Actually called wood sorrel, this clover looking weed is always looking for a place to take root. This pesky weed pulls out easily, but if you let it go to seed the pods explode and spread the seed far & wide. It is VERY difficult to eradicate.
Here are a couple of options:Hand Weeding – Hand weeding is very effective. It pulls easily and will not re-sprout from roots left behind. Removing the plants before they go to seed reduces the population.
Chemical Control – Pre-emergence herbicides are the most useful, they prevent seed germination – the way oxalis spreads. Check with a reputable local nursery/garden center for advice on the best herbicide for your area. And many herbicides will kill the grass as well, so be sure to apply according to the package directions.
Many post emergent herbicides are not effective. Timing and the use of a spreader/sticker are important. Yellow wood sorrel has a very waxy leaf and stem, water beads and rolls off. A spreader/sticker will break down the waxy layer, allowing the herbicide to penetrate into the leaf and then do its job.
Spot spraying young plants works well.
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