Modern, minimalist, and surprisingly easy to make—concrete planters add an industrial chic touch to any plant collection. Plus, they’re incredibly durable and you can create custom shapes and sizes for a fraction of store prices. This guide will walk you through the process, from gathering materials to sealing your finished planter.
Materials You’ll Need
| Item | Details |
|---|---|
| Portland cement or concrete mix | Look for “cement mix” or “mortar mix”; avoid pre‑mixed concrete with large aggregate |
| Water | Clean tap water |
| Mixing bucket & stirring stick | Disposable plastic bucket or old container |
| Two containers per planter | One larger (outer mold), one smaller (inner mold). Use plastic cups, yogurt containers, or silicone molds |
| Mold release | Cooking spray or petroleum jelly |
| Gloves & dust mask | Concrete can irritate skin and lungs |
| Sandpaper (optional) | Fine‑grit for smoothing edges |
Step 1: Choose Your Molds
Almost any plastic container works: yogurt cups, plastic bottles, silicone baking molds. The outer mold determines the planter’s outer shape; the inner mold creates the hollow center. For a simple cylinder, use a large plastic cup as the outer mold and a smaller cup as the inner. Make sure the inner mold is at least 1 inch smaller in diameter and shorter than the outer to allow for thick walls.
Step 2: Mix Concrete to the Right Consistency
Wearing gloves and a mask, mix one part cement with one part water (or follow package instructions). Stir until it’s the consistency of thick peanut butter. Add a little water if it’s too dry—but not too much, or it will weaken the final product. The mixture should hold its shape when pressed.
Step 3: Pour and Create the Hollow
Spray both molds with cooking spray. Pour the concrete into the outer mold until it’s about 1/3 full. Press the inner mold into the center to displace concrete upward. Fill any gaps around the edges with more concrete. To create a drainage hole, insert a plastic straw or chopstick through the bottom after the concrete sets for 30 minutes. Wiggle it slightly to keep the hole open.
Step 4: Cure and Remove Molds
Let the concrete set for 24–48 hours, keeping it covered with plastic to slow drying and prevent cracking. Then carefully remove the molds—they should peel away easily. If the surface feels rough, lightly sand with fine‑grit sandpaper. Allow the planter to cure for another week in a dry place before planting.
Step 5: Seal (Optional)
Concrete is porous, so it may absorb moisture and develop a patina over time. If you prefer to prevent mineral stains, seal the inside with a concrete sealer or a coat of acrylic. For a natural look, you can leave it unsealed; just soak the planter in water for a day before planting to reduce alkalinity.
Creative Variations
- Add color: Mix concrete pigment into the dry mix before adding water.
- Embed stones or shells: Press them into the wet concrete surface.
- Use unusual molds: Try cardboard boxes, plastic bowls, or even old shoes for quirky shapes.
Conclusion
DIY concrete planters let you create custom containers that perfectly fit your style. Experiment with shapes, colors, and sizes—each one will be uniquely yours.