Q.Weeds In Agapanthus, How To Kill
Want to keep the agapanthus but kill the weeds that grow through them. What spray can I use?
Certified GKH Gardening Expert
There isn't a product that will kill the weeds, but not the agapanthus. When the beds are cleared of weeds, you can sprinkle on the mulch a barrier (preemergent) product that prevents new seeds from germinating. But it won't kill existing weeds.
If there is a point where your bulb foliage has died back and is not visible, but the weeds are, you can spray the weeds with an herbicide. But make sure none of the agapanthus is growing.
https://www.gardeningknowhow.com/plant-problems/weeds/weed-control.htm