Creating Large Concrete Planters: A Comprehensive Guide
Transform your outdoor space with stylish and durable large concrete planters. Not only do they add a touch of industrial charm, but they're also perfect for growing large plants, trees, or creating a stunning water feature. Here's a step-by-step guide to help you create your own large concrete planters, no professional experience required.
Materials Needed
- Concrete mix (quick-setting is recommended)
- Large plastic containers or molds
- Water
- Concrete reinforcing fiber (optional, but recommended)
- Concrete sealant
- Trowel or shovel
- Gloved hands or a mixing paddle (for mixing concrete)
- Bucket (for mixing concrete)
- Safety gear: gloves, safety glasses, and a dust mask
Choosing the Right Mold
Selecting the right mold is crucial for creating the desired shape and size of your planter. You can use large plastic containers, or create your own mold using plywood and screws. Ensure the mold is watertight and has a flat base for stability.
Mixing the Concrete
Follow the manufacturer's instructions to mix the concrete. Typically, you'll need to combine one part water with six parts concrete mix. Add concrete reinforcing fiber during this step for added strength and durability. Mix the ingredients thoroughly until the consistency resembles thick cake batter.

Pouring the Concrete
Pour the mixed concrete into your mold, filling it about 3/4 full. Leave some space for the weight of the soil and plants. Use a trowel or shovel to smooth the top and remove any air bubbles. If desired, create drainage holes using a drill or a sharp object before the concrete sets.
Curing the Concrete
Cover the mold with a plastic sheet to prevent the concrete from drying too quickly. Allow the concrete to cure for at least 24 hours before removing it from the mold. For optimal strength, let it cure for 7 days before using it.
Finishing Touches
Once the concrete is fully cured, remove it from the mold. Clean any excess concrete from the surface using a wire brush or a damp cloth. Apply a concrete sealant to protect the planter from moisture and stains. Allow the sealant to dry completely before filling it with soil and plants.

Caring for Your Concrete Planter
| Season | Care Tips |
|---|---|
| Spring | Fill the planter with well-draining soil and plant your desired plants or trees. Water regularly, ensuring the soil remains moist but not waterlogged. |
| Summer | Monitor the plants for signs of stress, such as wilting or yellowing leaves. Water more frequently during hot, dry spells. |
| Fall | Prepare the planter for winter by removing dead leaves and debris. If necessary, cover the planter with a protective layer, such as burlap or a plastic sheet. |
| Winter | Keep the planter free of snow and ice to prevent cracking. If the planter is empty, fill it with water to prevent frost heaving. |
By following these steps and providing proper care, your large concrete planters will last for years, adding beauty and functionality to your outdoor space.