It is intereting how much small differences can vary results. I planted the same nasturtiums from the same seed packet as last year in the same spot. They weren't as crowded as last year and they grew like wildfire.
Just two plants grew up to 18 feet vines that snaked into every hole. They even went through a crevice between the wood frame and stone, grew under the steps and came out through an alcove. Another set of them also grew well in a new bed. Another variety--salmon colored were overwhelmed by this type and did little. A variegated version grew into nice compact bushes.
Compact Variegated version:
Unfortunately I had to take them down today cause I finally had time to do some garden work. The Nasturtiums (which also grew five feet vertically) intertwined with tomatoes and grape vines. I needed to get them all untangled. They all are still growing and flowering a week before Halloween in Zone 6b. Last year my Nasturtiums go overrun with aphids and I just yanked them.
DiGiTAL ViNYL (no email) Zone 6b/7, Westchester Co, NY,