P. Rockii was so called because at the base of petals there are obvious black, purple, and brown-red spots. Its main features are:
1. Tall plant, can reach 2-3 m high, crown width 3-4 m.
2. Big and bright flower, the diameter can reach 18-25 cm.
3. Strong fragrance; the smell of one open flower can dominate that of 10 other open flowers from another Peony.
4. Resistance to drought and frost; tolerance of salt and base. Can bear temperatures as low as -43