- Standard (medium)
Problem... a cultivar that will grow to 50cm (1'8") in Northern Europe will grow up to 90cm (2'6") tall in tropical countries. The perfect growing conditions in the tropics and sub tropics can add 30 cm (1ft) to the smaller varieties and up to 100 cm (3'3") with the largest giant varieties.
It is obvious that collectors in different latitudes need to provide their own definitions of what the terms above mean in their own areas. While there may be exceptions, it is likely that individual cultivars will stay in the same height categories at each latitude definition.
So, for us in the northern European growing range, I would state that our definitions are:
- Miniature - up to 50 cm ((19")
- Small - up to 100 cm (3'3")
- Standard (medium) - 100 cm (3'3") to 200 cm (6'6")
- Tall - 2 metres (6'6") to 3 metres (9'9")
- Giant - over 2 metres (9'9")
Canna 'Skyhawk', a giant Canna, which in Northern Europe grows up to 3.5 metres (12'), but which has reports of 4.5 metres (15') at latitudes closer to the equator.
The next question is whether these height categories should be translated into Cultivar groups. More to follow on that subject.