Light Exposure
The recommended light exposure should be used as a general guideline given that many plants can tolerate varying degrees of light intensity or shade, especially when combined with differing climates and soil moisture.

Sun: Full exposure to the sun throughout the day.
Partial Shade: Partial exposure to the sun; shade or filtered light for half day or at least 3 hours during the hottest part of the day. (Sunset Western Garden Book)
Light Shade: Filtered or dappled shade where patterns of shade and sunlight shift during the day.
Shade: Full shade for all or most of the day; no direct sun exposure.

Water Requirements
The suggested water requirements are broad and general guidelines for established plants in warm temperature conditions.  Other environmental factors such as wind, soil type, precipitation and topography may affect the plant’s water requirements.  (Most plants will require regular moisture for a time after transplanting.)

Rarely: After established, little or no supplemental irrigation needed
Infrequent: Approximately 4 week intervals.
Occasional: Approximately 2 week intervals
Moderate: Approximately every week.
Regular: Approximately twice a week.
Ample: Almost daily. (Bog, aquatic, or streambed plants)

USDA Zones: Plant hardiness zones based on annual winter minimum temperatures.

SUNSET Zones: Climate zones based upon temperatures, latitude, elevation, ocean influence, continental air influence, mountains and hills, microclimates, and growing season (the average number of days between the last frost in spring and the first frost in fall).

Evergreen: A plant which retains its leaves in a living state all year.
Semi-deciduous: Refers to plants that may shed all or some of their leaves to avoid adverse weather conditions such as temperature or drought.
Deciduous: A plant having leaves that fall off or are shed annually.
Drought deciduous: A plant that may drop its leaves during periods of drought.
Dormancy period