Two display cakes decorated with sugar flowers
Two display cakes decorated with sugar flowers

How to Decorate a Dummy Cake with Sugar Flowers


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Image of a styrofoam cake decorated with red rose sugar flowers and gold leaves and a cake topper that says love with the text “decorating styrofoam cakes”

How to Decorate A Dummy Cake With Sugar Flowers: Is this the easiest method ever?!

I mean, obviously, I’m gonna say: Yes! This is hands-down the fastest, easiest (and most fun!) way to decorate dummy cakes. (aka styrofoam cakes, faux cakes, fake cakes, or display cakes… many names, same concept 😉)

Sugar Flowers by Kelsie Cakes in-studio headshots

Hi! In case we’ve not yet met, I’m Kelsie Delisle, a cake decorator turned Sugar Flower Artist. I’ve been creating and selling Sugar Flowers online since 2015 — so I know what to do to provide the reliable, on-time, and sturdy flowers you need for your elegantly decorated cakes.

I also know what to do to make decorating those display cakes way easier.


Lots of trial and error.

And also…

Use These Supplies For Your Dummy Cake Design!

The drill
The drill bit
The smoothie straws
The styrofoam cake

Prefer to watch? Here’s the YouTube Video on how to decorate a dummy cake

The Struggle Bus of Styrofoam

I used to really struggle with sticking floral wires into styrofoam cakes. Real cakes have a lot more give to them, so they’re so much easier to decorate with florals.

The problem with the foam cakes is two-fold.

One, if you try to insert the flowers right after you cover them in fondant or icing, the icing is still soft. So when you man-handle the cake (which, tbh, you have to do when you’re trying to insert something into styrofoam) you’re going to mess up the icing.

…Or get fingerprints all up in your smooth fondant.

And two, if you wait a few days for the icing/fondant to dry, then it’s really hard to put the wire stems into the foam! There’s this thick, dry, sugar barrier between your flower and the cake!

Image of a woman holding her hand on her head looking at a iPad and looking stressed
How styrofoam cakes used to make me feel 🤯

Finally, I found a solution. It’s a little messy, but in the long run, you'll save a ton of time.

How to Decorate a Dummy Cake with Sugar Flowers Sugar Flowers by Kelsie Cakes

The Easy Method to Decorate Styrofoam Dummy Cakes

cake sketch on ipad procreate

This does require you to plan out a bit in advance how you want your cake decorated.

What really helps me envision my cake ahead of time is by sketching up a drawing on Procreate to get my ideas out of my head and onto paper (or an iPad screen lol).

Before we decorate our dummy cakes, we'll do…

The Prep Work

This is a trick I learned from Maggie Austin: preassemble little bouquets of flowers before you start putting them onto the cake. I find that the smaller flowers and leaves are more less to break when adding them in a group to the arrangements.

By creating bigger groupings, the flowers feel more stable (and safer) when inserted into the cake. The smaller leaves and blossoms really do make or break (no pun intended) a design!

Even though this step is a little time-consuming upfront, when you make the boutonnières ahead of time, it's so much faster to style the cake. And you can be sure you’ve got the filler you need to cover any gaps. (bonus → it’s easier to hide a broken petal or two!)

Protip! → The key is to make sure that the main stem of your little bouquets is not more than .5” in diameter, so it fits into your smoothie straw.

when learning how to decorate a dummy cake with sugar flowers, make sure your flowers are prepped first like this gardenia with leaves wired together

Your Next Steps

So far, you've sketched out your design and created some little bouquets to put into the cake. Now is the time to get messy!

(I said it would be fun, remember?! 😋)

I recommend drilling all of the holes first because the flying styrofoam bits make a huge mess. Pro tip: be sure you have a trash can and a broom (or vacuum) nearby.

Be sure to angle your holes toward the middle of your dummy cakes. This way the cake will be the most stable. If you have too many straws stuck right into the edge of the cake, they might compromise the structural integrity! (or so my professional engineer husband tells me… also I can say with 100% certainty that this holds true for real cakes!!!)

After I drill the holes, I knock out as much of the excess styrofoam bits as I can over the trashcan. Next up: inserting the smoothie straw. I cut the straws to the depth of the hole, or just a little bit shorter. Especially if I'm using a bright-colored straw, cutting it shorter helps the straw not show in the final design.

The smoothie straws might seem like an unnecessary extra step… But trust me, they help! The straws keep the little foam bits from getting in your way as you decorate your dummy cakes.

Image of a woman’s hand placing a sugar flower rose onto a white wedding cake

The Grand Finale

And then… add those flower bouquets!

This blog talks about one of my favorite methods for styling a cascade of flowers!

I frequently re-style and redesign my display cakes to show off new Sugar Flower designs. This technique also makes it very easy to redo the flowers during my mini photoshoots. I just pull the little bouquets out of the straws and slide in a new one!

How to Decorate a Dummy Cake with Sugar Flowers Sugar Flowers by Kelsie Cakes

Some of the links on this page are affiliate links. That means I get a small commission if you purchase through this link. However, I make it a point to only share tools and resources I truly love and use. 

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