Depends on the plant What is right for one plant may cook another plant to death. Conversely, a plant may thrive in shade and another will grow spindly and never bloom. Also it depends on your...
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Yes they do their leaves provide sunlight into nutrions
It depends on the plant. Some like full sun, some like partial sun and some like shade.
Violets don't like direct sunlight, they will receive burnt patches. Keep violets damp to a little on the dry side (not bone dry though)