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Old 10-11-2005, 03:13 AM
 
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Default Frost bitten cactus getting brown, what shall I do next?

If it were mine I'd trim back to sound tissue and I'd be sure to clean
the tool between cuts with bleach or alcohol.
The cut surface should suberize ( form a hard callous) and it may
branch below the cut when growth resumes.
Keep it on the dry side.
Are you sure it's a cactus and not some euphorbia?