'Stella De Oro' daylilies are dark yellow dazzlers that will add color and fragrance to the flower bed from May through August. Although each bloom on the compact, 24-inch plant will last for only one day, another flower will be waiting to take its place and the plant will rebloom later in the season if cut back. According to the Missouri Botanical Gardens, 'Stella de Oro' is among the most popular daylily in cultivation because of its "vigorous growth, profuse bloom and extremely long bloom period."
Plant 'Stella De Oro' daylilies any time of year that the temperatures are moderate. In most climates, spring or autumn are best. Select an area where the plants will be exposed to full sun or partial shade, and in well-drained soil that has been amended with 3 to 4 inches of manure or compost.
Soak the area deeply immediately after planting, and continue to water the daylilies deeply every week until healthy new growth is apparent. After that time, daylilies are drought-tolerant, and will require only an occasional drink during hot, dry weather.
Apply 2 to 3 inches of mulch around the plant every summer to retain moisture, control weeds and keep the soil cool. Use an organic mulch such as shredded bark, pine needles or dry grass clipping.
Fertilize the plant every spring, using a balanced slow-released fertilizer. Repeat in mid-summer. Always water immediately after fertilizing.
Pinch off spent blooms to keep the plant neat and to promote continued blooming as long as possible. Cut the stems close to ground level when the daylilies finish blooming. 'Stella de Oro' is considered a "reblooming" daylily and will produce more flowers before the end of the growing season if seed pods do not form on the stems of spent blooms.
Leave the foliage in place until the leaves die down and turn yellow in autumn.
Apply 3 to 4 inches of mulch around the plant in autumn. Use a mulch that will promote good air circulation around the plant, such as straw or leaves. After the first winter, dayliles require no winter protection.