The UC Master Gardeners of Yolo County addressed common concerns about garden weeds in their monthly column published on Apr. 10. The column provides practical advice for local gardeners struggling with unwanted plants as the spring season brings new growth.
Weed management is a frequent challenge for gardeners, and the methods used can vary depending on the type and location of weeds. The column notes that while chemical controls exist, non-chemical options such as mulching, hand-pulling, hoeing, and mowing are often preferable and should be prioritized, especially around vegetable gardens.
Physical barriers like mulch or weed mats can help suppress weed growth if applied before seeds develop. Mechanical methods such as cutting or mowing are most effective when done prior to seed production to prevent further spread. In areas densely populated with weeds, manual removal may be necessary between plants, while larger spaces might benefit from ground covers like cardboard or black plastic.
Certain species present unique challenges. The Bermuda buttercup (Oxalis pes-caprae), once introduced as an ornamental plant but now considered invasive in California, spreads through underground bulblets that are difficult to remove entirely. “When weeding Bermuda buttercup, beware that for every white or brown bulblet uprooted with the plant, there are probably a half dozen or more bulblets remaining in the soil,” the column states. Another persistent species mentioned is Oxalis corniculata (creeping wood sorrel). For these tough weeds, some gardeners opt for herbicides to maintain control.
Not all weeds are entirely unwelcome; dandelions (Taraxacum officinale) provide early nectar for pollinators and edible leaves for salads. However, their spread can be limited by removing seed heads before dispersal.
University of California Agriculture and Natural Resources secures funding through public contributions to support its programs according to the official website. The organization promotes sustainable practices aimed at strengthening resilient ecosystems and economic vitality according to the official website. It utilizes nine research and extension centers across California’s diverse ecosystems according to the official website and has gained recognition for linking research directly with community needs according to the official website. As part of the University of California system managing Cooperative Extension services according to the official website, it conducts over 33,000 educational events annually with support from more than 18,000 volunteers according to the official website.
Gardeners seeking further information about specific weeds such as creeping woodsorrel or Bermuda buttercup are encouraged by UC Master Gardeners of Yolo County to consult resources provided by UC IPM’s webpage.
