Our natural crocus mixture contains many fragile-looking but robust-growing varieties. Flowers February-March. Height 10cm. Bulb size 5cm+. (Bulb sizes quoted in centimetres refer to the circumference of bulbs. All bulbs are sourced from cultivated stocks.) Botanical Crocus - These delightful botanical crocuses will withstand the coldest weather conditions, are ideal for naturalising, and will flower year after year with little maintenance. Crocuses are among the first heralds of spring. Their cups of vivid colours make such a welcome splash of colour that you’ll just want to keep planting more and more!