Outsidepride Nasturtium Mahogany Plant Flower Seeds - 200 Seeds This double gleam mahogany nasturtium seed grows as an annual vining, flowering plant in USDA zones 3 - 10 Nasturtiums, also known as Tropaeolum Majus, blooms profusely all summer long with beautiful mahogany flowers. This flowering plant will produce 2 to 3 inch wide unique mahogany flowers. These plants have semi-double deep mahogany red blooms and are deer resistant. These climbing, vining plants will reach a mature height of 60 inches and spread approximately 12 inches wide. Sow 1 to 2 seeds per plant or 3 to 4 pounds per 1,000 square feet for a dense display of these trailing heirloom flowers.