Is it the garden or the grass that's full of weeds? My understanding is that TruGreen primarily provides lawn treatments (but I haven't used such a service, so I could be wrong).
If it's a garden area, know that any unplanted patch of ground will eventually get "volunteer" plants--could be desirable ornamentals propagating, relatively harmless weeds, or more invasive plants. In our relatively moist climate, these plants can establish and grow quickly. Don't bother with weed fabric, as it does nothing to stop propagation from on top of the soil. Using a balanced occasional fertilizer can help, as some weeds tend to thrive in soils that are nutrient depleted or are over-rich in one nutrient or another. Mulching helps somewhat, as it creates a surface where it's harder for weeds to root down and easier to pluck them out. One of the best defenses is having a carpet of healthy groundcover plants that outcompete weeds for light, space, and nutrients. All of that said, everyone *will* get weeds. In a garden, there aren't really selective herbicides you can spray. (For lawns, there are some herbicides that target broad-leaf plants, without harming grasses.) Expect that in the warmest part of the growing season you will need to remove weeds about every two weeks. If they are among desirable plants, the only thing you can do is hand pull or very carefully spot treat with an herbicide. Know also that your neighbors' adherence to weed eradication will effect your yard, for better or worse. As long as their are weed seeds or stolons nearby, they will find their way to you.
For what it's worth, the cancer concerns about Round Up aren't typically put in context. It's not that I particularly recommend the stuff or regularly use it myself. That said, it is the *least* toxic herbicide to humans in acute exposure, and it is the herbicide that is known to break down the fastest in the environment--as fast as two days. That's one of the reasons it became so popular. (It does have acute toxic effects on some invertebrates and fish.) We also don't know the threshold of exposure that may contribute to cancer. The International Agency for Research on Cancer classes it as a probable carcinogen, but the EPA does not believe glyphosate is a risk to humans. So far, the people who have successfully collected damages in lawsuits are people who were exposed regularly, over years, and without adequate PPE. If I had a difficult-to-erradicate plant, like bamboo or ivy or a large area of an invasive, like garlic mustard, I wouldn't hesitate to use Round Up, even as someone who mostly sticks to organic practices (native plants, beneficial insects, insecticidal soap when necessary, etc).
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