I’m a gardening and culinary professional with a degree from the Robert Reynolds Chef Studio. My husband, Larry, and I co-own Verdura Culinary Gardens. We design, install, and maintain raised-bed organic vegetable gardens for Portland-area residents who love to cook and would like to work with fresher, more seasonal ingredients.
The best way to prevent this issue is to avoid having grass grow up against the sides of your raised beds. When we install raised bed frames, we remove all sod to a foot or so away from the edges of the beds, then put down landscape fabric and a pathway material, such as crushed gravel or bark mulch. If you were to do this now, you could probably dig out some of those obnoxious roots that have worked their way into your frames. It is extremely difficult to remove grass once it’s grown up into your beds, as you’ve learned. The cardboard trick won’t really help long term because cardboard will eventually break down, plus of course the grass will just work its way in around the edges of the cardboard if you allow the grass to grow right up against the edge of the frames.
Hope that helps, and happy gardening!
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A father’s legacy
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