This broadleaf weed begins in small, insignificant patches and rapidly progresses to takeover lawn areas. 

Oxalis Facts:

• Also referred to as "Yellow Woodsorrel"
• Begins with green leaves and then turns to reddish-purple
• Perennial weed
• Found mostly in late spring through late summer
• Low-growing, typically under 2" tall
• Three leaflets and often confused with clover and black medic
• 1/4" yellow flowers
• Thrives in moist, fertile soils but can grow almost anywhere
• Spreads by ejecting seeds up to 12 ft. away and also with underground rhizomes

Control Tips:

• Hand-pulling can be effective when plants are very young if the entire root system is removed
• Fairly difficult to control. Spray with selective herbicide several times throughout the year, after weeds emerge.
• Thick turfgrass areas will yield fewer weeds. Fertilize regularly, aerate and overseed each fall.
• Mowing at 3-4" will encourage a healthy lawn and reduce weed growth. 
• Irrigate lawn areas regularly so they receive 1-2" of water each week. 
• Proactive, comprehensive lawn care programs are recommended for best control.