Do Brick Planters Need Liners in Freeze/Thaw Climates?

Homeowner in extreme climate (100°F+ summers, below freezing winters) asks if new 3x2 ft brick/mortar planter needs lining before adding soil.

Answer: No Liner Needed for Soil

Brick and mortar planters don't require liners for standard planting. The mortar joints allow slow moisture exchange, which benefits root health.

Exception: Water Gardens

Only line with impermeable membrane if creating a water feature (lilies, aquatic plants).

Cold Climate Tips

• Ensure drainage holes in bottom
• Use frost-resistant potting mix
• Consider insulating exterior with rigid foam if plants are marginally hardy
• Elevate slightly on feet/pavers to prevent ground freeze wicking