Having little or no precipitation
It is true that one season of the series, that of 1887, was hot and droughty, but the following summer was exceedingly wet.
The climate is temperate and the rainfall usually adequate, but one year in five is expected to be droughty.
Mere making up of necessary water in droughty seasons is one thing, protection against frost is another, while the addition of soil material is a third.
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