How Do I Maintain A Green Roof?
Remove any unwelcome weeds in your green roof proper by gently twisting and lifting them out by the root
Maintaining a green roof, especially an extensive green roof can actually be extremely straightforward. The combination of shallow substrate and carefully chosen low nutrition growth media will preclude the growing of most plants other than the ones you’re actively trying to grow.
As such, you can expect your weeding duties to be fairly minimal for an extensive and even semi-extensive roof garden. While you won’t need to access your green roof daily, it’s highly beneficial to be able to access your roof occasionally. Once or twice a year, it’s a good idea to carry out the following checks;
Check that your drainage outlets are clear and free from unwanted vegetation (that’s where those pebbles come in).
Make sure plants are well watered in long spells of dry weather, especially those that are recently planted (12 months or less).
Make sure that the gravel or pebbles around the edging are also free of weeds and unwanted vegetation.
Check for bare spots on your green roof. Re-plant them with cuttings, bulbs or seeds as appropriate, ensuring that the area will get sufficient water to sustain the plant in question.
Remove any unwelcome weeds in your green roof proper by gently twisting and lifting them out by the root. Whatever you do, avoid pulling them out with a fork as this can risk damaging the waterproof membrane.
Of course, depending on what you plant in an intensive roof, you may need to carry out further maintenance to ensure that you create the optimum growing conditions for your plants, although the same basic checks should still be carried out.