98 - 112 days. Knee High Mix sweet pea seeds grow into one of the most recognizable, popular, and nostalgic blooms ever! Sweet pea Knee High Mix blooms are a floral shop favorite and promise to complement your own small fresh-cut arrangements. Knee High Mix seeds are ideal for growing in limited spaces because the semi-dwarfed plant does not truly climb and vine out like other varieties of sweet pea. Knee High Mix sweet pea seeds are easy to grow and promise a vivid mix of lavender, scarlet, cream, pink, purple, red, and white blooms.