How to Build a Concrete Block Rendered Planter?

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Planters are a great way to utilize space in your garden or backyard. However, store-bought planters can be expensive and not always suited to your specific requirements. With a little effort, you can create an affordable DIY planter that is both functional and attractive.

Building a concrete block-rendered planter is easier than it seems. In this article, we’ll show you step-by-step instructions on how to create your own unique planter that will add character and charm to your outdoor space.


How To Build A Concrete Block Rendered Planter?

Concrete block-rendered planters are an elegant and durable addition to any outdoor space. If you’re looking for a fun DIY project, building a concrete block planter may be just the thing for you. Follow these steps to build your own concrete block-rendered planter:

First, Gather Your Supplies

You’ll need thirty-six concrete blocks (sixteen for each layer with four blocks leftover to cap it off), construction adhesive, and exterior paint or stucco mix.

Mark Your Area And Prepare The Foundation

Select an area in your yard where you’d like to place the planter. Use spray paint or marking chalk to mark out a rectangular shape that is slightly larger than the size of the base layer of concrete blocks. Dig out enough soil so that the bottom layer of concrete blocks is level when sitting on top of compacted soil mixed with gravel.

Lay Your Base Layer Of Concrete Blocks

Apply construction adhesive along one edge of each block before placing it on its side in the rectangle shape you’ve marked earlier, continuing around all four sides until you have a single layer complete.

Add The Second Layer Of Blocks

Apply construction adhesive generously at both ends and in the middle of each block before placing them down so they bridge two below them on the first level. Offset this row by 1/2-block length relative to what was immediately below life.

Repeat Steps Until Final Row Is Reached

Build up layers evenly until there are three or more rows high enough to accommodate whatever plants you want to grow in your finished product.

Fill The Plant Bed With Soil And Add Plants

Use potting soil inside the bed and then plant whatever type(s) of greenery suits your fancy- vines, grasses, shrubs, etc.

Add Finishing Touches With Exterior Paint Or Stucco Mix

The last step is surfacing your work appropriately; use quality exterior paint made specifically for masonry surfaces or alternatively apply a couple of coats using a premixed stucco kit according to the manufacturer’s detailed directions. Wait until dry before going ahead with planting. There you have it – enjoy the fruits of your labor!


How Do You Waterproof The Inside Of A Concrete Planter?

If you are an avid gardener and have concrete planters, you might have encountered the problem of water seeping through the concrete. This can cause damage to your plants and make the planter look unsightly. However, there are solutions to this problem.

Here’s a detailed guide on how to waterproof the inside of a concrete planter.

Clean the Planter

Before starting any waterproofing project, it is essential to clean the planter thoroughly. Scrub it with a stiff brush or use a power washer to remove all traces of dirt, grime, and old paint or sealant, if any .

Sandpaper and Patch Cracks

To prepare the surface of the planter for waterproofing, check for cracks on its surface. If there are any cracks or holes in it, use sandpaper or cement adhesive filling to level out these imperfections.

Apply Waterproof Coating

There are different types of waterproof coating that you can apply on your concrete planter – the most commonly used one is silicone-based products. Apply the first coat as per instructions provided by the manufacturer using a brush or roller. Wait for it to dry completely before applying the second coat.

The second coat should be applied perpendicular (90 degrees) from the direction of the first coat which provides better protection against water.

Enhance Durability With Sealant

Once you’ve applied a few coats of waterproof coating, letting it dry in between applications, it’s advisable to protect your work with sealant. It will provide an extra layer of durability against water damage while enhancing its appearance.

Protect Plants

After applying all coatings as necessary, let them dry completely before adding soil and plants to your newly waterproofed concrete planters so that coatings don’t mix in with the soil. While planting, make sure not to bunch plants too near causing root rot which may damage over time.


What Are The Materials Needed For Making Concrete Planters?

