Most full-service nurseries and garden stores offer plants that are adapted to our climate, including these last two factors. Other stores that offer plants only during a limited planting season sometimes have plants which are not adapted. For example, plants which are not adapted to our acid soils. Drought tolerance is something we are still learning about. As our climate becomes dryer, we will find out which plants we have used for years are adapted without regular irrigation.
In our climate we should be planting evergreen shrubs that do not lose their leaves in the wintertime. Why plant something which is bare of leaves for half the year?
I have written repeatedly about the importance of selecting plants that fit the physical location where they are planted. Even professionals make the mistake of planting plants that look very nice when planted but soon grow into each other and extend above and beyond the space where they were planted. Take the time to get the tape measure out and measure the spaces where you want to install plants. This should also include the height of windows you do not want to block with growth. Then check plant labels for the mature size. The mature size is listed as the expected size after 10 years of growth. Some plants outgrow this size, especially in the Pacific Northwest.
Sun and shade tolerance are also important. Most sun-loving plants will do fine with half a day of shade. Shade-loving plants will often grow fine with east sun exposure, but will burn with south or west exposure for even part of the day.