St. Barnaby's Thistle, Yellow star-thistle

Centaurea solstitialis

Physical Characteristics

Centaurea solstitialis is a ANNUAL/BIENNIAL growing to 0.6 m (2ft). See above for USDA hardiness. It is hardy to UK zone 6. It is in flower from July to September, and the seeds ripen from September to October. The species is hermaphrodite (has both male and female organs) and is pollinated by Bees, flies, Lepidoptera (Moths & Butterflies). The plant is self-fertile. It is noted for attracting wildlife. Suitable for: light (sandy), medium (loamy) and heavy (clay) soils, prefers well-drained soil and can grow in nutritionally poor soil. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils and can grow in very alkaline soils. It cannot grow in the shade. It prefers dry or moist soil and can tolerate drought.

Distribution

S. Europe to W. Asia. Occasionally established in S. and E. England[17].

Habitats

Cultivated Beds;

Edible Uses

Edible Parts: Leaves Edible Uses: The plant is eaten as a vegetable[100]. The part used is not specified.

Medicinal Uses

Lithontripic The powdered seed is used as a remedy for stone[4]. The powdered root is said to be a cure for fistula and gravel[4].

Known Hazards

There is a report that the plant causes brain lesions and a nervous syndrome called 'chewing disease' in horses[274].