This post was updated on January 15, 2024
Deck Stain Turns Black from Tree Pollen
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When Your Deck Stain Turns Black from Tree Pollen, what happened and how to fix it?
You’ve followed all the steps to ensure your deck stain project has a beautiful finish. You properly prepped it, allowed for it to dry before staining (unless you used Restore-A-Deck), then stained it meticulously in a beautiful semi-transparent finish. However, you are left with black mildew spots on the finished wood surface down the road. How did this happen?
Black Mold from Tree Pollen
We hear complaints about this problem within our community, and we’ve seen it with our own eyes when we survey wood decks. One thing you may have not considered is whether the deck is near a pollinating tree. Tree pollen can fall on a drying oil-based deck stain project and promote the growth of mildew which causes the black specks or spots. To prevent this, make sure you start your wood stain project when your trees are not going through their peak pollination phase if using an oil-based stain. If the pollen falls on the drying wood stain, it can attach to the surface of the wood, promoting the growth of mildew. Always make sure you are properly cleaning your wood deck prior to brightening and staining as well.
Another option to avoid this from happening is to use a water-based deck stain. The best brands we have used and tested for a water-based penetrating semi-transparent stain would be the Restore-A-Deck Wood Stain and the Defy Extreme Wood Stain.
If your deck has turned black due to tree pollen, it is important to recognize and tackle the problem. Stripping the wood using a quality wood deck stain stripper or wood deck cleaner will remove the mildew. Pick a high-quality stain that contains mildewcides and mold inhibitors, as low-quality stains can be a source for mildew growth themselves. Proper maintenance includes a light wash every couple of years followed by a recoat of the same quality deck stain. As always, make sure your wood surface is not around any tree pollen before tackling a deck stain project.
Best Cleaner for Removing Mildew from Trees
The RAD Guard will remove the black mildew and green algae stains from your wood and deck stains and will prevent them from returning for 1-2 years: RAD Guard Mildew and Algae Cleaner and Preventer
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As an article and comment contributor to the site, Scott has been around the pressure washing industry since attending college. In 1993 he started his first company called Oakland Pressure Wash specializing in exterior pressure washing and deck staining. That company evolved into OPW L.L.C. shortly thereafter concentrating more on exterior wood and deck restoration. Scott and his Deck Cleaning Michigan company have restored over 10,000 decks in the Metro Detroit area since the early years. He has become an authority in the deck restoration industry and has contributed to numerous wood restoration forums and informative sites.
All the products he suggests through this site are sold through online sites and in retail stores, allowing the consumer to choose their own means of purchase. Scott’s eCommerce sites do sell many top brands he endorses and if you appreciate any of the help he has offered then feel free to purchase from one of them.