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How to kill an invasive plant Lysimachia punctata

(7 Posts)
jeanie99 Mon 16-Sept-24 16:37:18

I believe this is the name of the plant which is causing me so much trouble.
I have one planted in the front and back garden and I noticed last year there was a patch of small leaves growing in the back garden.
I had no idea what plant the leaves came from but wasn't able to fork them out as the soil was rock hard.
Moving on to this year I notice the same leaves again growing but this time near the plants in both garden.
The ground here is now soft and I was able to dig down and start removing what I thought would be short roots.
This plant as a deep root system which goes on and on, I have taken so much out and it is growing into the roots of other plants, it's a nightmare.
Are there any other gardeners who have had this type of problem and how did they kill off the plant.
Thanks so much

karmalady Mon 16-Sept-24 16:44:12

I have invasive passionflower next door and quickly noticed its roots popping up new shoots several m away from the joint wall, old wall without foundations. That weekend I purchased bamboo barrier and spent the whole weekend putting that down, maybe 12 inches, into the soil about 10inches away from the wall. The barrier is impregnated with copper

I pulled up any roots that I could find in my garden, luckily distinctive. Not had a problem since, next door still has the passion-flower and I put a copper solution down between barrier and wall every year or so

Jaxjacky Mon 16-Sept-24 16:47:37

I’ve found SBK brush killer the best.

jeanie99 Mon 16-Sept-24 17:18:29

Karmalady
Best of luck with the work you have done I hope it solves your problem in the long term.

Jaxjacky
How did you apply the killer?
I've pulled huge amounts of roots out but not sure if I have all of them, this is in the back garden.
In the front garden the plant is still there but growing into other plant roots.
How would you deal with this situation.
I was thinking take the nuisance plant out and wait until the dormant season to take out the plant where the roots have been grown into, then replant it.
What do you think?
Thank you

Jaxjacky Mon 16-Sept-24 17:53:04

I used i5 on mares tail and painted it onto the emerging shoots with a very small brush, had to be done twice.

Jaxjacky Mon 16-Sept-24 17:55:10

It not i5..

jeanie99 Sun 06-Oct-24 10:55:03

What is i5!!