Please help me identifying this plant.

[cuddly_cuspid]

Hello,

I'm trying to identify and possibly remove these plants out of my garden. Last year, when I moved in into a new house, they were all over the place and I trimmed them from the bottom. Now they are sprouting again, their roots going 50-60cm deep and are pretty thick.
I've tried googling and LLM but they do not seem to identify this plant correctly.

 

[DiggersJo]

Looks like Himalayan balsam to me, not good if it is.

 

[cuddly_cuspid]

Most of the pictures I see upon googling Himalayan Balsam contain plants with flowers, but I am not sure I have ever observed them on the ones I see in the garden. Also judging by the pictures of baby plants they do not look similar.

Maybe additional information helps: Their roots are running deep into soil, I would say they are thick as a thumb or sometimes larger. They appear to have some rose notes but are generally white/milk coloured.

 

[DiggersJo]

You might be right, but it may be worth searching for "young himalayan balsam". I use duckduckgo for searching, but sure Google will come up with similar. I say you may be right as I can't find an image with the same centre growth as yours, but the leaves are similar. Unfortunately my only experience of it is the river near by where it is rampant. I'm sure no one would mind if I dug some up, but not sure I want to do so.

 

[cpp gardener]

It's not Himalayan Balsam. That's a species of Impatiens. It is a species of Polygonum/Persicaria. That's the same genus as Japanese Knotweed which can be almost impossible to control. Full strength glyphosate (Round-up) will work, but still takes multiple applications.

 

[Oliver Buckle]

Those leaves look awfully like dock, Rumex. The flowers are inconspicuous, but produce a lot of seed, and the tap root sounds right, if you catch them young they are not bad to remove, but bigger old ones can go deep. There are quite a number of different species varying slightly.

identification dock weed - Google Search

 

[cuddly_cuspid]

Seems like @cpp gardener is right. It is japanese knotweed. Even though googling shows that grown plants contain flowers (that I did not observe in my garden so far), baby plants look exactly the same, so I assume that is the right answer.
Thank you!

 

[Oliver Buckle]

It is a species of Polygonum/Persicaria. That's the same genus as Japanese Knotweed

t is japanese knotweed. Even though googling shows that grown plants contain flowers

I think you have misunderstood, similar to but not actually knotweed is what I think cpp is suggesting.
As I understand knotweed itself has male and female plants, and so far only the male plant has been imported into Europe, so spread is purely from stray bits of root so far, thank goodness they are not making seeds.

 

[cuddly_cuspid]

I think I am confused now.
I've googled both Polygonum and Persicaria and their baby forms and they look nothing like what I have in the garden. I also vaguely remember their grown forms (I cut them off last year). Googling Japanese Knotweed on the other hand shows me the desired result.

 

[cpp gardener]

Originally Japanese Knotweed was in the genus Polygonum. Japanese Knotweed was Polygonum cuspidatum. That genus was split into Persicaria and Fallopia. Japanese Knotweed is Fallopia japonica. Don't you just love botanists?
So, it may be Fallopia japonica, which used to be Polygonum cuspidatum.