The Best Materials for Raised Garden Beds: Pros and Cons ~ Homestead and Chill

Last Updated on February 19, 2025

What is the best material for raised garden beds, you wonder? Well, that depends on your personal preference, style, budget, climate, and the materials most available to you. Let’s explore some popular options, including the pros and cons of each choice.

When you hear “raised beds”, most folks likely conjure up images of wood planter boxes. Wood certainly is a common (and excellent!) choice for garden beds. However, you can use a variety of other materials to make raised garden beds too.

This article will go over the most common (and not-so-common) materials used to make raised garden beds – including wood, metal, concrete, and more. We’ll discuss things to consider when choosing materials such as durability or safety, as well as the differences between various types of wood lumber. Finally, don’t miss the list of potential raised bed materials that we suggest to avoid for organic gardening.

RELATED: See our step-by-step guide on how to build a durable wood raised garden bed here. Or, explore the pros and cons of raised garden beds vs in-ground gardens.

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Common Materials to Build Raised Garden Beds

Wood lumber, including hardwood or softwood options
Metal, such as corrugated metal or galvanized steel tubs
Bricks, cinder blocks, or concrete blocks
Felled logs
Poured concrete
Wine barrels
Straw bales
Large natural stones, cobblestones, or stacked rock walls
Pallets, fence boards, or other upcycled wood
Other miscellaneous containers or materials

Balancing Longevity, Cost and Safety

In addition to the list above, you could create a raised garden bed out of just about anything capable of holding soil and plants! A kiddie pool, used tires, scrap wood found on the side of the road… the options seem endless. However, there are a number of factors to consider when deciding the best materials to go with. Not all are created equal.

Longevity

Select strong, durable materials to make raised garden beds if you want them to last. After all, garden beds are subject to near-constant moisture, outdoor elements, and potentially insects or pests such as termites.

Plus, soil is heavy – especially once it’s wet! The more soil mass present (such as in a large or tall raised garden bed) the more pressure will be exuded on the bed walls. In that case, thin wood boards will readily bow or rot compared to thick quality boards. Even using the best lumber, concrete or some metal beds will outlast wood raised beds, especially in wet climates.

RELATED: Check out 7 ways to make wood raised garden beds last as long as possible, with information on sealing, silicone and more!

Cost

Most often (but not always!), cost is directly linked to durability. High-quality materials that cost more have the potential to last decades or longer. If you opt to save money upfront and choose more affordable materials, you might be sacrificing the lifespan of your raised bed.

For example, a planter box constructed of reclaimed pallets or soft pine wood likely won’t hold up even half as long as one made with premium lumber. Similarly, quality metal raised beds should last far longer than cheaper knock-offs. Likewise, large stones or concrete blocks will cost more than straw bales, but last a literal lifetime in comparison!

Now, that doesn’t mean you have to spend a fortune to make raised garden beds. Depending on your situation, you may be more than willing to give up a little lifespan to keep upfront costs down – especially if you’re renting your current home, or only setting up a temporary garden space. There are also plenty of ways to be resourceful and find a great deal. Hit up your local Craigslist, Facebook marketplace, junk yards, and more to forage for materials.

Finally, be sure to shop around and compare prices. For example, we are able to find great deals (and a larger variety of materials) for stones, blocks, gravel, bulk soil and mulch at our locally-owned landscape supply companies. However, lumber from the local shop has proven to be cost-prohibitive, and is far more affordable at the big box hardware stores.

A large swathe of soil with compost and wood chips for mulch is surrounded with many large logs of varying height stood straight up and down. Using downed logs as a material for raised garden beds is a great way to re-use fallen timber. — A raised garden bed made of halved log rounds. My friend Katie (@frecklesandsprouts) created this rustic masterpiece from felled trees on her property.

Three chickens are in the foreground with a raised garden constructed with taller rounds of logs. Tall squash plants are poking up out of the top of the raised bed. — Another one of Katie’s (@frecklesandsprouts) log beds. So clever, attractive, and in her case – free! She made them even more sturdy by securing a cable around them.

