miscanthus reed
萱 refers to a specific type of tall grass: the miscanthus reed, often used for thatching or as ornamental grass.
萱 combines the grass radical 艹 with 宣, which likely contributes the sound. The character specifically denotes the miscanthus reed.
The grass radical 艹 sits above 宣, like tall miscanthus reeds growing over a roof-like structure, ready for thatching.
For ケン, picture Ken (a person named Ken) cutting tall miscanthus reeds with a scythe: Ken -> ケン, and the reeds fall like the grass under 艹.
daylily (any flower of the family Hemerocallis); day lily
Themeda triandra var. japonica (variety of kangaroo grass)
orange daylily (Hemerocallis fulva var. littorea); tawny daylily
mother
harvest mouse (Mus minutus)
orange daylily (Hemerocallis fulva var. kwanso); tawny daylily
orange daylily (Hemerocallis fulva var. disticha); tawny daylily
Cymbopogon tortilis var. goeringii (variety of grass closely related to lemongrass)
Themeda triandra var. japonica (variety of kangaroo grass)