It's not a crocus at all!
Common Name: autumn crocus, meadow saffron, naked ladies
Botanical Name: Colchicum autumnale
Form: low, spreading
Plant Type: perennial corm
Mature Size: 6 to 10 inches
Origin: Great Britain, Europe
Hardiness Zone: 4 to 8
Foliage: 5-8 dark green, strap-like leaves up to 10" long, appears in spring then dies back during the summer.
Flowers: showy lavender-pink to lilac-pink cup shaped flowers that open into stars, appear in August, Sept without any foliage
Fruit: small brown seeds form in capsules
Exposure: full sun, part shade
Soil: rich, well drained soils
Uses: woodlands, mix borders, fall colour, naturalizing
Propagation: divide corms, sow seeds
Pruning: cut back foliage once it turns yellow
Problems: as their abundant foliage yellows in summer, it becomes unsightly, they also multiply quickly
Comments: Each corm grows an abundance of foliage in spring that yellow and dies back in summer. In August and September, multiple flowers emerge from each leafless corm, hence their common name ‘naked ladies’. Avoid locations where they take center stage during the summer as their yellowing foliage is abundant. Grow in containers so you can place them where you want when they are in flower. Reduce water when the foliage starts to yellow. Although their common name implies they are a crocus, however, they are not related.