Answer: Most plants resent a truly windy location, and many will not thrive at all in a windy location. This is why farmers and gardeners long ago realized the importance of wind breaks.
In my experience, stewartias do best in a sheltered location where the soil is humusy, rich, evenly moist and acidic. It may need to be watered in August if the summer is a dry one. A little shade at midday in midsummer can also be helpful, in part because this will help maintain soil moisture and reduce heat stress. It might help to think of this as an "edge of the woods" tree with an eastern exposure being preferred. This tree is so special that it deserves a location where it can be enjoyed up close, such as near a patio as a specimen, and its attributes are a bit lost when used as a lawn tree.
The Nootka Falsecypress (Chamaecyparis nootkatensis)is native to areas with cool summer temperatures. It prefers a humid climate and ample soil moisture. Placing it in an exposed location with excessive summer heat and/or drying wind can cause it to suffer as well. I'm sorry I can't be more encouraging.
You might want to carefully evaluate the growing conditions you have to offer and then identify plants that can thrive in your location prior to purchasing. Your county extension and local nurseries might be able to help you identify plants that appeal to you and are well suited to your microclimate.
Q&A Library Searching Tips