An herb spiral works with microclimates to provide uniquely suitable conditions for carefully selected plants. Plants that require the most drainage and heat are placed near the top and on the south-facing sides of the spiral, which have the warmest exposure. Plants requiring more moisture, shade or shelter - such as dill, chives and chervil - are placed lower on the structure. The water that drains from the soil higher on the structure accumulates in these lower areas, and the differences in grade allow for shelter from wind and excessive sunlight.
Ideally, the spiral garden is built with stone or brick, which have a high heat capacity: These materials absorb solar energy during the day and release it in the form of heat at night. This is helpful for plants that fare well in a hot and dry microclimate, such as rosemary, lavender and tarragon.
BILDAGENTUR ZOONAR GMBH/SHUTTERSTOCK
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