The thistle is a:

• A. Annual
• B. Biennial
• C. Perennial or biennial
• D. Poisonous

Answer: (C)

Thistles don’t fit a single one-year pattern. Their life cycle varies by species, with many behaving as biennials and others as perennials. Biennial thistles spend the first year as a rosette, bolt and seed in the second year, then die. Perennial thistles have a persistent root system or crowns that allow them to regrow year after year and keep producing seeds. So, describing a thistle as perennial or biennial captures the common range of how these plants live and persist. The other options don’t describe the typical life cycle: some thistles aren’t true annuals, and toxicity isn’t about how they live from year to year.