Some Miscellaneous Factors that Affect Plants and Sun Intensity
Variegated Plants - Plants with variegated foliage will always need less sun that the same species with green leaves. So variegated plants will do best in part sun, dappled, or full shade.
Hot Summer Weather - When day temperatures begin to regularly exceed 90◦F, many plants will benefit from afternoon shade.
New Homes - In new housing developments, sunlight conditions will change over time as trees mature. What was once a sunny spot may gradually change to part or full shade conditions. So plant for current sunlight conditions and understand that in five or more years, you may need to change out your plants as conditions become more shady.
Sunny Winters in Cold Areas of The West - During winter, the sun is lower in the sky, and the angle of the sunlight shifts. This can change a sunny location into a shady location. This is an important consideration for broadleaf evergreen plants in cold climates. Too much sun during Western winters can result in burned foliage. High-intensity sunshine combined with frozen soil prevents the foliage from transpiring (losing moisture through the leaves to cool the plant). So be sure to plant your broadleaf evergreens and evergreen perennials, such as Helianthemum (Rock Rose), in a spot where they are more shaded during the winter.