Quick Answer
Not all vegetables require blanching before dehydration, but it's recommended for some to inactivate enzymes that can break down the food's texture and flavor, and to preserve nutrients.
Vegetables That Require Blanching
Some vegetables, like broccoli, cauliflower, and green beans, have high water content and can develop off-flavors or become mushy if dehydrated without blanching. A 3-5 minute blanch in boiling water or steam is sufficient to inactivate the enzymes, making them suitable for dehydration. On the other hand, vegetables like onions, garlic, and sweet potatoes can be dehydrated without blanching.
Vegetables That Don’t Require Blanching
Vegetables like carrots, beets, and squash have lower water content and can be dehydrated directly without blanching. In fact, blanching can cause these vegetables to become soft and lose their natural texture. A temperature of 135°F to 140°F (57°C to 60°C) is ideal for dehydration, and a dehydrator with good air circulation can help preserve the texture and flavor of these vegetables.
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