Oxalis (False Shamrock) are undemanding plants that grow in rounded clumps of clover-like leaves and 5-petaled flowers.  The leaves open up in the day and fold up at night.  Vigorous and spreading, they are easily propagated by separating the rhizomes in late summer.  The bulbs are peculiar, growing together almost like a pine cone in a long bulbous line.  When it's time to plant, you can gently break apart the bulb cone into individual bulbs.  In warmer climates they will grow happily in a sunny location with well-drained soil.  In colder areas, dig in the fall and store until spring.  They are easily grown in containers which will last for years.