Summary: Some may say that oxalis, or the shamrock plant, is an invasive weed, a sour-tasting groundcover or a cute houseplant. All three are correct. In warm climates, oxalis can be an attractive groundcover or a weed. In colder climates, yellow sorrel is an oxalis that grows as an understory plant in the forest. Then there's the tender houseplant versions. This is where oxalis becomes more interesting.
