How do you maintain a green roof?

A green roof needs proper maintenance, despite the fact that a green roof is basically low-maintenance. If you maintain the roof properly and keep it in top condition, you will enjoy a long life. But how do you maintain a green roof? And is there a difference between a sedum roof and a biodiverse roof? And can you just walk over the plants while performing maintenance? We will look into this in more detail.

Maintenance of a green roof

Despite the fact that a sedum green roof is very low maintenance, it still needs to be maintained. This applies to both a sedum roof and a biodiverse roof. During the maintenance of both types of green roof, you can simply walk over the plants, as they are resistant to this. However, we do make a distinction between the maintenance of these two different green roofs. The maintenance requires a different approach.

Maintaining a Sedum roof

In case of maintenance of a sedum roof It is important to check the green roof twice a year for windblown herbs, preferably in spring and autumn. You can remove these unwanted plants by hand. Do not use pesticides. We recommend fertilising the green roof twice a year, in April and at the beginning of September to be precise. If the roof is well rooted, it is not necessary to water the green roof. Are there dry periods in the first year after installation? In that case we recommend that you water the green roof every week.

Maintaining a biodiverse roof

A bio-roof requires a different kind of maintenance. Because the natural balance of sheets on your bio-roof can change, this roof usually does not need extra watering or feeding. Only in very dry periods is it advisable to water the green roof on a weekly basis. To maintain the vegetation, you should mow the roof once in autumn. We recommend doing this in September, when the life cycle of the bees is complete. Mid-June is also a suitable option. Do not forget to remove the loose greenery from the roof within 4 days, so that the greenery does not receive any excess nutrients.

Want to know more about maintaining a green roof?

Do you have a question about the maintenance of a green roof, or about the purchase of one of the Sempergreen green roof packages that we offer? Feel free to contact us for more information. We are happy to help you green your environment. You can contact us by leaving your question and contact details in the contact form, calling us at +32 2 486 64 57 or send your question to We will then get back to you as soon as possible with an answer to your question.