This section is dedicated to the perennial species of Tropaeolum; go here for information on Annual Tropaeolum.
There is a tremendous range in size in Tropaeolum plants, climbers reach up to 3 metres (10 feet), whereas non-climbing varieties may only get as high as 10 cm (4 inches).
Members of the perennial Tropaeolum plant genus include Nasturtium, Flame Flower, and Climbing Nasturtium.
These plants tend to have green or greyey lobed leaves, and bloom in the summer.
Tropaeolum flowers are usually red, orange, or yellow, and are trumpet shaped.
Common Names: Flame flower.
Life Cycle: Half hardy perennial, hardy perennial.
Height: Perennials: 4 to 100 inches (100 to 250 cm).
Native: Central and South America.
Growing Region: Perennials: zones 6 to 9.
If growing Flame Flower and other perennial Tropaeolum plants outdoors, then sow the seeds a couple of weeks before you expect the last frost. The seeds should be lightly covered once sown.
The spacing is dependent upon the Tropaeolum species, smaller plants should be grown about 15 cm apart (6 inches), while larger ones can be spaced at about 30 cm (12 inches).
Perennial Nasturtium like to grow in a sunny area of the garden. This location should have a moist acidic soil.
If starting off indoors, then sow the seeds at about the same time as you would outdoors.
Nasturtium germination time is a little unreliable, and may take up to two years. It is best to germinate at about 12 to 15 degrees centigrade (54 to 59°F).
Perennial Tropaeolum plants, such as Climbing Nasturtium and Flame Flower, enjoy a moist soil, so keep well watered when it becomes dry.
Unfortunately, although perennial Tropaeolum plant species like to grow in the sun, their roots like it cool. Thus, it is important to keep the roots as protected from the sum as possible, so maintain a permanent mulch around the roots.