Wood has many applications in vegetable gardening. For example, we use it to create raised beds and form the edges of paths throughout the garden. Additionally, most garden benches are wooden, and we use wood frames to create the networks for protective netting.
Unfortunately, we need to stain the wood to protect it from extreme weather, pests, and agents of rot and decay.
So, that leaves us with a big question – is wood stain safe for vegetable garden and soil? Is it safe for us? Let’s find out.
Is Wood Stain Safe for Vegetable Garden?
No, wood stain is not safe for vegetable garden. They can cause many health issues, from breathing to heart issues. Nevertheless, some wood stains are food-safe and not harmful to your vegetable garden. These stains are usually labeled “non-toxic.”
Advantages of Staining a Raised Garden Bed
Although stains can be harmful, staining the wood you wish to use to build raised garden beds is important for several reasons;
- Aesthetic reasons: Wood stains improve the wood’s aesthetic appeal, resulting in a more attractive garden. This is critical as our gardens are both functional structures and home-beautifiers.
- Wood protection: Stains protect the wood from external elements, including weather (sunlight, rain, UV, etc.) and insect and pest attacks. Stains also protect the wood from rot and decay-causing microorganisms.
- Extended life: By protecting the wood from exterior agents, stains prolong the wood’s lifespan, thus the garden’s life.
How Long Does Untreated Wood Last in Raised Garden Beds?
The longevity of an untreated wooden garden bed depends on the type of wood. Naturally, rot-resistant woods, such as cedar, can last 20 years without treatment as their natural oils enable them to withstand pests, decay, rot, and weather elements.
Meanwhile, woods that aren’t naturally resistant to external elements can only live five years on a raised garden bed.
How Long Does a Treated Wooden Garden Bed Last?
Depending on the wood type and treatment frequency, a treated garden bed can last 20+ years. Generally, frequently treated woods last the longest. For instance, a wooden garden bed treated every two years easily lasts 20+ years.
What Type of Wood is Safe for Vegetable Gardens?
Cedarwood beds, especially beds made from western red cedar, are the best wood for raised garden beds . It’s a naturally strong wood that’s often used in construction projects. So, it’s naturally durable.
But more importantly, a cedar raised bed contains natural oil that repels pests and insects and shields the wood from rot and decay-causing microorganisms.
Best Natural Oils for Garden Beds
Natural oils are your best choice when shopping for a wood stain for planter beds. Some of the best products here include;
- Pure tung oil
- Dark tung oil
- Pure linseed oil
- Hemp Oil
- Hardwax Oil
- Walnut oil
- Safecoat Naturals Clear Penetrating Oil
Best Eco-Friendly Stain for Garden Beds
Besides natural oils, you can safely use some bioengineered wood stains on a raised bed garden without adverse effects. The best food-safe stain for planter boxes are;
1. Vermont Natural Coatings Exterior Penetrating Wood Stain
The exterior penetrating wood stain from Vermont Natural Coatings is a water and heat-resistant formula made from natural ingredients for beautiful exteriors and long-lasting durability.
Moreover, it’s a low-VOC product that only requires two coats for maximum surface protection. However, you must apply the second coat while the first one is still damp, as the second coat may not properly penetrate a fully dried first coat. Also, remember to sand the surface for maximum adhesion.
The stain applies easily with a brush, paint, or foam pad. You can also spray it if you wish. Make sure to apply with the wood grain – without thinning.
2. Ecoprocote Eco-Poly Finish and Sealer
Eco-Poly Polyurethane Sealer, Floor Finish, Wood Floor Sealer and Concrete Sealer, Non Toxic Water Based, No to Low Odor, 1 Gallon, Gloss
- HIGH QUALITY SURFACE FINISH: Our polyurethane sealer for wood, floor, and concrete surfaces provides scratch, crack, moisture, UV and chemical resistance, ensuring a long-lasting sheen for your indoor and outdoor projects.
- WATER-BASED, LOW ODOR: Made with water-based polyurethane, this gloss finish sealer is virtually odorless and dries faster than oil-based counterparts.
- MULTI-LAYER PROTECTION: The Eco-Poly sealer is formulated to be highly durable. For best results and optimum sealing, apply a minimum of two coats on the surface for an elegant gloss finish.
