This grower is sure of this plant identification.
Orange hawkweed, Hawkweed
Hieracium aurantiacum (Orange hawkweed). This perennial will produce basal rosettes with elliptical to lance-shaped dark blue-green leaves. The flowers are produced in clusters of yellow-orange small blooms in the late spring.
You will need to grow in poor quality well-drained soil with a position in full sun.
Can be found on grass and waste land.