Safety

There are tons of creative and budget-friendly raised garden bed “hacks” out there – but I urge you to use some common sense! For instance, I would think twice before using painted or treated salvaged wood to create a garden bed for edible crops. Especially if the age and origin is unknown! The wood may be contaminated with toxic chemicals like lead, arsenic, or other heavy metals that can migrate (leach) into your soil and food. Even though modern pressure-treated wood is less toxic than stuff they used to make, I still advise against using it.

I’ve seen people use all kinds of up-cycled materials to make garden beds: like styrofoam coolers (made of polystyrene, a suspected carcinogen) or old car ties (contain benzene, polycyclic aromatic hydrocarbons, heavy metals, and a host of other substances that are toxic to human health). While I applaud the effort to reuse items in the name of sustainability, I personally don’t think it’s worth the risk. See the section below for a complete list of materials to avoid.

Three used tires are being used as planters for annual flowers amongst a sea of green and flowering plants. Be sure to avoid using unsafe materials for raised garden beds if you are going to be growing your own food. — For flowers? Maybe. But I don’t suggest growing food in old car tires.

Types of Wood to Make Raised Garden Beds

Cedar or Redwood

Cedar and redwood are the two best choices of wood to build raised garden beds with. They’re both very durable, beautiful, and naturally resistant to moisture, rot, and even termites. The cost of each can vary significantly depending on where you live. We’ve found that redwood is more affordable on the west coast, while cedar is more readily available and thus less expensive in the eastern US.

Raised garden beds made from redwood or cedar should last a decade (or two) – or even longer! Water storage tanks used to be constructed of redwood, after all! Cedar and redwood are both technically “softwood” lumber, yet the high levels of natural tannins (what repels rot and termites) found in both makes them significantly more durable than other softwoods. With a higher tannin content, redwood is rumored to last a few years longer than cedar – especially if you use heart redwood.

As you’re browsing the lumber department, you should see options for “common grade” redwood or heart redwood – sometimes referred to as construction heart, ‘con heart’, or heart-B redwood. We build raised beds from heart redwood, which is more dense and therefore more long-lasting than common grade or sapwood.

As much as possible, choose lumber with an FSC certification. The Forest Stewardship Council certifies lumber that comes from “responsibly managed forests that provide environmental, social and economic benefits”.

DeannaCat is grabbing a redwood 2x6 board for inspection from a shelf full of boards. There are multiple shelfs with varying sizes and wood materials that spans a height of at least 8 feet. — Shopping for lumber. We use heart redwood (con heart) 2×6″ boards that are FSC certified. Always keep an eye out for crooked or bowed boards, and avoid them!

Other wood options for raised beds

In general, hardwood lumber is more dense so it offers a superior level of durability and strength over softwood lumber. Examples of long-lasting hardwood lumber include teak, maple, beech, hemlock, walnut, black locust, and oak. Wine barrels are made of oak, both to enhance the flavor of wine but also to provide incredible moisture-resistance and longevity. See tips about using wine barrels as raised garden beds here. While strong, hardwood trees grow more slowly and are therefore far less common in construction than softwoods.

Popular softwood lumber includes Douglas fir, pine, spruce, and juniper. These options are typically more affordable than redwood or cedar, though not quite as durable. Raised garden beds made from these softwoods are known to last about 4 to 7 years on average (compared to 10 to 20 years for cedar or redwood), depending on your climate.

Another thing to consider is lumber size. The thickness of your wood boards directly impacts your garden bed’s lifespan too. A raised garden bed constructed of 2” thick boards will outlast a bed made of 1” boards or ½” thick fence boards – by far! We use heart redwood 2×6” boards to build our raised beds.

A backyard image looking toward the house and patio. There are two wine barrels that have a tomato seedling in each one, beyond that lies raised garden beds that create a fence to the concrete patio. Materials for raised garden beds can vary, depending on your location. — Our back yard garden (a few years ago, when we still had grass!) We built redwood raised beds around our patio, and attached trellises to the back to also double as chicken-proof fencing. We also use wine barrels to grow tomatoes, turmeric, cannabis, herbs and more.

