PlantFiles: Nasturtium
Tropaeolum majus 'Tall Trailing Mix'

While sold a as "Tall Trailing Mix", it is a real climber! It climbed completely up over a three foot high fence, and then down the hill on the far side. Grows best in heavy shade. Bright directed sun will stunt the plants, and turn the leaves yellow. Ideal for planting among tall perennials, where the Nasturtium will grow up through the other plants and emerge late in the season when everything else is fading. Planted in hanging baskets it becomes root bound and grows to a size similar to other Nasturtiums.

This is a trailing variety that can get 8-10 feet in length. It is a rambler, it will not climb on its own. For vertical growing the trailing parts will have to be tied to a support.
Also, nasturtiums have become, for me, a mandatory companion plant with cucumbers to keep sucking insects away.