Maintaining your green roof

An extensive green roof is almost maintenance free. But your roof garden will always need a little maintenance. This includes removing weeds carried by the wind and applying fertilizer several times a year. You will not damage the plants by walking on them when conducting this maintenance. They are strong enough to be able to compensate for this. Below we describe the maintenance for both a Sedum roof and a biodiverse roof.

Annual maintenance Sedum roof

  1. Roof inspection

Inspect the Sedum roof at least twice a year for weeds and seeds (carried by the wind) and remove this unwanted vegetation manually. Do this preferably in spring and autumn. To encourage biodiversity, we do not recommend the use of chemical pesticides. In addition, check whether the drainage system is still functioning properly. Remove any leaves blown into the gutters and drains.

The number of inspections will depend on the greenery in the vicinity of your roof.

  1. Fertilization

An extensive green roof must be fertilized twice a year. The best period for fertilizing your Sedum roof is late April and early September. The fertilization ensures an even supply of nutrients, which results in healthy and strong planting.

Sempergreen offers both mineral and organic fertilizers in its range. Click below for more information about our maintenance fertilizers.

More about maintenance fertilizers

3. Irrigation

A well-rooted Sedum roof requires no additional water. Only under very dry conditions is it necessary to provide the green roof with water. Depending on the climate zone in which your green roof is located, it is recommended to apply an irrigation system.

Click on the button below to download this maintenance advice for Sedum roofs.

Maintenance advice for Sedum roofs


Annual maintenance biodiverse roof

A different guideline is available for the maintenance of a biodiverse roof, on which Sedum mats in combination with herbs, grasses and / or flowers have been applied. Download the maintenance advice for biodiverse roofs below.

Maintenance advice for biodiverse roofs