS Hardiness Zone |
| H3 |
| Temperature (°C) |
| - 5 - 1 |
| Temperature (°F) |
| 23 - 34 |
| Height |
| 0.5 m - 1 m |
| Spread |
| 0.5 m - 1 m |
Photographs
Description and Growing Information
Flowering Period
| General Description |
| Dahlia 'Knockout' is a delicate perennial with bright yellow flower with orange centres. |
| Landscape |
| Container plantings and as a single specimen. |
| Cultivation |
| Fertile, humus-rich, well-drained soil, enriched with organic matter as well as fertilizer. Full sun requirement. |
| Shape |
| Clump-forming. |
| Growth |
| Fast |
| Pests |
| Aphids, leaf miners, glasshouse red spider mite and slugs are common pests. Earwigs sometimes damage blooms. Powdery mildews can be damaging in dry conditions. In wet weather grey moulds and other fungal rots can be a problem. |
| Habitat |
| Horticultural origin. |
| Leaf Description |
| The leaves are pinnate with toothed ends. Leaves range in colour from dark mahogany to purple-black. |
| Flower Description |
| Single to semi-double flowerhead averaging around 8 - 10 cm in diameter. Flowers are bright yellow with orange centres. |
| Notable Specimens |
| Lanhydrock Gardens, Cornwall, England. |
| Propagation |
| Softwood cuttings taken in spring from shoots will propagate. |
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