Welcome to NGA. Some plants like hydrangeas can encroach into direct sun afternoon hours during the summer but only if summers are not harsh. Exactly how much afternoon sun would require testing though, like growing them now still in the plastic pots so you can easily move the pot around if the first spot has too much sun. Then plant in the fall. Because no two summers are alike, you may still find a future summers where things are too harsh and could end up having to use umbrellas, outside chairs, sheets, 35% shade cloth to suddenly provide supplemental shade. Your worst summer was in 1988 when temperatures reached 105F. If the plant blooms in the summer, the blooms may brown out if the environmental conditions are not favorable.
