How to Build a Cinder Block Raised Garden Bed (2024)

DIY | DIY House Projects | Garden Ideas

ByBridget Jo

Last year we installed one Cinder Block Raised Garden Bed. We hopedto do three but our bodies and budget gave out at one.

Great news! We built the other two raised beds this year! Yay!

There’s nothing quite like growing your own food and I’m anxious to get going again this year!

After planting a tad too early last year, we are exercising our patience and waiting for Mother Earth News to tell us when to plant. It’s really quite slick! Just head over to What to Plant Now, click on >view planting dates, enter your zip code and email address, and it will send you a handy dandy email when it’s time to plant! Pretty cool, huh?

How to Build a Cinder Block Raised Garden Bed

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How to Build a Cinder Block Raised Garden Bed (1)

Here’s the area we are workingon. One lonely Cinder Block Raised Garden Bed and a whole bunch of moss with a splattering of grass.

How to Build a Cinder Block Raised Garden Bed (2)

First, we laid out the cinder blocks where we wanted them.

These cinder blocks are 8″X8″X16″ from Home Depot. The long sides of the garden bed have eight cinder blocks and the ends have three for a total of 22 cinder blocks per raised bed.

Note: I called these ‘cinder blocks’ but they are actually concrete blocks.

We plan to eventually add a second row of cinder blocks to match the center raised garden bed. It isn’t necessary but would make it easier on our backs. Perhaps next year!

How to Build a Cinder Block Raised Garden Bed (3)

Of course, the ground isn’t, even so, we either dug a little of the grass out underneath or used a bit of sand to make the cinder blocks line up. It really wasn’t too bad.

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Next, we used painter’s paper, from the paint section at Home Depot, in the bottom of our beds. Newspaper or cardboard works great too!

How to Build a Cinder Block Raised Garden Bed (5)

Then, a half yard of compost/topsoil mix was used to fill both beds. They aren’t completely full but it works!

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What To Put Around Cinder Block Raised Garden Beds

Wondering what all that cardboard is about? I knew you were!

Our original plan was to rent a sod cutter and remove the moss and grass, bring in a load of sand, and lay flagstone around our cinder block raised garden beds.

We decided our budget would like us better if we usedpea gravel and, hey, why not just lay cardboard over the grass and dump the pea gravel right on top?

It was an easier and less costly option.

Steve dug out a trench for edging. We used the black plastic edging but, I have to say, I’m not too impressed. Someday we will have that cool concrete edging!

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What To Plant In Your Cinder Block Raised Garden Bed

And voila! We are ready to plant!

It’s important to consider the fruit and vegetables you and your family will eat. There’s no sense in growing a bunch of green beans if no one will eat them, right?

In this article, you will learn how to determine the best fruits and vegetables to grow in YOUR garden!

Get Your Garden Plan Worksheet Here:

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Now the question is … what do I plant where? Check out these plant companions for ten common vegetables. It’s a great resource for plant friends and foes.

For even more information on plant companions, check out Everything You Need To Know About Companion Planting.

This is a Garden Plan I created:

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Every morning I open our blinds to this fun view. It will be even better when these Cinder Block Raised Garden Beds are full of scrumptious veggies!

Do you see marigolds in the picture above? They aren’t there just to look pretty! Read more about them in 5 Secrets To A Healthy Garden.

I love walking barefoot on the pea gravel. It’s a great way to get a little ‘earthing’ in. I’ll take that over an earthing mat any day! Of course, the beach would be even better but we work with what we have!

Favorite Gardening Resources:

Mother Earth Newswill send you emails when it’s time to plant!

The Old Farmer’s Almanacis where you will find garden friends and foes.

Old World Garden Farmsis one of my favorite gardening blogs. If you love gardening, I would suggest subscribing to their site and you will receive super useful emailsfull of great gardening information just when you need it!

Another helpful blog post isHow To Grow A Vegetable Gardenby Ruth at Living Well Spending Less.

Soil For Raised Beds gives ideas on how to create the best soil for raised beds!

Growing Peppers from Seed to Harvest – The Ultimate Guide – will show you how to grow peppers from seed.

If you want to try your hand at growing your own raspberry bushes, check out this resource.

Grow What You Eat, Eat What You Grow

Garden Ideas

Order your concrete blocks online and pick them up in-store or have them delivered at a flat rate service fee.

Twenty-two cinder blocks, 1/4 yard of topsoil/compost mix and you’re in business! The rest … well, that’s just for fun!

Should You Use Cinder Blocks For Raised Garden Beds?

Update: It has been brought to my attention that it may not be in our best interest to use cinder blocks for our garden beds. There may or may not be heavy metals that will leach into the soil and possibly the plants.

