Bupleurum rotundifolium aka Thoroughwax

Bupleurum rotundifolium, commonly known as hare's ear or hound's ear, is a flowering plant native to Morocco, Algeria, southern, central, and eastern Europe, Turkey, Iran, Turkmenistan, and Kyrgyzstan. This erect and branching annual can reach up to 30cm in height and features roundish leaves that clasp the reddish stem. At the end of each stem branch, clusters of tiny yellow flowers surrounded by leaf-like bracteoles form rings. While it was once a cornfield weed, it is now primarily found as a decorative garden annual. Hare's Ear is cultivated for its unique flowers and attractive foliage and is often used in flower arrangements. It blooms from summer to fall and thrives in average moist to dry well-drained soils, tolerating both full sun and partial shade. Although it has become an established weed in the eastern United States and South Africa, it has also been introduced in other regions.