Daylilies are the perfect perennial. Each plant sends up many flower stems and each stem bears 12 or more buds. The blooms are lavish and continue for several weeks or more on each plant. Trouble free, maintance free, they tolerate most soils and conditions if they get at least 6 hours of sun a day. The Purple Cow is a fragrant, deep purple flower with a green throat and white mid rib. Mid season bloomer. Dormant variety.