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I believe you will find that the zucchini plant will greatly outgrow your small growing area as the plant will continue to grow as it puts on fruit throughout its growing season. I bet you'll find that the plants will get so big that they will actually fall out of your pallet container even before they start producing. I grow zucchini every year in a conventional garden and they need lots of space to sprawl out. If you want to grow one in a container, you might try growing one in a very large tub, maybe like an old wash tub which would give you that rustic look, or even a half whiskey barrel.