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Star Thistle
Centaurea solstitialis
In the United States:
Invasive
· also called Yellow starthistle, Golden starthistle
Listed as invasive. Check local regulations — several jurisdictions restrict planting.
Honeybees forage on yellow starthistle for its high nectar yields during the summer bloom period, contributing significantly to honey production in arid, open landscapes. The flowers also offer pollen, supporting brood rearing, though it is nutritionally moderate. This annual plant features spiny flower heads that demand careful handling, and its deep taproot enables drought tolerance in full-sun, disturbed sites.
| Nectar | high |
|---|---|
| Pollen | medium |
| Bloom (US) | June–September |
| Type | Perennial |
| Sun | full |