Are you a fan of DIY projects and gardening? If so, making your own concrete planters can be a fun and rewarding activity. However, it is important to have the right materials to ensure that your planters are sturdy and long-lasting. Here’s what you’ll need:

Portland Cement

The main ingredient for any concrete mix is Portland cement. This type of cement bonds well with other materials and creates a strong end product. You can purchase Portland cement at most hardware stores or construction supply centers.


Water is necessary for mixing Portland cement with other materials, such as sand or gravel. The amount of water needed will depend on how much cement you are using, so it’s best to follow a recipe or specific instructions for mixing.

Fine Sand

Adding sand to your concrete mixture helps create a smooth finish on the surface of your planter. Fine-grain sand works best, as larger grains may cause an uneven texture.

Gravel or Coarse Aggregate

While not necessary, adding gravel or another coarse aggregate to your concrete mix can give your planter extra structural support. This is especially helpful if you plan on keeping large plants in your finished product.

Molds or Forms

To shape the concrete into a planter shape, you’ll need molds or forms. These can be made from plastic containers or purchased pre-made online or in stores.

Concrete Sealer

Once your planter has cured for several days and is completely dry, applying a concrete sealer can help protect it from water damage and weathering.

Protective Gear

Working with a concrete mix can be messy and potentially dangerous without proper protective gear. Be sure to wear gloves, eye protection, and a dust mask while working with these materials.


How Much Does It Cost To Build A Concrete Block Planter?

Concrete block planters are a popular choice for outdoor gardening projects. They offer a sturdy and durable structure that can withstand the elements and provide a long-lasting home for your plants. However, many people wonder about the cost of building a concrete block planter. 

Materials Required:

Before starting the project, you need to gather all the materials required for building the concrete block planter. You will need concrete blocks, construction adhesive, capstones or pavers, topsoil, and plants of your choice. The total cost of these materials will vary depending on factors such as where you live, the quality of materials used, and the size of the planter.

Size Of The Planter:

The size of your concrete block planter would largely influence the expenses involved in constructing it. A smaller-sized planter would naturally require fewer materials compared to one that is bigger in size.

Labor Costs:

It is important to note that building a concrete block planter requires skilled laborers who know how to lay concrete blocks properly. It is best to hire professionals who have experience working with masonry rather than attempting it as a DIY project. The cost of professional labor varies from place to place but can quickly add up depending on how many hours of work are required.

In conclusion, the cost of building a concrete block planter depends on several factors such as material quality, size of the planter, and labor costs.

On average, adding up all costs together (materials & labor) could range anywhere from $200 – $500 or more depending on location/region and contractor pricing.

Despite this expense though – once completed – your new outdoor addition will be long-lasting and highly functional!


What Do You Put Under Planters On Concrete?

Decorating concrete patios, balconies, or even your driveway with planters adds a touch of greenery to any space. However, protecting the concrete underneath is important to avoid cracks and staining. So what do you put under planters on concrete? Here are some easy solutions.

Use Pot Feet or Risers

Pot feet, also known as pot risers, are small elevated platforms that can be placed at the bottom of your planter. This will allow air to circulate underneath the planter as well as prevent water from accumulating on the concrete surface beneath it. These feet come in various materials like plastic, rubber, and ceramic.

Place a Tray under Your Planter

A tray helps to catch any excess water that drains out of your planter while watering your plants. This not only protects your patio but saves you time from cleaning up any mess that could have been avoided by having a tray underneath each planter. Find trays made of plastic or metal for outdoor use.

Use Cork Pads

Cork pads work similarly to pot feet and are another great option for elevating and protecting your planters on concrete. They can also be found in adhesive strips that make attaching them an easy task for your resin planters.

Consider Rubber Matting

Rubber matting is perfect if you’re worried about potential scratches from moving pots around on your concrete surface. It creates a barrier between the planter and the surface below and prevents sliding when heavy winds hit.

Make Use of Wheels

Wheels are an excellent choice If you have larger planters that are difficult to move without assistance. Attached wheels allow for easy movement without lifting increasing mobility besides protecting surfaces against scratches caused by movements.


Do You Need To Waterproof Rendered Planters?

