Why do you blanch broccoli?

Online Answer
Giving the broccoli florets and stems a quick blanching in boiling water before freezing ensures that they will retain a good texture when you get around to cooking with them. The single-layer initial freeze prevents the broccoli pieces from clumping together, which is ideal when you only need a cup of it for a recipe.
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In a microwave-safe bowl, combine the broccoli, cauliflower, carrots and water. Cover and microwave on high for 3-6 minutes or until crisp-tender.
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Cruciferous Vegetables Broccoli, Brussels sprouts, cauliflower, and other vegetables in the cruciferous family should be included in your diet without question, but it may not be a great idea to eat these fibrous foods late into the night because they take the body longer to digest, keeping you awake.
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Think quality food-storage bags or airtight containers. They don't have to be anything fancy, but they do need to seal. Trim your cauliflower and broccoli to fit into the storage bags or containers but keep them as whole as possible. The less oxygen that reaches the vegetables the longer they stay fresh..