Check the hole again about 10 hours later. If any water remains in the hole, you must take steps to improve the drainage. You can improve drainage by raising the planting level or by installing a special drainage system for the planting area. Poor drainage and soggy soils are not ideal growing conditions. Comments on soil requirements or tolerances have been made for many of the plants in the selection guide.
Some plants require full sun all day.
Others may need part shade, usually in the hot afternoon. Still others grow better in filtered shade of tree canopies. It is important that you know the light conditions of the different areas where you will be placing plants. Choose plants that grow well in those light conditions. It is frustrating to purchase a plant, put it into the landscape, and watch it die because it received too much sun.