Hemerocallis lilioasphodelus aka Yellow Daylily

Hemerocallis lilioasphodelus has the common name yellow daylily. It is a herbaceous perennial: its soft growth returns each year. It belongs to the Asphodelaceae family. Its home range includes the southeastern Alps and northeastern Albania. It also spans southwestern Siberia to southern Korea. It grows in parts of Europe and Asia with temperate climates. These have mild, rather than hot or cold, climates. It grows in rocky woods, wet meadows, and along rivers. It is not native to Britain or Ireland.

The plant spreads in clumps through rhizomes, or underground stems. Garden plants reach about 1.6–3.3 feet (0.5–1 metre) tall and wide. The RHS also gives a height of around 2.6 feet (0.8 metre). Thin leaves form a thick clump and die back with the seasons. The lemon-yellow blooms have a sweet scent and look like lilies. Each bloom spans about 3.1–3.5 inches (0.08–0.09 metre). Missouri Botanical Garden gives May as the bloom time. Plants For A Future also says it blooms in summer. That source says some blooms last three days.

Full sun gives the most blooms, though plants take some shade. More shade can mean fewer blooms. Rich, moist soil that drains well suits it best. It also grows in heavy clay and less rich soil. It can grow in acid, neutral, or alkaline soil. Water in dry spells helps it bloom in spring and early summer. Its water needs are moderate. The RHS gives it a hardiness rating of H6. Missouri Botanical Garden lists USDA zones 4–10. Plants reach full size in about two to five years.

Use clumps in flower beds, cottage gardens, and pots. They also suit large plantings in groups. The leaves add texture once the blooms fade. Its spread can cover the ground and keep weeds down. Butterflies visit the blooms. People have used dry leaves to make cord and footwear. The plant needs little care. Divide clumps in early spring or early autumn. Cut old flower stems and clear dead leaves as needed. Aphids, slugs, and snails may attack plants. Mites and thrips may attack them too. Leaf spot, rust, and bacterial rot can occur. Severe problems are rare.

Plants For A Future lists young leaves and shoots as food. It also lists buds, flowers, and cooked roots. Old leaves and shoots grow tough and stringy. The same source records past use of roots as medicine. These reports do not show safe ways to eat or treat with it. Reports say large amounts of leaves can cause hallucinations. The RHS warns that this plant is toxic to cats.