Reflectivity is an often ignored subject, but can be very useful for people growing indoors in windowsill and under lights. You can massively increase the light hitting plants by placing reflective material under and around them... something to think about when starting seedlings under shoplights.
Clean mylar has a reflectivity of around 95% (less with waterspots). Flat white paint or plastic sheeting has a reflectivity of around 90%. Aluminum foil reflects about 70% of the light hitting it.
Our garden area is along the side of the light colored (off white) house and if the mature plants are up against the wall they don't get any reflected light on the back side, so it is better to plant them several feet out from the wall.
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