Mosaic Garden Rocks: How To Make Garden Mosaics

Make mosaic garden rocks to add a pop of color to the garden. We’ll show you how to glue the tiles and mix the grout. A great DIY mosaic project for anyone!

Hi Kenarry Readers! We’re Jennifer and Kitty from RunningWithSisters.com, and with spring in the air we are ready to craft outside! We love garden crafts, and one of our favorite projects for the garden is doing mosaics. So we made these mosaic garden rocks to add a little extra pop of color to garden!

Even if you’ve never done a mosaic project before, you can make these easy mosaic rocks! There’s no wrong way to do them! We’ll show you how to glue on your tiles – and just about any tiles will work. Then we’ll show you how to mix the grout, tint the grout, apply the grout, and buff it. We’ll even seal the mosaic so it will repel water in the garden.

How To Make Mosaic Garden Rocks

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Materials (For One Rock)

• 1 rock, 4” to 5”
• Colorful tiles
• White sanded grout
• Clear silicone adhesive
• Mosaic grout sealer
• Black acrylic craft paint

Other Supplies

• Plastic disposable mixing container (like a cottage cheese container)
• Wooden stirring stick or putty knife
• Gloves
• Sponge
• Plastic cup for water
• Measuring spoon
• Paper towels

Steps
1. Pick Out Your Tiles
Set out your tiles so you can see them all at once. We used dots, squares, and mirror tiles in sizes ranging from 1/4” to 1”. We decided to make three rocks spanning the spectrum, so we did one in blues and purples, one in greens and aquas, and one in yellows, oranges, and reds. This is where you get to make your own creative decisions. You can make your rock with any colors you like! One rock with the whole rainbow, seven rocks each a color from ROYGBIV, it’s up to you!

2. Glue On The Tiles
Glue the tiles to the rock using the clear silicone adhesive. You don’t need a lot of the glue. Just place a dab on the back of each tile and press it onto the rock. Each tile has a top and bottom. Usually the bottom is rougher. This allows the glue to grab the tile better. Be sure to glue the tiles onto the rocks with the rough or bottom side down.

The grout we used spans a width of 1/8th inch to 1/2 inch, so we made sure to place our tiles that close together. If you have big spaces between the tiles, the grout might crack. Plus these mosaic rocks are all about the pretty tiles! Not big areas of grout.

Cover all the surfaces of your rock with tiles except for the bottom where the rock will sit on the ground. Let the glue dry.

3. Mix The Grout
Put on your gloves. Read the instructions on your package of grout to see what ratio of water to grout you will need. Our grout calls for 1 part water to 7 parts grout. For these small rocks, we only need a little grout, so we used 1 tablespoon of water and 7 tablespoons of grout. (You will only have 15 minutes to apply the grout after it is mixed, so it is better to mix small batches as needed.)

Here’s a video we made showing how to mix and tint the grout:

Start by adding 1 tablespoon of water to your disposable container. Then add 7 tablespoons of grout. Mix thoroughly. The grout should be the texture of natural peanut butter. Add more water, a little at a time, if necessary until the grout is pasty but not runny.

4. Tint The Grout
For this project we chose to tint the grout gray to make the color of the tiles pop. To tint the grout, squeeze a small amount of acrylic craft paint into the grout. Mix thoroughly. Keep in mind you only have about 15 minutes to work with the mixed grout including applying it, so don’t take too long with this part. See if you like the color, if not add more paint and stir. The grout will look darker when wet and will dry a little lighter.

5. Apply The Grout
To grout your rock mosaic, smear the grout right over the tiles. Press it into all the spaces between the tiles. Make sure you get some grout around every side of every tile. Then wipe the excess grout off with a damp sponge.

There will be a small amount of grout left on top of the tiles, but that’s okay. Let the grout dry for 30 minutes, then buff the haze off the tiles with a damp paper towel. Let the grout dry completely over night. (If a haze forms again, just buff the tiles again.)

6. Seal The Mosaic Rock
Shake the grout sealer. Apply it all over the mosaic rock in a thin coat using a sponge paintbrush. Don’t worry. It will dry clear!

When your rock is all dry, give it a new home in the garden. These mosaic rocks add such a playful touch to the yard, you’ll want to make a whole bunch! Set them in and around greenery for little bursts of color. Or create a whimsical rock border for your favorite flowerbed. So pretty! Or, a small version of these rocks would be such a great whimsical element in your fairy garden.

Looking for more garden crafts to do with the kids? Check out this fun Wind Chime Made with Repurposed Old Keys.

If you have any questions at all while you’re working on your mosaic rocks, just leave us a comment and we’ll reply. We are always here to help. And even if you don’t have a question, we’d love to hear from you! Have you ever done mosaics for your garden? What was favorite project? Please share in the comments!
Happy Crafting,
Jennifer & Kitty

If you’d like to share this idea, you can pin this photo:

Here are a few more garden projects from The O’Neil Sisters:

Mosaic Birdhouse

Steampunk Stepping Stones

Seashells Balls

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Jennifer and Kitty O’Neil are sisters and authors of several books including Steampunk Chic: Vintage Flair From Recycled Finds. Their crafting, decorating, and flea market articles have appeared in Woman’s World, Craft Ideas, and Create and Decorate magazines and on the web sites of Better Homes and Gardens, Family Circle, and HGTV. Their detailed craft videos can be found on Curious.com and YouTube. The O’Neil Sisters share their enthusiasm and their fresh approach to crafting and decorating on their blog, RunningWithSisters.com.

Follow the O’Neil Sisters on Facebook, Twitter, Pinterest and Instagram.

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