Green roofs are a living thing and need care throughout their life. With proper care a green roof will thrive.
In dry climates install a drip irrigation system, or rely on rainwater for low-maintenance roofs in temperate areas. Keep an eye on it so you can see how the sedum is faring; do a little weeding and take out the grasses.
Water newly planted roofs regularly during the establishment phase but make sure the sedum is not sitting in water. While they typically don’t require much maintenance, green roofs and sedum plants like a fertiliser. However, use the right mix and formula. A good sedum fertiliser should be a slow-release organic feed formulated specifically for healthy and robust flowers.
Green roof plants only have a shallow layer of growing medium, so it is imperative that there is a robust, healthy plant layer. They do not have the same access to water and nutrients as those at ground level, so the plants need to be well-nourished to withstand summertime droughts and winter frosts. Ideally, apply in early spring and again in early summer. Periodically remove any weeds and inspect the roof twice a year. Monitor plant health, coverage, and root development, especially in the first growing season. Quickly address any drainage problems, leaks, or plant die-offs. Building a small-scale green roof can appear daunting.
But a green roof is an achievable project. By following these steps an ordinary space can be transformed into a thriving, sustainable ecosystem.
