I have been vegetable gardening for over 20 years using raised beds, and my wonderful husband has built every single one of our raised-bed gardens over the years (at least 5 different gardens for us and too many to count for our clients). Raised bed gardening is my favorite way to grow vegetables, but like any method, it comes with its challenges. 

Whether you’re just getting started or have been gardening for a while, I want to help you avoid common pitfalls that can cost you time, money, and frustration. Let’s take a look at the 10 most common mistakes that I see gardeners make with raised beds—and how you can avoid them.

This post contains affiliate links, which means I earn a small profit when you click on the link and purchase my recommendations. Thanks for supporting my small business!

10 MISTAKES I SEE OFTEN IN DIY RAISED GARDENS

Before we get started with the common mistakes made with raised bed gardens here is a quick link for 10 Raised Bed Garden Design Ideas to help you get started in creating your own vegetable growing oasis.

1. USING 1” THICK WOOD BOARDS FOR YOUR RAISED BEDS

One of the most common mistakes is using wood that’s too thin to build the sides of your raised beds. It’s so tempting to buy thinner boards when you’re standing in the lumber aisle, calculating how much just the wood is going to set you back. 

One-inch boards may seem like a cost-effective option, but they are prone to warping, rotting, and breaking under pressure. You won’t be able to enjoy your raised beds for very long before they start having problems. 

I learned this the hard way when I first started gardening. I used thin cedar wood for my raised beds, and they only lasted a couple of years—lesson learned!

What to Do Instead: 

Invest in 2-inch thick boards. Ideally, these thicker boards will be made of a durable wood like cedar or redwood, which are naturally rot-resistant and will last for many years.

If you would like a thinner profile for your raised beds then steel beds are a great alternative to wood and they work great! Great choices for steel are Vego Garden Beds or our Steel Raised Bed Garden Kits.

2. BUILDING YOUR RAISED BED WITH RAILROAD TIES

Railroad ties may seem sturdy and durable, but they’re actually incredibly harmful to your garden—and potentially your health. That’s because they’re treated with creosote, a toxic chemical that can leach into your soil and contaminate your crops. 

What to Do Instead: 

Stick with untreated or naturally rot-resistant woods like cedar to build your beds. If untreated cedar isn’t in your budget, consider alternatives like concrete blocks. 

Just make sure you’re using new materials. If you don’t know the history of something, assume it’s been treated with chemicals you don’t want in your garden. Your veggies (and your body) will thank you!

3. CUTTING CORNERS ON SOIL QUALITY

Bad soil = bad harvest. It’s tempting to fill your raised beds with inexpensive or free soil, but the quality of your soil directly affects the health of your plants. Cheap soil often lacks the necessary nutrients needed to fuel rapid growth for your annual vegetables. It might even be mixed with debris. 

I frequently encounter this issue in many of my clients’ gardens, and we often need to focus on rebuilding healthy, organic soil quality to help them overcome unhealthy plant growth and poorly draining soil.

What to Do Instead: 

Create a high-quality soil blend using compost, garden soil, and organic matter to give your plants the best start. I know it costs a lot more up front, but soil is not the place to cut corners. (Learn more about the best soil for raised beds.) 

4. CRAMMING YOUR RAISED BEDS TOO CLOSE TOGETHER

Proper spacing between raised beds is crucial for accessibility and maintenance. Beds that are too close together make it hard to reach plants, especially if you’re using large tools or a wheelbarrow. 

What to Do Instead: 

Give your garden (and yourself) some breathing room. Aim for at least 3 feet of space between beds so you can comfortably work around them.

The image below is a prime example of how not to place your raised beds. This layout makes it difficult to work in the garden and actually limits the number and size of plants that you could grow if the beds were spaced farther apart.

5. FAILING TO LEVEL YOUR RAISED BEDS

It’s easy to overlook leveling your beds. You’ve spent all this time building your beds, and you just want to plop them down and call it a day. But uneven raised beds can lead to poor drainage, uneven plant growth, and soil erosion. 

What to Do Instead: 

Take the time to level your beds properly when installing them to ensure a stable growing environment. Use gravel or paver sand to build low areas up or dig away dirt as needed. You don’t want to pay for great soil, only to have it wash right out of your beds, right? 

6. PLACING BEDS IN A SHADY LOCATION

Sunlight is essential for most vegetable crops. One mistake gardeners make is placing raised beds in areas that receive too much shade. 

What to Do Instead: 

Be sure to choose a sunny location that gets at least 6-8 hours of direct sunlight daily. If shade is unavoidable, you can still have a garden. You’ll just need to stick to growing shade-tolerant vegetables like herbs and leafy greens.

7. BUILDING RAISED BEDS TOO WIDE

While large beds may seem like a good idea for maximizing your growing space, bigger isn’t always better. I’ve seen several gardeners install 6×6 raised beds, failing to consider how they’ll actually tend and harvest from the middle of the bed until it was too late. 

Beds that are too wide can be hard to work with. The average human can comfortably reach a couple feet in front of them. Any wider than that, and you won’t be able to access the plants growing in the middle of your bed (or the back of your bed if they’re placed up against a wall or fence). 

What to Do Instead: 

A raised bed should never be more than 4 feet wide. Even that width is assuming you can access your bed from both sides. If the back of your bed is up against a large structure, then I wouldn’t go any wider than 3 feet. You need to be able to easily reach all your plants without stepping into the bed and compacting the soil.

The image below shows a before-and-after transformation of a client’s garden. In the top image, the beds are over 5 feet wide and 12 feet long, with no space to walk between them. We redesigned the garden to create a more open, accessible layout with improved airflow,  and a sitting area in the center.

8. MAKING BEDS TOO SHORT

Many beginner gardeners throw up raised beds that are only as tall as one piece of lumber is wide. I get the temptation—this cuts down on the cost of both wood and soil. But it also kinda defeats the purpose of having raised beds in the first place. 

What to Do Instead: 

Raised beds should be at least 10 inches tall, with 12 inches or more being ideal. Taller beds provide better root space for plants and improve drainage. Plus, they’re easier to work with—especially for those gardeners with back or knee issues.

9. FORGETTING TO PLAN FOR IRRIGATION OR WATERING

Watering is a key part of vegetable gardening, but many gardeners overlook how they’ll get water to their raised beds. 

What to Do Instead: 

Whether it’s a drip irrigation system or a simple soaker hose, plan for your watering needs early to avoid the hassle of manually watering during the heat of the season. You might need to reconsider the location of your garden if it’s too far away from a spigot. 

Learn about 5 different ways to water your garden to be successful.

10. MISSING OUT ON SPACE-SAVING VERTICAL GARDENING WITH TRELLISES

Many gardeners miss out on the benefits of vertical gardening by not incorporating trellises into their raised beds. 

What to Do Instead: 

Using vertical space is a great way to grow vining plants like cucumbers, peas, and tomatoes without taking up too much precious raised bed space. Trellises also improve air circulation and make harvesting easier. (Learn more about adding trellises to your space.) 

There you have it—10 mistakes that are all too easy to make if you’re excited to get your garden up and growing without spending a ton of money. I totally understand why some people make these mistakes (and trust me, I’ve made more than a couple of them myself). That being said, avoid them now so that you can create a beautiful and productive space that will last much longer. In the end, you’ll actually save yourself time, money, and frustration.