Article in English: When they first push up shoots, add a little well-balanced fertilizer. Lilies are fairly hardy, and don't require a lot of fertilizer. In fact, too much nitrogen can result in weak stems, and in hot, wet climates can also result in bulb rot.  For optimal results, choose a high-potassium liquid fertilizer. Apply this every two weeks from early spring until 6 weeks after the plant flowers.  Fertilize when first sprouting, and again about a month later. Lilies generally don't need a lot of water, so only water if required.  Asiatic lilies, Trumpets, and Orienpets flourish in hot, dry climates, as long as they have enough water up to flowering time. Orientals need watering during the summer, as they do not blossom until August. Adding mulch in the summer helps keep the bulbs cool, and so lowers the need for additional watering. During winter months, cover the lily bed with straw or evergreen boughs to protect the bulbs from freezing. During the flowering season, trim the spent blooms, keeping at least 2/3s of the stem intact to keep your strong and healthy for years to come.

Summary in Chinese:
给百合花施肥。 只在需要的时候给百合花浇水。 注意防冻。 注意修剪百合花。