By Arbuthnot
Buckinghamshire,
United Kingdom 
I planted an Eryngium a few years ago on the patio side of a raised bed. However, it was taking over so twice I dug it out - I thought! But no, now I have lots of little stems growing. So I sprayed with an extra strong weed killer. I did this several times but all that happens is that the small plants are deformed and digging them out is difficult standing on the patio as I can’t balance on the edge of the bed. I have the same problem with Welsh poppies - deformed stems but the darned things are still trying to flower. Lovely though they are I only have a small garden and I don’t want Welsh poppies smothering other plants.
What can I do?
2 Jun, 2023
Answers
I was afraid it wouldn't be easy SBG but was hopeful that someone had found a quick treatment. I'll allow the small stems to get a bit more leaf than blast them again with SBK. I must learn patience!
6 Jun, 2023
I thought SBK was for woody plants, trees and shrubs?
7 Jun, 2023
It might be SBG but the Japanese anemones don’t seem to like it. Whether the spray will actually kill it off is a moot point though. However, the label on the bottle just say extra strong weed killer so I live in hope.
8 Jun, 2023
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dead head any flowers that do open so no more seed is made. Then spray the Eryngium mid summer with a glyphosate weedkiller from mid summer on. This will hopefully destroy the root stock over the autumn. Sadly you will have to keep doing this until it gives up.
2 Jun, 2023