Planting Grape Vines in Pressure-Treated Wood Boxes on a Deck

A gardener wants to plant grapes in pressure-treated wood boxes on a 5-ft high deck for a pergola. Asks if chemicals harm plants.

Mixed Opinions

Some horticulturists warn against pressure-treated wood (copper, arsenic in older treatments) leaching into soil. Others report no ill effects.

Precautions

• Line box with heavy plastic (pond liner) before adding soil.
• Use newer ACQ-treated wood (arsenic-free).
• Ensure boxes are large (24+ inches deep/wide) for grape roots.
• Provide excellent drainage.

Better Alternative

Cedar, redwood, or composite lumber boxes. Or large fabric pots (Smart Pots).

Contact box manufacturer for leaching data.