How do you attach real succulents to a cake?

Here’s how to do it:

1. Trim down the root of the succulent.
2. Fit the succulent snugly in the test tube. Use gentle pressure to insert the test tube into the top of your cake.
3. Stagger other succulents in the other layers of the cake, and repeat step 2.
4. For the blossoms, first add some water to the test tubes.

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In this manner, what piping tips to use for succulents?

Additionally, how do you pipe a cactus on a cake?