Learn which plants thrive in your Hardiness Zone with our new interactive map!

How to Make Mold for a Concrete Rhubarb Leaf

By Jennifer Loucks
Large rhubarb leaves make a good leaf casting.
rhubarb. image by Lena Lir from Fotolia.com

Success at making a leaf casting from a large rhubarb leaf starts with assembling the mold. The mold consists of sand in a large container, making it simple to readjust the mold for multiple leaf castings of different sizes and shapes. Placing plastic wrap over the sand allows you to mold the sand. A finished leaf casting works well as a birdbath, bird feeder or garden stone.

Fill a 2 by 4-foot container with 4 inches of sand. Large cement mixing containers work well for making leaf molds.

Form a sand mound in the middle of the container so the rhubarb leaf lies naturally in the sand. Make sure the sand is at least 2 inches deep around the edge of the sand mold.

Cover the surface of the sand and mound with plastic wrap to prevent the concrete from getting sand in the grooves.

Choose a rhubarb leaf that has a minimum 2-inch stem and no tears or holes. Place the leaf on the mound and adjust the sand, if needed. Place the center of the rhubarb leaf over the highest part of the sand mound.

Spray cooking spray over the rhubarb leaf after placing it on top of the plastic wrap sand. This will make it easier to remove the leaf after applying concrete.

Apply concrete over top of the sprayed leaf. Taper the thickness by making the center 3/4 inch thick and the edges 1/4 inch thick. Let the concrete dry for 48 hours before removing from the mold.

Remove the leaf casting from the mold and remove all leaf particles. Cure the casting for seven days by letting it rest in a protected area. Seal the surface of the casting with concrete sealer before using it outdoors.


Things You Will Need

  • Concrete mixing container
  • Sand
  • Plastic wrap
  • Cooking spray
  • Concrete sealer

About the Author


Jennifer Loucks has been writing since 1998. She previously worked as a technical writer for a software development company, creating software documentation, help documents and training curriculum. She now writes hobby-based articles on cooking, gardening, sewing and running. Loucks also trains for full marathons, half-marathons and shorter distance running. She holds a Bachelor of Science in animal science and business from University of Wisconsin-River Falls.