- VERSATILE USES: Excellent for applying a protective wood finish to your furniture, cabinets, decks, and wood floor. It can also be used as a masonry, concrete driveway sealer, and concrete floor sealer.
- NON-TOXIC, SUSTAINABLE: The Eco-Poly wood and concrete polyurethane sealer is made with advanced plant-based urethane technology and bio-emulsion resins. It is free of toxic off gassing, VOCs and Red List Chemicals.
Eco-Poly is a polyurethane sealer that provides scratch, moisture, and UV resistance. It’s also resistant to chemicals and can be used for indoor and outdoor projects.
The water-based formula is a low-odor solution that provides a fast-drying gloss finish. We also love that it’s made from advanced sustainable materials for a bio-renewable product, free of toxic gassing, VOCs, and Red List chemicals.
Use a quality brush, pad applicator, microfiber mop, or lambswool applicator for a high-quality finish. You need two coats spaced 15-60 minutes apart. The final coat takes 24 hours to cure fully.
Toxic Wood Treatments To Avoid for Raised Beds
We’ve identified a few toxic treatments you want to avoid, as they’re considered unsafe for humans.
- Pressure-treated wood: Never use pressure-treated wood for vegetable gardens, no matter the wood species. The chemical treatments contain unsafe products, including arsenic and xylene, that can leech into the soil, causing untold health consequences.
- Creosote-treated wood: Creosote is an old-age preservative used by our ancestors to preserve wood and food. Unfortunately, it’s been withdrawn from sale in the domestic EU market due to cancer links.
- Woods treated with oil-based preservatives: Oil-based preservatives penetrate wood excellently, providing deeper protection than traditional paint-on preservatives. Indeed, they’re the basis of many wood stains. Unfortunately, the manufacturers rarely list the full list of ingredients, making it impossible to know whether their products are safe for humans.
- Wood treated some with water-based preservatives: Finally, some water-based boron preservatives are widely considered safe for humans and come in paints and gels. However, these products are highly water-soluble and easily leech into the soil.
Other Ways to Stop Wooden Beds from Rotting
- Choose naturally rot-resistant wood species: Cedar, redwood, mahogany, and bald cypress are excellent choices.
- Reduce contact with garden soil: Ground contact increases the risk of rot, decay, and pest attacks.
- Promote good drainage: A few tips include fluffy, moist, well-draining soils and draining holes. Additionally, never seal the bottom of the bed .
Is wood stain toxic to plants?
Yes, wood stain is toxic to plants. The preservative chemicals in wood stains can damage plants. In addition, wood stains can block the plant’s leaves and stems from soaking up the sunshine or the plant’s roots from absorbing water and nutrients.
What kind of stain is safe for garden beds?
Pure raw linseed oil is the safest stain for garden beds. It’s completely free of additives and, therefore, 100% safe for your garden plants. Pure tung oil extracted from the tung tree is another excellent option. Fortunately, you can find raw linseed and tung oils in many formulations to suit your needs.
Is MINWAX wood finish food safe?
Not necessarily. While some MINWAX finishes are food safe, most aren’t. Even worse, most MINWAX wood finishes aren’t tested for food safety. Therefore, it isn’t easy to know which is safe and which isn’t. For this reason, only treat MINWAX finishes as food safe if the label says it’s “food-safe.”
Do I need to stain my raised garden bed?
No, you don’t need to stain your raised garden bed. However, staining is beneficial if you wish to make the wooden bed last longer without using a liner. Additionally, staining subtly alters the wood’s natural appearance, increasing its beauty.
Can staining a raised cedar bed affect the plants?
Unfortunately, yes. Staining raised cedar planters can affect the plants. First, you’ll notice brown spots on the leaves and fruits if the stain touches the plants. Additionally, the chemical reaction between the soil and the stain can produce devastating consequences, such as altered soil pH.
Can you stain the outside of a raised garden bed?
Yes. You can stain the outside of a raised garden bed if you pick your stains carefully. First, get a wood stain designed specifically for garden use. These stains add excitement to the garden without introducing harmful chemicals. Secondly, be careful when staining. You don’t want to spill the stain everywhere.
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So, Is Wood Stain Safe for Vegetable Garden?
Staining wooden garden beds are beneficial for many reasons. For instance, it beautifies the garden beds, shields the bed from pests and insects, and keeps rot and decay agents at bay. However, it’s even more important to stain wood with non-toxic stains to