Concrete Planter

Introduction: Concrete Planter

Step 1: Tools & Supplies

What you will Need?
-   1x Bag of concrete
-   4x Cups
-   Concrete formwork
-   Silicon
-   Corking Gun
-   Soil
-   Succulents (your choice of plants)

Step 2: Cut the Formwork

1. First create your formwork     
300mm x 300mm x 80mm    
Box made from any scraps of timber you have.    
(I found a piece of melamine chipboard in my local council clean up.)

Step 3: Screw Together

Screw together rather than nail, so it can be taken apart easily. This also allows you to put the formwork back together if you wish to make another planter. 

Step 4: Silicon the Edge

Run silicon along the edges so the concrete does not drip from any gaps there are in your box. It also provides a good edge to your final concrete.

Step 5: Pour the Concrete

Mix up concrete and pour into box up to 60 mm
Whilst still wet place in 4 cups to create the shapes for the plants to grow in.
(Plastic cups are better because they are easier to get out after the concrete has set.)

Step 6: Vibrate Concrete

Vigorously vibrate the concrete to get rid of any air bubbles in the concrete. This can be done by tapping the formwork with a hammer all around the edges. Or you can use a electric sander on the formwork which provides good constant vibration.

Step 7: Remove Formwork

Let the concrete set for at least 24 hrs before removing from the formwork. Inspect your concrete form and at this stage of the concrete setting you will be able to smooth out any rough edges or bumps with some sand paper or electric sander.

Step 8: Preparing the Planter

Once the concrete has set for a further 24 hrs use some more silicon inside the holes made from your cups. Completely covering the inside of the shape.

Step 9: Planting

Once the silicon has set for the required time (generally 24hrs) place some good soil and any plant that is able to grow in a area where there roots aren't able to spread out.

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    4 Discussions


    5 years ago on Introduction

    Yours look smooth and bug-hole-less! How long have you been bubbling out? ( vibrating) My projects of planters seem taking forever to vibrate, though still bug-holes on the surface :(


    Reply 5 years ago on Introduction

    When working with concrete (cement and aggregate) you normally add water...when doing this pending on the roughness or the smoothness wanted, this can be justified by the viscosity of the product created. More water the concrete flows better and is easier to get bubbles out, however with adding more water the possibility of shrinking and cracking becomes more likely.

    I tend to enjoy a cleaner finished product so I try to have a little more water that what is required, but the nature of concrete is to be a rough material so having some edges that are not perfect complement the material selection.

    I think your pot turned out great but if you want to have a smoother finish add a touch more water and vibrate the heck out of it to get the bubbles out. Another option is when you start adding concrete, add a little (maybe 2-4" deep) and the vibrate it and some more and vibrate again and do this until you are done filling the form.


    6 years ago

    Thanks for the comment. the silicon is there to stop damahing the concrete as well as create a water tight area so the plant can hold water.


    6 years ago

    Looks great and very nice instructable! Do you line the holes with silicon so the water doesn't permeate the concrete and thereby damage it?