Big thanks to the horticultural team at Thompson & Morgan for their helpful advice following Jesse Yuen’s post the other day (here) about ongoing problems with Bermuda Buttercups (Oxalis pes-caprae*). It’s looks like a chemical weedkiller (which Jesse is not going to use) can’t rid a garden of them.

“Bermuda Buttercups are a plant that you may have to learn to garden with rather than against. Pulling up plants always leaves tiny bulbils behind that grow into new plants, it can also result in the spread of bulbils to new areas. These bulbils act as storage organs which are very persistent, lying dormant beneath cardboard or mulch for months, possibly years, so that as soon as the ground is exposed to light they re-emerge. Constant hoeing will help to deplete the bulbils, but again – it will take years for this to have any effect.”

“Even If you decide to use chemical weedkillers, timing of application is critical and you may have to do it more than once. You need to catch the plants just at the point before or on flowering. This is when the bulbils are exhausted of food whilst young bulbils are too small to survive. Not all plants will be at exactly the same stage so repeated applications for several years are required.”

Thanks again to all at Thompson & Morgan for imparting their knowledge about the plant that is giving our good dub gardening friend Jesse a headache at the moment.

*The specific epithet pes-caprae means ‘goat’s-foot’, possibly in reference to the shape of the leaf. (wikipedia)