How to Make Cement Flower Pots | DIY Planters That Last

Making cement flower pots requires Portland cement, water, a two-mold system, and 24–48 hours of curing time for planters that resist cracking and weather well.

Store-bought concrete planters cost plenty, but a bag of cement runs about eight bucks and yields several pots. The process is straightforward — mix cement to a thick, peanut butter-like consistency, pour it between an outer mold and a smaller inner mold, let it cure, then pop the forms off. , with the common pitfalls explained so you avoid them.

What You Need for Cement Flower Pots

The materials are cheap and most are already in your kitchen or garage. Cement choice matters: straight Portland cement makes dense, smooth pots, while a standard concrete mix (cement plus sand and aggregate) gives a rougher texture but uses less pure cement. Either works.

Any two rigid containers where one fits inside the other with a gap all around will work — plastic cups, paint cans, yogurt tubs, takeout containers, or cardboard boxes lined with a plastic bag. The outer container shapes the outside of the pot; the inner container, weighted or taped down, creates the hollow center.

Step-by-Step: Pouring and Curing

Tape over any holes in the outer mold first, then lubricate both molds with cooking oil. Sift the dry cement through a strainer into a bucket to remove lumps. Add water slowly — — and mix to a thick, creamy soup that holds its shape when scooped. Pour the mix into the outer mold until it is about two-thirds full.

Press the inner mold down into the center, stopping at least an inch from the bottom of the outer mold. The gap becomes your pot’s base thickness. If the inner mold floats up, set small stones or water inside it, or tape a stick across the top of the outer mold to hold it down. Fill the sides with more cement, tap the mold on the counter to release air bubbles, smooth the top with a spatula or your finger (gloves on), and let it sit on a level surface out of direct sun for 24 hours.

After one full day, gently pull the molds apart — twist rather than yank. Sand the rough edges with medium-grit paper. Wait at least another day before drilling drainage holes; early drilling risks cracking. Use a masonry bit at low speed, and wear your mask. The finished pot can be used as-is or sealed with a concrete sealer for frost resistance.

The Fabric Method for Organic Shapes

For curved, draped pots rather than straight-sided ones, soak an old towel or piece of fabric in cement mixed to a thick mud consistency, then drape it over an upside-down bowl or form wrapped in a plastic bag. Smooth the fabric with gloved hands, tuck the edges, and let it cure for 24 to 48 hours — or up to a week for thicker fabric. Remove the form once the cement feels hard, then drill drainage holes. The result looks like a stone bowl with soft, folded edges.

FAQs

How long before I can plant in a cement pot?
Wait a full week after curing before planting. Cement continues to harden and can burn plant roots if they go in too soon. Curing for 7 days in a cool, damp spot gives the strongest result.

Why did my pot crack?
Cracks happen when cement is too wet, when the inner mold shifts during drying, or when you remove the molds or drill holes before the cement fully sets. Always wait 48 hours minimum before drilling, and keep the pot out of direct sun while curing.

Can I color the cement?
Yes — add dry concrete pigment powder to the mix before adding water. Start with a small amount (about 2–3 percent of the cement weight) and test on a scrap pour.

Need to choose the right materials for your next project? Check our tested recommendations for the best cement flower pot supplies that save trial and error.