Royal Sweet Pea (Lathyrus Odoratus Royal Navy Blue) - This dark colored Sweet Pea navy blue will be a deep purple or navy blue depending on soil nutrients. It is one of the darkest blue Sweet Peas in existence. Up to five large, wavy bloom clusters on long, slender stems. Royal Sweet Pea vines are early flowering and can last right up until frost in fall if the summer is cool. Sweet Peas are perfect cut flowers, so you can spice up the living room with a nice bouquet, and the flowers are pleasantly scented and are carried on long stems for easy arranging. Grow Blue Sweet Peas in full sun, but in areas of very hot summer weather, provide some afternoon shade for the best performance. Position them away from winds and rotate locations from year to year to prevent Sweet Pea pests. In cold climates plant the flower seed in early spring, as soon as the soil can be worked. In warm climates, plant in October through January for spring bloom. Season: Annual USDA Zones: 3 - 9 Height: 72 - 84 inches Bloom Season: Early summer to late summer Bloom Color: Navy blue Growth Rate: Fast Environment: Full sun