What requirements must be met in order for in order to for a plant to grow on or in a specific substrate?
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1) sunlight
2) water
3) soil
Plants used for facade greening may be grown in soil in the ground, or in containers filled with a well-designed growing medium. The principles outlined in growing substrates for green roofs is relevant to green facades and is outlined here.
The use of planter boxes, mounted at varying heights above the ground, can allow greater coverage of the facade, where the building is so tall that ground level plants will not reach the top. The advantage of in-ground planting, where soil is of a reasonable quality, is that the plants will have more access to water (the soil will not dry out as quickly as in a container) and will have more space for their root systems to grow.
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