The horned poppy could be grown just for its amazingly ornamental foliage: bluish, thick and leathery. The orange flowers are an extra bonus!
It is considered a biennial species, with large poppy like flowers in its second year. Quite at its limit in a zone 5 location, but possible in full sun and good drained location. All parts of this plant are toxic due to alkaloids content; medicinal in some countries, restricted in others. It can become weedy in warmer regions.
Germination: sow in the fall outdoors or early spring. Best germination happens at 5-15C/dark (‘mediterranean’ type).