P. lutea
Minimum temperature: -15°C [5°F]
Flower diameter: 1-1,5cm [0,3-0,6"]
Minimum temperature: -15°C [5°F]
Flower diameter: 1-1,5cm [0,3-0,6"]
P. lutea can be planted out in Germany and so the winter.
A cover in winter to protect against too much water is recommended but not necessarily, as otherwise the rhizomes may rot.