Overhead spraying uses up more water than ground level watering due to
evaporative loss. With frequent use it can also encourage fungi by leaving
the leaves wet, raising humidity and bringing up spores from the ground if it
squirts that far.
However some types of plants will do much better with raised humidity and the
coolness produced by the evaporative loss - provided you can afford the water
and other possible consequences.
I know of a rainforest maintained in a gully by spraying at intervals round
the clock in a climate that gets about 25 in per year of rain and would never
support such a thing naturally.
You have to decide on how much you want to grow according to your climate and
how much you want to create a microclimate.
Should I have the water
Drippers or "leaky" hoses will do this and conserve water too.
I would like it all to come
Cannot comment due to lack of experience with gardens freezing.
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