Answer: Galanthus elwisii is commonly called snowdrop here in the States. It's a robust perennial with the ability to naturalize if the growing conditions are reasonable.
Galanthus grows from a bulb, but also produces seed. Bulbs multiply underground, so established stands tend to form clumps. You can divide the plants when they become overcrowded. Provide moist but well-drained fertile soil and dappled shade for best growth.
Depending upon how cold your winters are, Snowdrops will bloom in January-February, or March-April. You can divide after flowering if the plants are overcrowded. Otherwise, no care is needed and it's not necessary to cut back the foliage. The tops will die down when the weather gets cold but new flowers and foliage will appear next season.
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