Ensure the Ornithogalum dubium is in soil that drains well. The bulb can rot if it stays wet in its winter dormant season. A raised bed, rock garden or sandy soil work best when the plant grows outdoors permanently. Otherwise, lift the bulbs at the end of each season and replant them in the spring, or grow the plant in a pot, which can be stored out of rainy weather over the dormant season. Store lifted bulbs in a mesh bag in a dry, airy environment.
Add compost to the soil at planting time in the spring. Bulbs should be buried 3 inches deep and 3 to 6 inches apart for best performance.
Water the plant so it is moist, but not soggy during the growing season. Feel the soil with your fingers to ensure it is not too wet before watering.
Remove spent flowers as they die back, pulling the spike from the plant once all flowers have faded.
Apply a water-soluble all-purpose ornamental plant fertilizer around the base of the plants when it has completed flowering.
Prune off foliage to the ground only after it has yellowed. Until that point, it still is taking in energy for next season's growth.
Dig up the bulbs and separate offsets to replant in new locations every few years or when blooming or the general health of the plant decreases.
Don't be alarmed if the strappy foliage at the base of the plant is floppy, the 4-inch basal foliage naturally lies on the ground