Crocus tommasinianus aka Woodland Crocus

Crocus tommasinianus is a small perennial in the iris family. Its names include snow crocus, woodland crocus, and Tommy crocus. It comes from southeastern Europe and grows in temperate climates. Its native range spans southern Hungary, southwestern Croatia, and northwestern Bulgaria. It is not native to Britain or Ireland. Gardeners grow it for flowers that arrive before many spring plants.

This plant grows from a corm and forms upright clumps. It reaches about 0.3–0.5 feet (0.1–0.15 metres) tall. RHS gives a spread of 0.3 feet (0.1 metres). Each plant has three to five narrow, green leaves. These grow from the base and have smooth edges. The leaves emerge as the flowers begin to open. They later die back, leaving the plant dormant. In lawns, wait for yellow leaves before you mow.

Flowers appear from late winter into early spring, often in March. Local records give a wider season from January through April. Plants can flower while snow still lies on the ground. Each bloom has six petals and a long tube. Colours range from pale lavender to red-purple and deep purple. The throat is white, and the outside may look paler. Flowers open in the morning and close in the evening. They stay shut on cloudy days. Their low height suits planting beside paths and near shrubs.

Full sun gives the best results, though plants tolerate partial shade. Use soil that drains well, with grit or sand. Poor to moderately fertile soil suits this species. Avoid clay that holds water around the corms. Plant corms 3–4 inches deep, with similar space between them. Water needs are moderate, and care needs are low. No pruning is needed. RHS rates its hardiness H6. American sources list zones 3–8, while Chicago lists 5–9. Grow it in rock gardens, containers, borders, or open woodland. It can also naturalize in lawns and form broad groups.

Serious insect and disease problems are not usual. Mice, squirrels, other rodents, and birds may still cause damage. Reports suggest squirrels trouble this species less than other crocuses. It tolerates deer browsing and chemicals released by black walnut. Stored corms can rot. Raise new plants from ripe seed or separate dormant cormlets. RHS warns that its ornamental bulbs are unsafe to eat. This warning applies to both people and pets. Wear gloves and protective gear when handling them.