The Color Purple: A Garden Favorite
Green
Most leaves look green, but many are red, brown, purple, yellow, and orange! What's up with that !
Green
The green comes from the vast amount of the pigment chlorophyll (used in photosynthesis) inside the cells. From sunlight, it absorbs many wavelengths (think rainbow) except one - GREEN ! It reflects that wavelength and that is why we see leaves green!
The color spectrum
Orange and Red
Leaf color in plants is mostly about pigments and how they react to light. Carotene (orange and yellow crystals) inside the cell help it with its daily processes.
A full sun loving red leaf maple
Another sun lover Hens and Chicks !
The combinations of which substances present in the leaves and the quantities they are present in give us the wide range of colors and tones. All that green red, yellow and orange makes for a great color palette.
Fall leaves have lost their green chlorophyll and what you see are the orange pigments
Purple
There are also some that work as a sun block to protect the inside of the cells from the intense sun – these are called anthocyanins - and they are a a reddish to blueish purple.
Full sun loving purple leaf basil
The purple leaf coloration tends to be an adaptation to full sun. It is the plants way of staying in the sunny environment while protecting the delicate cells and chlorophyll inside from the harmful UV radiation.
The reddish sheath covering a new leaf in Ficus decora protects it from the UV light
Haven't you noticed a red leaf plant that is put into shade eventually all its leaves are green and it has lost the bright red and purples. That is because in a lower light situation the leaves don't need protection and thus the pigments are not produced.
A red maple placed in shade will quickly start to loose its color and turn green
Variegated
The lack of color in a leaf (variegation) simply means those cells have little to no chlorophyll (or none we can distinguish) and we see it white or pale yellow against the green.
Variegated leaves have little to no chlorophyll - most want to be in full sun
Dark pink variegation is rare
Pink coloration in the tips of newly growing leaves protects them from the UV radiation
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Article written by our Staff Horticulturist, Peter B Morris, BSc, MSc, MBA
All photographs used with permission from @SHUTTERSTOCK