Although peonies and herbaceous peonies have similar flower shapes and are both important ornamental flowers, they differ significantly in botanical classification and morphological characteristics. The following are the main criteria for differentiation:
I. Flowering Period Differences: Peonies typically bloom earlier than herbaceous peonies. Peonies generally begin blooming in March, with peak bloom from April to May; herbaceous peonies naturally bloom from May to June, but the actual blooming time may be as early as mid-to-late April. The specific flowering period varies depending on the climate conditions of the cultivation area.
II. Stem Morphology: Peonies are deciduous shrubs with woody stems. The above-ground parts of the plant are perennial woody structures, and the branches remain even after the leaves fall in winter.
Herbaceous peonies are perennial herbaceous plants with herbaceous stems. The above-ground parts wither each winter, and new shoots sprout from underground tubers the following spring.
III. Leaf Characteristics: Peony leaves are relatively broad and thick, with 3 to 5 lobes at the tip. The upper surface of the leaf is green with a yellowish tinge, and the underside is often covered with a white powder.
Peony leaves are relatively narrow and thin, usually undivided at the tip, dark green and glossy on both sides, and densely distributed.
IV. Flower Differences: Peony flowers are mostly solitary at the branch tips, with a large diameter, typically around 20 cm; flower shapes are diverse, including single-petaled, lotus-like, chrysanthemum-like, rose-like, crown-like, and hydrangea-like forms; flower colors are also varied.
Peony flowers are usually clustered, with a relatively smaller diameter, about 15 cm; flower shapes are relatively simple, and there is less varietal variation.
V. Fruits and Seeds: Peony fruits are follicles, often pentagonal, containing 7 to 13 brown seeds, turning from orange-yellow to dark brown when ripe.
Peony fruits are aggregate follicles, usually with 2 to 8 free pods, varying in shape; each pod contains 1 to 5 seeds, which are black or dark brown, and nearly round or oblong in shape.
These characteristics can serve as the main basis for distinguishing between peonies and herbaceous peonies. In actual observation, it is recommended to make a comprehensive judgment by combining multiple characteristics. Especially when the flowering period overlaps or the plant is young, the texture of the stem (woody or herbaceous) is the most reliable identification standard.
