Is your dryer vent killing your foundation plants? Construct a simple 3 sided guard for your exterior dryer vent to prevent winter kill of foundation plantings. In autumn it should be placed directly in front of the vent, and just a little taller than the top of the vent. The warm moist air will be directed up to prevent constant thawing and refreezing of the plants. Use scrap decking lumber, or coat with an exterior paint to match your siding.