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What Not To Do:
Don’t use TSP for washing, you can use just plain water
Don’t forget to set up your block layout before you do anything else
Don’t start painting before the blocks are 100% dry
DIY Difficulty Level | Moderate
Materials For Making DIY Cinder Block Planters
- Cinder Blocks (20) 8″x8″x16″ and (3) 8″x8″x8″
- Work gloves
- Landscape Fabric
- Tin Snips
- 1/4″ or 1/2″ mesh wire- aka chicken wire
- Caulk gun
- Construction adhesive for a caulk gun
- Primer- 1 gallon
– Stix Waterborne Bonding Primer, or primer made for masonry. Have this tinted if you are painting these a dark color to avoid extra coats
- Paint- 1 gallon
-Benjamin Moore Acrylic exterior finish
- Large nylon scrubbing brush
- (2) 9×12 drop cloths
- (2) High nap roller- 9″ (standard)
- (2) 3″ Foam brush– If your cinder block has grooves on the sides
- Soil- 10lb bag
Cinder Block Planters Tutorial Steps
Step 1 | Design The Layout
First, set up your cinder blocks in the arrangement you want your final planter layout to be- make sure to take a photo of your layout! Now count how many of the block holes will require plants and plan for one piece of landscape fabric and chicken wire per hole, as well as soil and the plant.
If you are placing your blocks in your yard, make sure they are on a level spot, otherwise, you will need to make it level.
Hint: Make sure you do this step first. I set up my layout after painting them and the paint hadn’t fully cured so I had to repaint many spots. You will avoid having to add extra time if you decide on your layout first.
Step 2 | Clean The Cinder Blocks
The blocks need to be washed. You can spray off most of the dust with a hose, but you will need to spot wash, using the nylon scrub brush where you see dirt. If you have a pressure washer then use it and skip the hand washing.
Wash the blocks on a driveway or paved surface, not on grass or you will end up doing extra work. Make it easier on yourself and stack a few blocks to use as a table so you aren’t bending down the whole time.
The cinder blocks will be wet when you put them on the drop cloth so don’t let them sit in a pool of water and move them around if necessary or they will take much longer to dry. If it’s sunny, stick them in the sun for speedier drying.
Don’t start priming and painting these if it will rain before you are completely finished unless you are working in a covered area. Moisture will get in and make it very difficult to paint and therefore the tackiness may not go away for quite a while.
Step 3 | Prime The Cinder Block Planters
For priming, make sure the blocks are completely dry otherwise, the paint will peel off from the moisture leftover in the blocks. Apply the primer with one of the 9″ rollers. I used the second roller for applying the paint since it’s so difficult to get primer out of rollers.
Then, after about an hour when the primer is no longer tacky, flip the blocks over and paint the remaining edges and sides. If your cinder blocks have grooves on the sides, then use the foam brush to get between them.
Hint: It’s not necessary to prime or paint any of the bottoms or insides. I primed and painted the insides of the ones that would be visible, but didn’t like the way it looks. You are welcome to do so, but you will likely need more than 1 gallon of primer and paint.
Step 4 | Paint The Blocks
After 4 hours, your primer should be dry enough for your blocks to be painted (check the manufacturer’s instructions). Painting will require at least 2 coats. I did 2 coats and then painted a 3rd because I didn’t have the forethought at the time to get my primer tinted.
The 3rd coat I ended up doing after the planters were in place, just before planting- and that worked out fine.
Step 5 | Apply Adhesive
Once the paint is dry, you are ready for the landscape fabric. Go ahead and flip over all the blocks that you counted that are being planted. I had 10 actual blocks that were getting plants, but 11 holes since the top block was getting plants in both holes.
Cut out the landscape fabric so that it covers the hole and goes up to about 1/4- 1/8″ from the outside edges. ** I didn’t do this- I cut my fabric pieces a little too short which made them difficult to glue.
Measure the size of that piece you just cut. This will tell you what size to cut the bottoms for the rest of the cinder block planters to.
Next, apply the glue to the bottom. It should be about 1/4″ wide strip all the way around.
Construction adhesive takes 24 hours to cure, but after a few hours, you should be safe to position your blocks again. *However, it’s important to wait a day before you actually plant your plants.
Step 6 | Support The Bottom
The weight of the soil when wet can be quite heavy and may be too much weight for the landscape fabric. To combat this, reduce some of the weight using the wire mesh.
Cut the chicken wire to about the size of the hole in the block and then cut a split into each corner do it folds more easily. Wearing work gloves, fold over the edges so that when the mesh is inserted it doesn’t pierce the fabric.
The goal is to get the wire mesh to basically catch on the sides of the cinder block.
Final Step | Add Plants To The Cinder Block Planters
Add soil, then fill in with your plants!