Lathyrus odoratus With a perfume as intense as its color, King Size Navy Blue sweet pea is one of the most intriguing varieties available. Big, gently ruffled blooms are a true, deep blue and cluster in groups of up to 5 flowers on each stem. Just right for beautifully scented fresh bouquets indoors. Strong vines climb 6–10 feet. Approximately 12 seeds per gram. Germination code: (4)