Stopping irises from spreading can be a challenging task, but with the right approach, it is possible to control their growth effectively. One method that has proven to be effective is covering the plants with a heavily weighted tarp for an extended period of time, typically several years. This technique works by depriving the plants of sunlight and preventing them from growing and spreading further.
When using this method, it is important to ensure that the tarp extends well beyond the edges of the iris patch. This is crucial to prevent any sunlight from reaching the plants and stimulating their growth. By covering a larger area than the actual patch, you can also prevent any new rhizomes or seeds from sprouting outside of the designated area.
To further prevent the spread of irises, it is important to remove the seed pods before they have a chance to disperse their seeds. Regularly inspecting the plants and promptly removing any seed pods that appear can help prevent the spread of irises. However, it is essential to note that removing the seed pods alone will not harm the plants or prevent the spread of rhizomes, as irises can also reproduce through their underground rhizomes.
In my personal experience, I have successfully used this method to control small patches of irises in my own garden. By covering the plants with a tarp and ensuring it was weighted down securely, I was able to significantly limit their growth and prevent new plants from sprouting. However, it is important to note that this method requires patience and persistence, as it may take several years to completely eradicate the irises.
In summary, to stop irises from spreading, covering the plants with a heavily weighted tarp for several years can be an effective method. This technique deprives the plants of sunlight and prevents their growth. Additionally, removing the seed pods can help prevent seed dispersal, although it will not prevent the spread of rhizomes. It is important to extend the tarp well beyond the edges of the patch to ensure effective control.
