Mixed Ixia The Ixia Yellow Emperor, 'Ixia acaulis', a spring planted corm, produces beautiful yellow flowers among sword-like leaves. The long flower stems are adorned with the star-shaped flowers. The Ixia are used in borders, beds, containers, perennial gardens, and is an excellent cut flower. Ixia are also commonly called the African Lily. They love the sun and heat. Ixia cut flowers will last 2 weeks or more. Place them in well drained, rich, fertile soil.