Bred and introduced in 2005 by Dr. Tomas Tamberg 'Drei Quellen' contains genes from all three Siberian Iris species. I. Sibirica, I. Sanguinea & I. typhifolia.
For us 'Drei Quellen' flowers the earliest of all of our Siberian Iris even in a very cold spring and we find it very easy to grow and a good flower producer.
Flower spikes 90-120 cm.
Flowers for us from May to June but may be earlier in a mild spring.