What are Dahlias?
Dahlia are bushy, tuberous, herbaceous perennial plants native to Mexico and Central America. Its garden cousins include the sunflower, daisy, chrysanthemum and zinnia.
How many species are there?
There are 42 species of dahlia, with hybrids commonly grown as garden plants. Flower forms are variable, with one head per stem, these can be as small as 5cm diameter or up to 30cm (dinner plate).
What is the size range of Dahlias?
The stems are leafy, ranging in height from as low as 30cm to an enormous 1.8-2.4m! The majority of species do not produce scented flowers though, Like most plants that do not attract pollinating insects through scent, they are brightly coloured, displaying most hues, with the exception of blue.
More information can be seen Gardening Australia, plant profile Dahlias.