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Sizes can range from tiny micro dahlias with flowers less than 50 mm to giants that are over 250 mm in diameter. The groupings listed here are from the New Zealand Society: [72] Giant-flowered cultivars have blooms with a diameter over 250 mm. Large-flowered cultivars have blooms with a diameter of 200–250 mm.
The bulbs need some exposure to cold temperatures for 12 to 14 weeks in order to bloom. [1] Flower bulbs are generally planted in the fall in colder climates. The bulbs go dormant in the winter but they continue to absorb water and nutrients from the soil and they develop roots. [2] Most bulbs produce perennial flowers.
There are 42 accepted species of flowering plants in the genus Dahlia, according to The Plant List. [1] The sectional classification of Dahlia sensu Sørensen (1969) [ 2 ] as updated by Saar et al. (2003) [ 3 ] and Hansen (2004) [ 4 ] and (2008) [ 5 ] is as follows (excluding infraspecific taxa);
After some Dahlia species were brought from Mexico to Europe in the 16th century, D. imperialis was first described in 1863 by Benedikt Roezl (1823–1885), the great Czech orchid collector and traveller who, ten years later (in 1872–73), embarked on a plant odyssey through the Americas.
By 1893, Arthur started selling his seed packets for home gardeners. Yates began to sell other gardening items apart from seeds, and the range soon included fertiliser, sprays, pots, potting mix and tools. In 1895, the Yates Garden Guide was published, a basic gardening guide. The guide is still published today, after 110 years. [1]
Many dahlia pinnata types can grow from seeds but more often they are cultivated by division of the tuberous roots or by stem cuttings. Providing the flower with some kind of plant food (mulch, growing media, nutrient food, etc.) can really make the dahlia healthier and more likely to survive. [9]
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