To add a large group of plants to a palette in one shot, follow these steps.
First, go to the plant search page. In the top section of the left sidebar, select the palette you want to add plants to.
Now you can use the filters, type in plant names, and run searches find the perfect plants for your palette.
Once you have a group of plants that you want to add, click the “Add Current Results” button in the left sidebar to add all the plants.