Should I seal my wood garden bed?

This is another one of those “it depends” situations! Redwood and cedar definitely do not require a protective sealer, but may benefit from it in climates with high humidity or precipitation. If you do opt to seal your wood garden beds, choose a non-toxic sealer, such as Garden Seal or Hope’s Natural Tung Oil. Softer wood options will benefit from the added protection of a sealer even more. Follow the manufacturers recommendations for how often to apply a fresh coat.

In the past, we never sealed our raised beds since we live in a fairly dry climate. We love the way that redwood naturally ages, untouched. It starts off a beautiful pink color, turns to a slightly amber tone within a year, and then fades to a beautiful beachy-barnwood grey. Cedar also gracefully ages with time, changing from reddish tan to silver grey (unless a sealer is routinely applied).

Since moving to our new homestead and building our forever-garden, we did opt to seal our new redwood raised beds with several coats of Garden Seal to extend their life. Learn more here.

The back patio contains a newly constructed raised garden bed on its side with various pieces and lengths of wood scattered about that are to be used for another bed. There is a drill, gloves, and a box of screws sitting atop the completed raised bed while two chickens look inside into the patio through the arch pathway. — A brand new heart redwood bed. In the background, older heart redwood beds (about 3 years old) that were not sealed and aged to grey.

Freshly built, sealed and filled redwood beds in our newer garden space.

Metal Raised Garden Beds

Metal raised garden beds are the new “it” thing! They’re modern, sleek, and incredibly durable. Metal raised beds are also usually more affordable and easier to assemble than wood beds. Unlike wood, metal beds will not rot over time, swell and shrink with moisture, or require much upkeep. That said, galvanized steel raised garden beds are a great choice for wet climates, or someone will fewer tools or DIY skills!

There are a number of metal garden bed options. You could make your own with sheets of corrugated metal as sides within a wood frame. Or, turn a prefabricated metal container into a raised garden bed – such as adding drainage holes to the bottom of a galvanized steel animal feed or water trough.

The easiest option is to use a metal raised garden bed kit. My friend Kevin at Epic Gardening sells the best ones on the market! Birdies raised beds are incredibly high-quality, durable, and lightweight but sturdy. They come in a wide variety of shapes, sizes, and colors to fit every garden space. Use code ‘deannacat3’ to save 5% off Birdies beds here!

No matter which direction you take, be sure to use galvanized and/or powder-coated metal so the beds won’t rust!

A long rectangular corrugated galvanized metal raised garden bed is sitting on grass. There are various flowers, herbs, perennials, and pepper plants planted amongst the bed. — A 6-in-1 Birdies metal garden bed kit. Use code **‘deannacat3’ to save 5%** on Birdies Beds from Epic Gardening.

Do metal raised beds get hot?

Some folks worry that metal garden beds will make their soil hot, but it’s nothing to be concerned about. Even if the metal feels warm to the touch, damp soil does a great job of buffering temperature swings, especially paired with good irrigation practices and mulch.

The soil in metal beds may get a couple degrees warmer around the edges, but not in a way that negatively impacts plant growth. I’ve read comparisons that showed the internal (center) soil temperature was similar in wood, cinder block or metal raised beds – though all three are a few degrees warmer than growing right in the ground. A large metal bed will stay even cooler than smaller versions, as they have more side surface area vs internal volume.

I know many hot-climate gardeners who use metal raised garden beds with no problem. Birdies beds originated in Australia, and their US supplier (Epic Gardening) is down in inland San Diego – both quite hot!

Are galvanized steel garden beds food safe?

Yes, well-made galvanized steel garden beds are totally safe to grow food in! (Note the emphasis on well-made, so choose reputable and well-rated products!) Steel is an alloy of iron and carbon. Through the galvanization process, steel is coated with a layer of zinc that effectively seals it and prevents corrosion and rust. It is very unlikely for notable amounts of zinc to leach from the coating into your soil. It takes very acidic conditions and many, many years for a galvanized zinc coating to break down.

