Despite the name, summer snowflake bulbs (Leucojum aestivum) bloom in mid to late spring in most areas, just a couple of weeks after the spring snowflakes (Leucojum vernum). Both bulbs have grass-like foliage and dainty, fragrant drooping bells. They look almost exactly like snowdrops (Galanthus nivalis), which blooms a couple of weeks before spring snowflakes. You can tell the difference between the two flowers by the fact that snowflakes have a green dot at the tip of each of its six petals, while snowdrops have dots on only three of its petals. Nothing could be easier than snowflake plant care.
Summer snowflakes are the larger of the two plants, growing 1 1/2 to 3 feet tall. The foliage of spring snowflake bulbs grows about 10 inches tall and the flowers bloom on 12-inch stalks. Unlike some spring bulbs, the snowflake’s foliage lasts a long time after the flowers fade. Growing snowflake Leucojum at the back of a low-growing perennial border creates an interesting backdrop for late spring and early summer-blooming flowers.
https://www.gardeningknowhow.com/ornamental/bulbs/snowflakes/growing-snowflake-bulbs.htm