Read more about the use of concrete blocks here:

Is It Dangerous to Make A Garden Bed From Cinder Blocks?

There is also a discussion on the use of cinder blocks here.

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Cinder Block Raised Garden Bed Story

How to Build a Cinder Block Raised Garden Bed (2024)

FAQs

How to Build a Cinder Block Raised Garden Bed? ›

Leaving a 1/4″ gap between every third cinder block, place the blocks hole side up. 20 blocks will give an interior bed area of 4′ x 8′. Leave a side open to bring in the soil until the new bed is filled.

How to make a raised garden bed with cinder blocks? ›

Leaving a 1/4″ gap between every third cinder block, place the blocks hole side up. 20 blocks will give an interior bed area of 4′ x 8′. Leave a side open to bring in the soil until the new bed is filled.

How to use cinder blocks in the garden? ›

Create a Tiered Cinder Block Garden

Use several different sizes of blocks. stack them into a tier or pyramid formation, and fill them with your favorite selection of ornamental grasses, trailing vines, and flowering plants.

What plants can grow in cinder blocks? ›

I planted each of these cloves in its own cinder-block hole. Each one will grow into a full bulb. I also planted two bunches of basil, two bunches of cilantro and one bunch of oregano. Each of these grows in its own cinder-block hole as well.

What is the best block for raised garden beds? ›

Raised beds made of cinder blocks worked best for us. We had the house landscaped several years back, and it was expensive to put those beds in! There were three raised beds made of 16x8x8 cinder blocks stacked two high with water run to each bed.

Is it safe to use cinder blocks for a raised garden bed? ›

Cinder blocks haven't been mass produced with fly ash in the U.S. for 50 years, though. The cinder blocks that you buy in the store today are actually concrete blocks and totally safe. Unless you're using antique cinder blocks, there should be no reason to worry, especially when cinder block gardening for vegetables.

What do I put on the bottom of a raised garden bed on concrete? ›

If you're going to pay for a product to fill your raised beds, again, it should just be really good soil and compost. I only recommend a thin layer of gravel at the bottom of your raised bed and under the edges to help you level the area. Save the rest of your gravel for your garden pathways.

How many cinder blocks for a raised bed? ›

Building a raised bed to last will require some hard labor but after it's done the bed will last for years to come. It will take 32 concrete blocks and 16 caps to build this raised bed. The first anchor block will take the longest to set in place.

What do you lay cinder block with? ›

Start with corner blocks, and use mortar to keep them in place. Place a wooden stake in each corner of the footing, and use a string line wrapped around the stakes to make sure your blocks are straight.

Can mold grow in cinder block? ›

Cinder block walls are strong, long-lasting and resistant to elements such as wind and rain, however, they are still subject to the effects of mold growth.

What not to fill a raised garden bed with? ›

Treated lumber is not a good option for filling garden beds. Most woods can be added to the base of raised beds to fill space, but make sure those woods aren't treated or painted. Plant materials from allelopathic and water-resistant plants should not be used.

How to make a cinder block garden bed? ›

How to Build a DIY Cinder Block Garden Bed
  1. Calculate the Dimensions. A typical cinder block is 8 x 8 x 16 inches. ...
  2. Mark Off the Area. ...
  3. Prepare the Ground. ...
  4. Arrange the Cinder Blocks. ...
  5. Add Another Layer of Blocks (Optional) ...
  6. Fill Perimeter With Dirt. ...
  7. Fill With Topsoil and Plant.
Feb 27, 2024

What is the best bottom for raised beds? ›

Cardboard and Wood Chips: Layering cardboard at the bottom of your raised bed is an effective, cost-efficient way to suppress weeds. It eventually breaks down, enriching the soil with carbon. Wood chips can be added on top of the cardboard as an additional layer for weed control and moisture retention.

How deep should a raised garden bed be? ›

The Best Height for Raised Beds

Keep in mind that beds 18 inches deep or more will have better drainage than shorter beds. While most plants don't need anything deeper than 18 inches, I prefer beds that are two feet deep (24 inches). The extra height is mostly just for the ease and convenience of the gardener.

Does a raised garden bed need a liner? ›

Raised garden bed lining isn't mandatory to have healthy growing plants. But adding raised garden bed lining does provide benefits. Many experienced gardeners recommend lining raised beds for these reasons: It provides insulation for the soil and helps control temperature fluctuations.

What do you layer a raised garden bed with? ›

Our recommended approach involves layering the bed with a foundation of coarse materials like gravel for proper drainage, a layer of garden soil and garden matter, a layer of compost or well-rotted manure, and a top layer comprising high-quality topsoil. This approach creates a fertile ground for vegetables to thrive.

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