Kelly Larson says: 'We sell hardy Oxalis species that can be grown as garden plants in our Wisconsin climate, but houseplants such as Oxalis triangularis should be tucked up indoors until summer ...

Oxalis, a clover look-alike, is one of the worst weeds at this time of the year. For physical control, you must remove the carrot-like root or bulbs attached to the leaves. Dig them out with a trowel.