Gillian, your sambucus query might get more response in a new thread, as ground elder is a very different beast and people just want to get rid of it.
But for what it's worth, once sambucus is established it's very tough. You can cut it right back in the spring and it will grown new shoots. As long as yours seems alive, I'm sure it will recover. Then next spring you could try taking out a third of the biggest stems, to encourage new growth.
Crush the leaves it starts working quicker !! Try this method : 1) First have at hand a reasonable size polybag and position it around the weed so that the weed is contained inside- t hus seperating it from other plants , (2)Crush the leaves slightly , (3). Paint on a weedkiller containing gypphosalite onto the crushed leaves using a small paint brush(. this method is slower but for me it has always worked better).
hold down with stones still use cardboard and tubes if required.
I have mostly rid my garden of ground elder by clearing one small area at a time and planting macrorrhizum geraniums in the area. They clump up and smother new ground elder growth. Then I have taken cuttings and repeated the process with the new plants. Seems to have worked very well and now replace the geraniums when the area is clear with different plants.
What a good idea inverglen, may well try that on my troublesome patch, thank you
Verdone has greatly reduced ground elder in my lawn. I have also used it where I can spray safely in the flower bed. Digging out seems to have worked but still got small patches.
I will continue digging spraying and try Marigolds and geraniums!!
Very keen to try the marigold trick. Despite several years of trying to dig it out and failing to get rid of it with glyphosate, ground elder has now spead into my asparagus bed. Can anyone tell me if the Marigolds could harm the asparagus too......obviously don't want to losse it all.