Even then, zinc isn’t a bad guy! Rather, zinc is a mineral naturally found in soil – and an essential micronutrient for plant growth! Plants rely on zinc for healthy root development, for added resilience to cold temperatures, and to support other phytochemical processes such as the formation of chlorophyll. However, if your galvanized steel beds start to visibly corrode on the interior, it is best to play it safe and replace them.

8-in-1 Birdies beds in our new berry patch. These are configured as 10×2′, though the same kit can be configured in 8 different sizes, including a classic 4×8′ raised bed.

Making Raised Garden Beds from Concrete, Brick or Cinder Blocks

Like those made from metal, raised garden beds constructed from concrete pavers, cinderblocks, or brick have the potential to be supremely durable and sturdy. However, this category comes with a few caveats to consider! The installation of concrete block garden beds require a decent level of commitment, especially if you secure them in place with mortar or adhesive. They’re heavy, create a more permanent design than other options, and thus limit your flexibility for change.

It’s possible to make garden beds from pavers or blocks without adhesive (e.g. simply by stacking blocks) if you keep them fairly shallow. Yet you’ll want to secure them in place if you’re creating a bed two feet or taller, in an area prone to heavy rains or flooding, on a slope, or to otherwise create a more sturdy installation. It’s also possible to find interlocking blocks made for mortarless wall systems.

We have made a number of raised garden areas with concrete blocks and secured them with construction concrete adhesive (the same way we made our concrete block greenhouse foundation). The adhesive is probably not entirely non-toxic, but we only used a small bead of glue deep between each block. Also, those beds primarily house ornamental plants over edibles. Be sure to let your adhesive fully dry and cure before adding soil!

The process of building the stone terrace is underway, dirt is pulled away from each wall of the terrace while the pavers are glued together with strong adhesive.. The tubes of adhesive, a level, and a rubber mallet sit on the lowest formed stone terrace wall. — When working with concrete blocks, use paver sand to create a compact and level base below.

A stone terraced corner of a yard that is three tiers tall with various perennial plants and fruit tree planted in each tier. The backdrop is a fence along the back and side of the terrace. A large cactus in a ceramic pot takes up a portion of the foreground. There are pavers made into a landing/steps that lead up to the different levels of the terrace. The sun is shining in casting rays onto the fence in the background. — A freshly terraced slope in our front yard garden, made with concrete blocks and adhesive.

Are concrete blocks or cinder blocks safe for gardening?

Fly ash is a common concern when using pavers, bricks, or cinder block materials to create raised garden beds. Fly ash is a masonry additive that contains heavy metals such as radium and arsenic, and is often used in concrete products for added durability. However, there is very little scientific evidence available that says whether or not those heavy metals readily leach into the surrounding soil. If you’re concerned about this risk, buy your materials from a reputable source where you can ask questions and check specifications to see if fly ash is present or not.

A raised stone planting island is in the shape of a kidney bean. It is stacked 3 stones high and inside the walls is dark,rich soil with various perennial and annual plants planted amongst the area. Two dwarf citrus trees and in the middle of each end. Stone is a good material for raised garden beds if you want a product that will last a long time. — A raised concrete block planting area in our back yard, used primarily for perennial ornamentals.

Natural Stone Raised Beds

Going beyond concrete blocks, you can make long-lasting raised planting areas using natural stone too – such as cobblestones, flagstone, small boulders, or other foraged rock material. Unlike concrete, there is no worry about chemical additives here. Natural stones and rocks can be freely stacked, or mortared/glued in place. Because the shapes and sizes of natural rocks aren’t as cookie-cutter as concrete blocks, the construction will require more imagination and finagling to puzzle-piece them together. Yet the finished result will be even more rustic, artistic, and beautiful – and blend in beautifully in a natural garden setting!

