It really depends on what types of onions, but yes all onions can grow well in greenhouses. Some onions require certain periods of cold so the greenhouse would have to allow for that (shallots, garlic, and potato onions are all examples).
5.27hr
Hydrangea require full sun or a good part of the day in the sun.
Lots
The polar regions never receive any direct sunlight.
Most deserts receive much solar radiation - sunlight.
It does get sun but not as much as mercury and Venus
alot of sun light a year
Pothos plants thrive in bright, indirect sunlight but can also tolerate low light conditions. They should be placed in a location where they receive about 4-6 hours of sunlight per day for optimal growth.
alot of sun light a year
none
Most deserts receive 300 or more days of sunlight per year.
A wandering jew plant needs bright, indirect sunlight to thrive. It should be placed in a location where it can receive about 4-6 hours of sunlight per day. Avoid direct sunlight as it can scorch the leaves.