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Snow trillium, or Trillium grandiflorum, is a perennial with white or pink flowers that blooms in the spring. It grows up to 18 inches high and 12 inches wide and does well as a border plant, shade plant or wildflower. The name trillium refers to the plant's structure, which is made up of three sepals, three petals and three leaves. In the fall, each flower produces a berry-like fruit.
Choose a planting bed that is in the full to partial shade. The plant does best in open shade.
Make sure the soil is moist and rich. If it's sandy or clay-like, work in compost and a good gardening soil until the quality improves.
Consider using snow trillium as a ground cover, because it spreads on creeping underground stems with dense clumps of foliage and flowers that last for up to a month.
Check the soil pH to determine if the soil is alkaline or acidic enough, as snow trillium requires soil with a neutral pH. You can purchase a test kit from hardware or garden stores.
Increase the pH by 1.0 point to make it more alkaline by adding 4 oz. of hydrated lime per square yard in sandy soil; if you have loamy soil, add 8 oz. Mix in 1.2 oz. of ground rock sulfur per square yard of soil to reduce the soil pH by 1.0 point, making it more acidic.
Plant snow trillium in the fall. Dig holes that are 2 to 4 inches deep. Place the eyes facing upward, and space the plants 5 to 8 inches apart. Cover with soil and water.
Avoid cutting the leaves at the end of the season because they give the plant nourishment for the following year.