How to Make a DIY Witch Cauldron for Halloween: Glowing Coals, Mist and Bubbles
A DIY witch cauldron is built from a black planter or plastic cauldron, aged with paint, then set on a ring of spray-foam “coals” lit by orange string lights. For motion, add a mister in a bowl of water for rising mist, or a fog and bubble machine for bubbles that burst into smoke. Both builds below use ordinary craft and hardware supplies.
A cauldron is the easiest way to anchor a witch scene, and you can build one from a black planter, some orange string lights and a tub of foam. The two tutorials we found take different routes: one gives you a still, glowing fire with mist, the other a bubbling pot. If you want the whole setup around it, see our witch cauldron scene guide.
What do you need for a DIY witch cauldron?
| Item | Used for | Which build |
|---|---|---|
| Round black planter or a plastic cauldron | The pot itself | Within the Grove uses a planter; The Navage Patch uses a plastic cauldron |
| Textured black spray paint, Mod Podge, dirt, dried leaves, gold acrylic paint | Aged, grimy, rusty finish | Mist build |
| Orange string lights | The glowing coals | Both |
| Spray foam insulation | Shaping the coals or faux fire | Both |
| Orange, red and black spray paint, gray acrylic | Painting the coals | Both (the Navage Patch uses flat black then glossy red) |
| Mist maker and a bowl of water | Rising mist from the cauldron | Mist build |
| Fog and bubble machine, fog juice, concentrated bubble liquid | Smoke-filled bubbles | Bubble build |
| Green outdoor lights, utility knife | Green glow inside, cutting a hole in the back | Bubble build |
Neither source lists quantities or a total cost. The Navage Patch notes the fog and bubble machine is the expensive part and says there is no cheaper substitute.
How do you make the mist cauldron with glowing coals?
This build follows Liz of Within the Grove, who published it on September 9, 2026.
- Prep the pot. Spray the planter with textured black spray paint, even if it is already black.
- Make the grime. Mix Mod Podge and dirt into a paste and brush it around the top and sides. Press crushed leaves or flowers into it while wet.
- Repaint and rust. When dry, give it another coat of textured black, then dry-brush gold acrylic around the rim and randomly on the sides.
- Lay out the coals. Wrap the pot in plastic, set it on cardboard and arrange the orange string lights around the base. Keep the battery pack out of the foam.
- Foam the coals. Zig-zag spray foam around the lights, covering them but leaving enough that light shines through.
- Paint the coals. Once the foam dries, remove the pot and paint the foam orange, red and black, then add gray acrylic for a charred look.
- Add the mist. Trim the cardboard so only the coal base remains, set the pot back in the center and nestle a mister in a bowl of water inside it. If the mist does not clear the rim, raise the bowl on something inside the pot.
How do you make a bubbling smoke cauldron?
This build follows Greg of The Navage Patch, who published it in October 2023 and updated it in 2024.
- Make the fire. Arrange small birch logs or branches around a wire wreath form and spray enough foam to hold them. Wrap orange battery LED lights around it before the foam sets, then add more foam over the lights.
- Paint it. The next day, paint the foam flat black and then glossy red.
- Cut the cauldron. Cut a square hole in the back of a plastic cauldron with a utility knife so fog and bubbles can get in.
- Load the machine. Fill the fog and bubble machine with fog juice and diluted concentrated bubble liquid, then run a test.
- Light it. Place green outdoor lights inside the cauldron. The author says any green outdoor lights will work.
- Secure the witch. If you add a witch figure, push a narrow trellis into the ground and zip-tie her to it so she does not spin in the wind.
What tips make the cauldron look better?
- Use real dirt. Within the Grove suggests dirt straight from your yard for the grime texture.
- Add a second mister. Two misters make denser mist, according to Within the Grove.
- Raise the bowl. Lifting the bowl inside the pot helps mist clear the rim.
- Dilute concentrated bubble liquid. The Navage Patch says it makes much better bubbles than small bubble-wand bottles. The ratio varies by brand and the article gives none, so follow the label.
- Test before dark. Run the machine once before you set up the scene.
If you use fog juice, our guide to using a fog machine and our fog juice guide cover fluid and setup in detail.
Safety note: neither source gives safety guidance, so this is ours. Spray paint and foam need ventilation, so work outdoors or in an open garage. Keep battery packs and plugs dry and away from the mister or fog machine water, and follow the machine manual. Use a utility knife carefully on plastic, and keep real flames away from foam. Our guide to outdoor cord and power safety covers the electrical side.
Frequently Asked Questions
What can I use as a cauldron? Within the Grove uses a round black planter pot, and The Navage Patch uses a plastic cauldron. Pick something that already looks like a cauldron.
How do you make fake glowing coals? Arrange orange string lights around the base, cover them with zig-zag spray foam without hiding the glow, then paint the foam orange, red and black.
How do you get mist to come out of a cauldron? Within the Grove sets a mister in a bowl of water inside the pot. Use two for thicker mist and raise the bowl if the mist does not reach the rim.
How do you make bubbles that look like smoke? The Navage Patch uses a fog and bubble machine filled with fog juice and diluted concentrated bubble liquid, with a hole cut in the back of the cauldron.
Is there a cheaper way to make bubbles? The author says there is not one for this effect. The mist build is the lower-cost route.
Want the full scene? Build your witch scene next.
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