Hemerocallis fulva 'Kwanso Flore Plena' is a fully double-flowered, triploid cultivar of the common orange ditch lily, selected in Japan and long cultivated across East Asia before reaching Western gardens. Its large, ruffled, deep orange blooms with reddish streaking are sterile and last one day each, replaced in rapid succession over several weeks in early to midsummer. Because it sets no viable seed, spread occurs entirely by rhizome.
The plant is exceptionally tolerant of poor soils, slopes, roadside conditions, and neglect. Its dense rhizome mat suppresses weeds effectively and controls erosion on banks and embankments. That same vigor can become a management challenge in mixed borders; divide clumps every three to four years to check spread. In drier climates a 2–3 inch mulch layer conserves moisture and helps contain rhizome creep into adjacent planting areas. Cold-hardiness extends reliably to zone 3a with no additional protection required.
The flower buds and young spring shoots of H. fulva have a documented history of use in East Asian cooking — dried buds are the golden needles used in Chinese braised dishes and hot-and-sour soups. In traditional Chinese medicine, dried buds have been employed for anxiety, insomnia, and as a hemostatic agent. H. fulva carries nephrotoxic risk for cats and should be sited accordingly.
Rust
Orange to brown raised pustules on the undersides of leaves, with yellow spotting on the upper surface. Heavy infections cause leaves to yellow and drop.
Remove and destroy infected leaves. Avoid overhead watering and improve air circulation. Apply a sulfur or copper-based fungicide if it spreads. Clear plant debris in fall.
Crown Rot
Lower leaves yellow and wilt; the base of the rosette turns brown and soft, sometimes with white fungal threads at the soil line. Plants collapse in wet conditions.
Remove and destroy affected plants. Improve drainage and avoid overhead watering. Do not mulch directly against the crown. Space plants for airflow and avoid replanting in the same wet spot.
Daylily Leaf Streak
Yellow streaks running lengthwise along leaves from tip toward base, progressing to tan or brown necrotic tissue; heavily infected leaves die back prematurely, leaving the clump looking scorched by midsummer.
Remove and destroy infected foliage as soon as symptoms appear. Avoid overhead irrigation. Apply a broad-spectrum fungicide labeled for Aureobasidium at first sign of infection and repeat per label intervals during wet periods. Cut all foliage to ground level in fall and dispose of debris away from the garden to reduce inoculum for the following season.