Saffron Crocus prefer a cool to cold winter and warm to hot summer. Plant in March, 7-10 cm deep in a well drained, moderately fertilized soil in full sun. They can be left in the ground for several years. It is recommended to divide them every 2-3 years. The corms need time to adapt to local conditions and will generally multiply rapidly. Do not irrigate during dormancy. Please keep corms in a cool, dark, dry place until planting time.