DIY Large Cement Planters: How to Make Bold, Durable Outdoor Statement Pieces

If you want to make a big impact in your garden, DIY large cement planters are the perfect project. These oversized planters are strong, weather-resistant, and ideal for anchoring outdoor spaces like patios, entryways, decks, and garden corners. Best of all, making them yourself costs far less than buying large concrete planters from a store.

With the right molds and techniques, even beginners can create professional-looking results.

Why Choose Large Cement Planters?

Large cement planters are:

Extremely durable and long-lasting
Perfect for outdoor use year-round
Ideal for shrubs, small trees, and grasses
Modern, rustic, or minimalist in style
Much cheaper to DIY than to buy

They also provide stability, making them great for windy areas.

Supplies You’ll Need

Cement or concrete mix (quick-set or standard)
Large planter molds or containers
Smaller inner container (to create planting space)
Mixing tub or bucket
Water
Trowel or stir stick
Cooking spray or mold release
Gloves and mask (recommended)
Sandpaper or concrete stone
Optional: concrete pigment, sealant, rebar or wire mesh

Best Mold Ideas for Large Cement Planters

You can use:

Large plastic storage bins
Buckets, trash cans, or totes
Cement mixing tubs
Two containers (one large, one smaller)
Custom wooden molds (for square or modern styles)

Tip: Thicker walls (at least 1.5–2 inches) prevent cracking in large planters.

How to Make DIY Large Cement Planters

Step 1: Prepare the Mold

Spray the inside of the large mold and the outside of the inner mold with cooking spray or mold release.

Step 2: Mix the Cement

Mix cement with water until thick and workable—not runny. Large planters need a sturdier mix.

Step 3: Pour the Base

Pour cement into the mold to create the bottom layer (2–3 inches thick).

Step 4: Add Drainage

Insert a straw or PVC pipe section in the base to create a drainage hole.

Step 5: Insert the Inner Mold

Place the smaller container inside, centering it carefully. Weigh it down with bricks or stones.

Step 6: Fill the Sides

Pour cement around the sides, packing firmly and tapping the mold to remove air bubbles.

Step 7: Cure Slowly

Let cure for 48–72 hours. Large planters need extra curing time for strength.

Step 8: Demold Carefully

Remove molds slowly and allow the planter to fully cure for several days before planting.

Reinforcement Tips for Extra-Large Planters

Add wire mesh or hardware cloth
Use rebar for tall planters
Avoid thin edges
Keep planter evenly thick

Reinforcement helps prevent cracks over time.

Finishing & Styling Ideas

Leave natural gray for a modern look
Stain or paint with exterior masonry paint
Add texture using sponges or fabric
Seal for moisture and freeze protection
Elevate with pot feet for drainage

Best Plants for Large Cement Planters

Small trees (olive, citrus, ficus)
Shrubs (boxwood, hydrangea)
Ornamental grasses
Tall flowers and mixed arrangements
Evergreen plants

Large planters allow deeper root systems and better plant health.

Care & Outdoor Maintenance Tips

Seal planters annually
Elevate slightly off the ground
Avoid freeze–thaw stress in winter
Move planters before planting if needed (they get heavy!)

Final Thoughts

DIY large cement planters are perfect for gardeners who want bold, long-lasting outdoor décor. With minimal materials and a little patience, you can create oversized planters that look high-end, withstand the elements, and become stunning focal points in your space.

Big planters. Big style. Built to last 🪴🧱✨