Hemerocallis 'Joan Senior' (Daylily 'Joan Senior') is a classic, near-white daylily valued for its big, softly ruffled blooms and clean, arching foliage. You can use it to brighten borders, foundation beds, and mixed perennial plantings, especially where you want a light flower color that still reads well from a distance.
At maturity, expect clumps about 20-25 inches tall in bloom with a spread around 20-24 inches. Each flower lasts a day, but established plants carry many buds and open fresh blooms in succession. This cultivar is commonly described as a rebloomer, so you may see a second flush later in the season when conditions are favorable.
Give it full sun for the most flowers, though it also performs well in part shade, particularly in hotter summer climates. Plant in average, well-drained garden soil; daylilies adapt to many soils but bloom best with consistent moisture during active growth and flowering. Mulch helps moderate soil temperature and reduces the need for frequent watering.
For tidier plants and extended display, remove spent blooms and trim finished scapes back to the foliage. Divide clumps every few years if flowering declines or if you want to increase your planting. With straightforward care, 'Joan Senior' settles in quickly and provides dependable summer color year after year.