Don’t confuse this weed with clover – it’s MUCH smaller and has tiny yellow flowers. A relative of woodsorrel, oxalis is a woody herbaceous plant – unlike clover, which is a legume. Oxalis has a nasty habit: it has exploding seed heads! As each tiny yellow flower dies and dries up, a seed bud forms, and a powerful spring mechanism grows inside the bud. When the trap is sprung (usually by a passing lawn mower or a gust of wind), multiple seeds are thrown out up to 18″ away from the plant. The seeds germinate, and make new oxalis plants.

Control: Oxalis is easily killed using Ortho Weed-B-Gon or Bayer Advanced All-in-One Lawn Weed Killer, but you will need to spray several times to get the newly sprouted plants, as the seeds are unaffected by the weed killer. These chemicals will not damage the lawn grasses when used properly. As with all broad-leaved weeds, spray in between mowing and do not water for several days.

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About the Author:

Max Todd, owner of Fairway Lawn Service has been in the lawn business since he was seventeen years old. He worked for a lawn service for six years before starting Fairway Lawn Service in 1977. Now, thousands of San Francisco Bay Area homeowners rely on Fairway Lawn Service to aerate their lawns on a regular basis. Its customers also benefit by Max's expertise and free advice. Max loves lawns, and knows everything about them. Call him. You'll see!