![]() Some plant mortality is normal during the green roof establishment period. ![]() If frequent observations of the roof condition are not practical, then more frequent weeding should be scheduled. Weed cycles on the roof should be noted and weeding schedules adjusted to maximize effectiveness. Pulling weeds when they are small and before they set seed will maximize weeding efficiency. Green roofs should be weeded more frequently if needed to prevent weeds from setting seed, or if tree seedlings or any other species threaten the integrity of the roofing assembly. Once the vegetation is established, a green roof typically needs to be weeded 2 to 3 times a year if done strategically at times just before weeds go to seed. Control invasive species to the required maintenance specifications. Maintenance specifications should state performance requirements. ![]() Vegetation free zones as well as vegetated areas will require weeding. Weeds that are especially common on green roofs include, for example:ĭo not use herbicides, pesticides or any other chemicals that could negatively affect the roofing membrane or warranty. Since tree roots can damage roofing components, timely tree seedlings removal is especially crucial. If weeds are left to spread uncontrolled, they can choke out desirable plants and compete with desirable plants for nutrients and water. While some weeding will always be necessary on a green roof, as green roofs will always be exposed to weed seeds, for example, via wind and birds, weeding is particularly important during the establishment phase when the roof is not yet fully vegetated and there is more open ground in which weeds can germinate. 7 Other factors to consider during green roof maintenance period.Typical green roof maintenance tasks include the following. Therefore, it is always preferable to look for a contractor with experience in green roof services. The plants and soil conditions that characterize green roofs are unfamiliar to most landscape service contractors. Because some maintenance will always be needed on a green roof (and also on a traditional roof), it is crucial to budget for maintenance and maintenance inspections during the project planning stages and identify responsibilities for that maintenance. proximity to weed sources, views of the roof), rainfall and irrigation, and growing medium depth. Level of maintenance needed is influenced by many factors, such as, for example, project goals, and project location (e.g. Depending on the density, condition and species of vegetation planted, climate, and level of maintenance, a green roof is typically well established within 2 to 5 years after planting. once most of the green roof surface is covered with desired plants, invasive species are minimal, and there are very few areas of bare ground) maintenance is still crucial, but maintenance needs typically decrease. Once the vegetation is well established (i.e. It is recommended that the first 5 years of maintenance are included in the installation contract. Green roof maintenance is particularly important during the first five years after green roof installation to ensure vegetation becomes well established. Consult with a roofing consultant or manufacturer for roof membrane maintenance requirements. This article addresses green roof vegetation maintenance only. Green roofs create green space for public benefit, energy efficiency, and stormwater retention/ detention. Green Infrastructure: Green roofs consist of a series of layers that create an environment suitable for plant growth without damaging the underlying roof system.
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