How to Protect Decks From Planters

Moisture is a serious problem for wood decks, and it can eventually lead to rotting, cracking or mold-growth. While greenery on a deck looks lovely and adds to your exterior decor, water from your planters can become a major concern. For deck wood to last, it needs proper protection from the water that can become trapped beneath your planters.

Protect decks from the dampness associated with planters.

Step 1

Stain the deck soon after installation to protect it from moisture and weathering. Use a paint roller with a long handle to apply the stain, as directed by the stain manufacturer’s instructions. Older decks may require cleaning or sanding before the stain can be applied.

Step 2

Place large planters that don’t require frequent watering on concrete blocks. The concrete blocks should be 5 inches larger all-around than the planter base. The concrete will absorb the excess moisture from the planter, thus protecting the deck itself.

Step 3

Sit smaller planters that need more frequent watering into planter pans or water trays with lips at least 2 inches high. Excess water from the planter will collect in the pan rather than dwelling on the wood.

Step 4

Water plants with a watering can when necessary, and take care to direct water completely within the planter.

Step 5

Sweep up leaves fallen from plants in the planters with an outdoor broom. If leaves are left on the deck too long they can discolor the wood and ultimately lead to mildew and rot.

Things You Will Need

  • Wood stain
  • Roller with long handle
  • Concrete blocks, 3 inches thick
  • Planter pans
  • Watering can
  • Broom


  • Flat, tile-like concrete blocks are available from most garden centers, as are planter pans and water trays.
  • Leaves collected from your deck can be added to a compost pile.

About the Author

B.T. Alo is media director, chief writer and editor for a U.S.-based marketing and consulting firm. He holds a bachelor's degree in business and communications. Alo's interests include business, investments, electronics, personal finance, health, communication, popular trends and travel.

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