The Easiest Roses You Can Grow: Knock Out Perhaps the best-known landscape rose, 'Knock Out' bears masses of cherry-red blooms over dark red foliage. It's disease resistant and blooms all season long. Size: To 3 feet tall Zones:
Red roses have become the icon of love and romance, but there are so many other varieties that are equally meaningful. For example, purple roses signify enchantment and love at first sight, while orange roses exemplify passion.