Avoid using these materials for raised garden beds:

Railroad ties. While they seem kinda funky-cool, railroad ties are treated with creosote – a ‘probable’ human carcinogen. Creosote may also inhibit or harm plants growing nearby.
Recycled or reclaimed wood of unknown origin. As we explored earlier, if you are unsure of the origin, age, or treatment of the wood, be leery. It could have been treated, stained, or painted in a way that would introduce toxins into your garden.
Treated lumber, or pressure treated lumber. This one is up for debate with some gardeners. Historically, pressure treated lumber was cured with an arsenic-based compound called chromated copper arsenate (CCA). Arsenic is very bad news, and studies show that it readily leaches from the treated lumber into the surrounding soil. The purpose was to make fairly cheap wood (namely pine) last longer against the elements. Though CCA was banned in 2003 and replaced with various less-toxic copper-based chemicals, I still personally avoid treated lumber. After all, the expected lifespan of redwood and cedar actually outlasts modern pressure-treated pine by several years! So, why choose the chemically-treated materials for your raised garden beds?
Other risky materials such as styrofoam, used car tires, or miscellaneous plastic products (as discussed in the safety section above). If you’re considering a plastic garden bed kit, be sure it is made with food-grade BPA-free plastic.

A view of the front of a blue green house, in the foreground lies four raised garden beds that are filled with cool season vegetables such as kale, mustard greens, bok choy, radish, carrots, cabbage, and cauliflower. There are gravel lined pathways with stone pavers leading towards the house. There are four smaller planting islands that are in ground with perennial and annual plants closer to the house. — Our front yard garden

Decisions, decisions…

Well folks, that concludes this discussion on the most popular materials used to make raised garden beds! I hope that the information provided here will help you make an informed decision on what will work best for your garden. Perhaps you will mix-and-match styles? No matter what, I’m sure it will come together beautifully!

Once you have your beds installed, check out this article all about how to fill raised garden beds with the “perfect” (I hate that word, lol) organic garden soil mixture. Please feel free to ask any questions in the comments below, and share this article if you found it valuable!

25 Comments

Mary W

February 23, 2025 at 5:51 am Reply

QUESTION: What are the best things to use between beds? Here in FL the weeds grow FAST and furious. I tried several different products between beds but the worst was gravel as weeds don’t grow through the weed fabric as much as in the inevitable soil between the gravel bits and FAST and hand weeding takes way more time than gardening to get rid of tons of small plants thriving between the gravel bits. I can weed the paths every week and still have stuff growing. I just got rid of all the pitiful excuse for weed fabric and wish I could get rid of the gravel I did put in one bed. So I’m thinking wood chips – thick layer. It would be neat but not sure how sustainable or effective. I really want a pretty look but cement is out of the question – LOL. I’d love to know what you think. Remember the key words hot, humid FLORIDA. So far you have provided great information for my garden.
- Aaron (Mr. DeannaCat)
  
  February 24, 2025 at 7:34 am Reply
  
  Hi Mary, weeds can be an issue no matter where you live but especially so in warm and damp environments such as Florida. In regards to landscape fabric, it is best and easiest to lay that down before your beds are in place so the beds can sit on top of the fabric. You would also want to get high quality landscaper grade fabric (most of which are graded to last 20 plus years) such as this which can be found at SiteOne Landscape Supply or other irrigation/landscape specific stores.
  
  Now, when it comes to what type of mulch or hardscape materials to use in between your garden beds, we have both bark and gravel in various garden and fruit tree areas and even though we have landscape fabric underneath the mulch, weeds will still root in bark or gravel so there really isn’t an easy way to keep that from happening as seeds from invasive weeds or even flowers from your garden will seed themselves in either material. We use a stirrup hoe to go around our garden area a couple times a year to easily uproot the weeds that are growing, again, they root in the gravel but with the landscape fabric below, their roots can’t get a hold on anything. In your raised beds themselves, you should just mulch your beds with compost which will help your soil retain moisture but it won’t keep weeds from growing in your beds. Hope that helps and reach out if you have any other questions.

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