What's the best way to protect a cactus garden from frost?

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I planted a cactus garden this summer. We have mild winters here in the central coast of CA. but we do get frost with occasional temperatures below 30 deg. I’ve used burlap but it didn’t work in the past. Should I double sheet the burlap or is there something better to protect my prickly garden?

q what s the best way to protect a cactus garden frost
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