This makes a quite attractive plant. But, the stem of it is a little flimsy. You can change that by buttonholing over it.
You probably ended the weaving at the top of the plant. Now you wrap the working thread around the stem like you would do wrapped zigzag stitch.
Next, start working buttonhole stitches over the stem. Make sure the buttonhole stitches point to the outside of the zigzac.
When you arrive at the leaf, take to the needle to the other side of it so you can again work the buttonhole stitches to the outside.