What's your question? Ask

If you are referring to leucojum plants, these grow from bulbs. The bulbs need nourishment from this year's foliage to ready them for next spring's show. For best bulb health and future flowers leave the foliage in place until it yellows. When that happens, feel free to cut of pull it off.

Yellowing is most often associated with a lack of nitrogen. These should be fertilized at least once per year. Dolomitic lime helps to buffer the soil pH to a more appropriate level if it is out of balance. Both of these together will help them to come back to their original color.