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My wife's favorite planter is one that has a removable shade cloth. I built a frame to hold the cloth, so she can shade it in the heat of summer then open it up as it gets cooler. This has helped her get a longer growing season. Some do a hoop structure, which we might do. But we're still doing a lot of structure stuff.

Yes, the above is temporary. I plan to get a full cover w/ 60% light transmission next spring and set it up. I like using cattle panels for the frame....easy up, easy down.