PlantsFlowers
Sea Holly


Eryngium planum
Zone 6a garden plant. Hardy through a Chicago winter unless the note says to pot it.
Blue thistles that like a mean, sunny spot
EasyFlowers
- Light
- Full sun
- Moisture
- Dry
- Mature size
- 2–3 ft
- Spacing
- 1 ft
- Bloom or harvest
- Flowers Jun–Aug
- How it spreads
- Taproot
- What to buy
- A small pot. Don’t break the root.
- When to plant
- May
In the design
Dry sun. Wet clay in winter is what kills it, not the cold. Not rattlesnake master, which is the native one to use if the brief is a prairie.




