Seeds from Tropaeolum azureum or Blue Nasturtium. Native to Chile, this rare vine has fine, bright green foliage covered with true azure blue petals surrounding a white throat. Blue Nasturtium can be grown as an annual in warmer climates with blooms appearing in spring, and continuing on thru summer. With a height of 7 feet, grow this vine on a trellis in a sheltered area in full sun to part shade. Zones 9 to 11.