Crocus Yellow Mammoth is a superb yellow variety for bright color in early spring. We recommend planting them with hellebore and galanthus in wooded areas for natural look and color. Crocus is extremely cold hardy and one of the earliest to bloom in spring. Once established, they are care-free, multiply over the years and flower every spring. Crocus will naturalize readily on the edge of the property, in wooded areas or in the garden border. Bulb size: 9 cm.