Rendered planters can be finished with a range of materials, including lime render, cement render, and acrylic render. While all of these materials offer different benefits for your planter box, not all of them are inherently waterproof.

Without proper sealing or waterproofing, water can seep through the walls of the planter and cause damage over time. In cold climates, this can even lead to freezing and cracking when temperatures drop below freezing.

So do you need to waterproof rendered planters? The answer is yes – it’s highly recommended to waterproof your rendered planters to protect them from moisture damage.

The good news is that it’s easy to do so. There are several products available that seal and protect rendered surfaces from water damage. One popular option is a clear penetrating sealer that forms a hydrophobic barrier that repels water while still allowing the surface underneath to breathe.

Alternatively, if you want a more decorative finish for your planter box, you could use exterior masonry paint with built-in waterproofing capabilities. This will not only help protect your planter from water but also add some color or texture to its appearance.

In summary, it’s important to understand that rendered planters should be protected from moisture damage by being sealed or otherwise made waterproof. By taking this simple step, you can ensure your beautiful planter boxes remain in good condition for many years of enjoyment.


Do Concrete Blocks Make Good Planters?

One of the biggest advantages of using concrete blocks as planters is their durability. Concrete is a sturdy material that can withstand harsh weather conditions, including high winds and heavy rains. Planting flowers or vegetables in concrete blocks can also be an affordable way to create a garden bed or growing space. Additionally, concrete blocks offer a modern and industrial aesthetic that can add visual interest to any outdoor space.

However, there are also some downsides to using concrete blocks as planters. One of the main concerns is drainage – if you’re not careful, water may accumulate inside the block, causing soil erosion or rotting roots. It’s important to ensure proper drainage by drilling holes in the bottom of each block or lining the walls with landscape fabric to prevent water buildup.

Another disadvantage is that concrete blocks can heat up quickly in direct sunlight, which could damage delicate root systems over time. To prevent this problem, it’s recommended to paint or coat your concrete blocks with reflective white paint or wrap them with reflective film.

Overall, if you’re interested in creating planters from concrete blocks it’s totally possible! Here are some tips to help you get started:

– Drill holes in every block before planting

– Line the edges of each block with landscape fabric

– Use lightweight potting mix instead of regular soil

– Raise your planter off the ground by setting it on cinderblocks

– Water regularly but not too often since excess water could cause root rot.


What Are The Best Things To Put In The Bottom Of Concrete Block Rendered Planters?

Concrete block-rendered planters are a great way to add some greenery to your home without taking up too much space. However, it can be confusing to figure out what materials to put in the bottom of the planter before adding soil and plants. Here are some options for you to consider:

Gravel or Rocks

A simple solution for the bottom layer of your concrete block-rendered planter is using gravel or rocks as a filler material. It promotes healthy drainage, helps prevent water logging, and makes it easier for air to circulate in the soil. Large-sized stones can be used underneath a smaller layer of gravel as an effective way of stopping soil from washing through when you water your plants.


Sand is another affordable option that can help with drainage issues while maintaining adequate stability at the base of your planter box. Some gardeners prefer sand because it can also make it more challenging for squirrels, rats, or other pests to burrow into their gardens from below.

Plastic Bottles or Containers

If you have got plastic bottles lying around and want to put them to good use for your planters, start by cutting off the bottle’s bottoms first. Then place them upside down on the base of the container before filling up with soil. These plastic bottles act similarly to rocks, giving room for better drainage and preventing soil compaction in one spot – this trick is useful if you live in areas with harsh winters where frost heaving can push planters upwards.

Landscaping Fabric

Landscape fabrics contribute greatly towards maintaining air pockets within potting mixes while keeping weed growth at its minimum level. By installing landscaping fabric on top of rock layers in concrete block-rendered planters gives extra protection against root rot – all without sacrificing freedom of movement for moisture distribution.

Potting Mix Cavity

Last but not least, creating a cavity filled with potting mix instead of solely having rocks at the bottom end of your concrete block-rendered planters could work just as well.

This method allows water retention without compromising on airflow and provides necessary nutrients that benefit roots that reach downwards over time.


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