HYACINTH BEAN Vine -20 seeds Long, vine is also very ornamental, with lilac-colored blossoms and purple stems. Handpicked by me Fall 2024!! 😊 75 Days Full Sun Sprouts in 5-8 Days Ideal Temperature: 70-80 Degrees F Plant Spacing: 6-10" Frost Hardy: No Be sure to provide sturdy support like a trellis, as the vines can reach up to 15-20 feet in a single growing season​​. Moonshadow hyacinth bean is sensitive to frost and should be planted after the last frost date in your area. In regions with short growing seasons, you can start seeds indoors 2-3 weeks before the last expected frost and transplant them outdoors once the danger of frost has passed. The optimal soil temperature for planting is at least 60 F, ideally 70-80 F​.