Oxalis deppei 'Iron Cross', or Good Luck Shamrock, is a perennial Oxalis that grows from a scaly tuber. The soft green leaves have a purple variegation in the center of the leaves resembling a cross. The plants grow in clumps and will teach up to 12 inches (30 cm) tall. Unlike most Oxalis species this one prefers a sunny location. They are hardy in the landscape in USDA zones 8-10.
Blooming: Oxalis deppei plants will bloom from June through October, producing dark pinkish flowers. It is very showy when in bloom.
Culture: Oxalis deppei needs full sun to light shade, preferring a rich, moist soil mix. In the greenhouse, we use a soil mix consisting of 2 parts peat moss to 1 part loam to 1 part sand or perlite. The plants are kept moist at all times but not overly wet. We fertilize them monthly during the growing season with a balanced fertilizer diluted to ˝ the strength recommended on the label. During the winter months, we move the plants to the cool room where the temperatures are kept at 48°F (9°C). During this period, the plants remain evergreen and water should be restricted somewhat, but plants should never be allowed to dry completely. Re-potting and dividing plants is done every other year in the greenhouse.
Propagation: Oxalis deppei 'Iron Cross' is propagated in spring by division of large clumps.
Oxalis deppei 'Iron Cross' was featured as Plant of the Week June 9-15, 2006.
Guide to Past Plants-of-the-Week:
Cal's Plant of the Week was provided as a service by the University of Oklahoma Department of Microbiology & Plant Biology and specifically Cal Lemke, who used to be OU's botany greenhouse grower and an avid gardener at home as well. If the above links don't work, then try the overview site. You may also like to look at the thumbnail index. ©1998-2012 All rights reserved.