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Dahlia imperialis
Dahlia imperialis, the tree dahlia or imperial dahlia, is a large flowering plant of the family Asteraceae, native to the Americas from Mexico to Colombia.
This species is fast-growing, the growth spurt being linked to shorter daylight hours; the tree dahlia usually comes into flower in autumn, before the risk of frost. Propagation is by seed or by stem cuttings, around 30 cm (12 in) long and having at least two nodes, laid horizontally about 5–10 cm under the soil; top-dressing with pea gravel, decomposed granite, or grit is optional but helpful for moisture retention, erosion control and additional drainage.
It is native to Mexico, Belize, Guatemala, Honduras, El Salvador, Nicaragua, Costa Rica, Panama and south into Colombia and Ecuador. It is a plant of the uplands, mainly found in the foothills of subtropical or tropical mountains (above the humidity of the lower forests), at elevations around 1,500–1,700 m (4,900–5,600 ft).
Dahlia campanulata · Red dahlia · Bedding Dahlia · Pinnate dahlia · Dahlia tamaulipana · Dahlia tenuicaulis · Dahlias
Text excerpted from the Wikipedia article Dahlia imperialis by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
