Q&A for How to Make Concrete Planters

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How long do I have before the cement dries?

Melinda Meservy
Plant Specialist
Melinda Meservy is a Plant Specialist and the Owner of Thyme and Places, a botanical boutique offering plants and gifts in Salt Lake City, Utah. Before starting her own business, Melinda worked in process and business improvement and data analytics. Melinda earned a BA in History from the University of Utah, is trained in lean and agile methodologies, and completed her Certified Professional Facilitator certification. Thyme and Places offers indoor plants and containers, a fully stocked potting bench, and tips on plants to suit your space and lifestyle.

Melinda Meservy

Plant Specialist

Expert Answer

If you're using quick-dry cement, you'll have about 15 minutes before the cement sets.

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Question

How do I make a mold for concrete planters?

Community Answer

Cardboard and tape can be used to make molds. Glass can be used too, but could break if no lubricants etc. are added.

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Question

Is it possible to color the concrete during the process?

Community Answer

You can add an integral color when you mix the concrete or you can color with an acid stain after the concrete has cured. If you use an acid stain, you will need to neutralize the acid with an ammonia/water mixture. Whether you use integral color or acid stain, it is highly recommended that you use a concrete sealer (water based is fine) before using your concrete planter — it protects the concrete and enhances the color.

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Question

What about adding drainage holes?

Nick Adams

Community Answer

An ideal way to do this is to drill a hole through the outer mold that corresponds with the diameter of whatever you wish to create your void. I have used cured bamboo pieces in the past and have cut them to be the height in which the inner mold is to be placed, thus adding an additional means of ensuring proper placement.

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Question

Can I use metal molds instead of wood or plastic?

Community Answer

Yes, it doesn't matter what material is used. The technique should be the same.

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Question

Why are my cement pots cracking?

Drew Hawkins1

Community Answer

There could be a couple of reasons why your cement pots are cracking. If there was excess water in the concrete mix, it can cause the concrete to crack eventually, so it's important that you mix the concrete according to the directions on the packaging. Temperature fluctuations can cause the concrete to expand and shrink, which can cause it to crack over time. Try placing your cement pots in a location that stays a constant temperature to see if that keeps them from cracking.

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How do you seal concrete planters?

Drew Hawkins1

Community Answer

An easy way to seal a concrete planter and keep the surface protected is to paint it. Use masonry paint for the best adhesion and apply 2-3 layers to seal the surface. You could also finish the planter with a layer of clear varnish over the painted surface to help keep out moisture.

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Question

Do I need to seal concrete pots?

Drew Hawkins1

Community Answer

No, it's not really necessary. Concrete is a tough and durable material, and if it's mixed properly, it's not likely to crack or absorb too much moisture. However, you can cover the pots with 2-3 layers of masonry paint to update their look and add a protective coating over the surface.

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