Horticulture/Oxalis stricta

Yellow Woodsorrel (Oxalis stricta) is an annual woodland and meadow plant native to North America, where it is among the most common garden weeds.

Description
From late spring through autumn, it produces yellow flowers which are quickly followed by explosively opening seed capsules.

Uses
The flowers, seed pods and leaves are edible with a taste similar to lemons, green grapes and sunshine all rolled into one.