No - most do need to be blanched, but not all. I freeze summer squashes without blanching, just slicing and freezing. Tomatoes can be frozen whole. This is an excellent way to have fresh-tasting sauces all winter, and the skins just slip right off once the tomatoes are partially thawed. I also freeze corn straight out of the garden without shucking, then microwave still frozen and still in the husks - tastes like summer!
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