Dahlia 'Knockout' (Knockout Dahlia)
Botanical Information
| Family | Asteraceae |
| Genus | Dahlia |
| Cultivar | 'Knockout' |
| Category | Bulbs, Perennials, Tropicals |
Details
| USDA Hardiness Zone | 9 |
| USDA Hardiness Ref. | |
| Canadian Hardiness Zone | 9a |
| Canada Hardiness Ref. | |
| RHS Hardiness Zone | H3 |
| RHS Hardiness Ref. | |
| Temperature (°C) | - 5 - 1 |
| Temperature (°F) | 23 - 34 |
| Height | 0.5 m - 1 m |
| Spread | 0.5 m - 1 m |
| Growth | Fast |
| Flowering Period | June, July, August, September |
Description and Growing Information
| General Description | Dahlia 'Knockout' is a delicate perennial with bright yellow flower with orange centres. |
| Shape | Clump-forming. |
| Landscape | Container plantings and as a single specimen. |
| Propagation | Softwood cuttings taken in spring from shoots will propagate. |
| Cultivation | Fertile, humus-rich, well-drained soil, enriched with organic matter as well as fertilizer. Full sun requirement. |
| 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. |
| Notable Specimens | Lanhydrock Gardens, Cornwall, England. |
| 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. |
Photographs
Dahlia 'Knockout', form. Lanhydrock Garden, Cornwall, England. 16/10/2019.
Dahlia 'Knockout', leaf. Lanhydrock Garden, Cornwall, England. 16/10/2019.
Dahlia 'Knockout', flower. Lanhydrock Garden, Cornwall, England. 16/10/2019.