On the first window after double-clicking on your plant, click the upper left-most waterlily to bring up the next gump. Left click the X on the upper right. Then you will get a choice of the check mark to set your plant into deco mode, or X to cancel out of the option. This is for 2D client. In KR client, click on the plant, and then the Reproduction button. On the next page, there are 2 little green plants on the far right side. Click there to get option for Decorative Mode choices of Okay, or Cancel.