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We're going to do something very similar to this in between our raised beds to grow pea plants on this summer. It will be like a living tunnel for the kids to play in.
Raised beds are a popular way to grow vegetables, and there are all kinds of styles. This raised bed is really done nicely. It can be covered as seasons change by spreading bird netting or greenhouse plastic over the pvc arches, plus tall plants can be grown on the trelises. Click on the link and take the time to read the comments. (No plans given, but the picture seems easy to figure out.)