Mesembryanthemum crystallinum, known as common ice plant, is a small perennial succulent in the ice plant family, Aizoaceae. M. crystallinum is native to Africa, south Europe, and the Sinai peninsula. It has small 1 to 3 inch long cylindrical leaves that are covered in bladder cells, giving this species its common name. Although it has small leaves, Mesembryanthemum crystallinum is able to creep 8 to 23 inches on the ground. The epidermis is glistening green, but turns more red with higher exposure to light. M. crystallinum blooms in spring to early summer with daisy-like flowers that are creamy yellow in color and 1 to 2 inches in diameter. This species is grown for its drought tolerance, colorful flowers, and ground covering growth habit. M. crystallinum grows best in full sun to partial shade sitting in well draining soil. Water adequately during summer and keep dry during winter as the species is prone to rot. Allow the soil to completely dry out in between waterings. USDA plant hardiness zones 9a through 11b.
Mesembryanthemum crystallinum seeds require consistent moisture and humidity to germinate, but the soil should not remain soaking wet. Cloning boxes, ziplock bags, and other containers that retain humidity are ideal to store sown pots. Use a well-draining sterilized soil mix. Seeds should be sown directly on top of the potting mixture and lightly covered with a thin layer of sand or potting mix, just enough to cover the seeds. Germinating pots should be kept indoors, out of extreme light and heat. Ideal germination temperatures range from 70°F to 80°F. Germination typically takes 1 to 3 weeks to occur. Even with optimal conditions, germination may be slow and sporadic.
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