How to keep neighbours plants/weeds out of my garden.

[Toddlerteaplease]

I've got a tall wooden fence all the way round my garden, but plants and weeks in the neighbours gardens are still coming through the fence. They are mainly student rental houses, and I don't know the agents. So difficult to get them to keep them under control. I'm really struggling and o keep them down in my garden. Any suggestions?

When you say coming through, are there gaps in the fence, or are they growing under it? It sounds like you need a physical barrier either way, but it would be easier to block gaps in the fence, rather than have to put a barrier into the ground.

I was thinking of putting solid fencng up on your side of the fence, forgot to say that bit!

Some of them are pushing through the device. Some of them are getting underneath. The bottom of the side fences is concrete.

A lot of plants have runners or will grow up from roots that spread. You may need to dig down a foot or so and put in a barrier, like slate or wood.
I the past for this problem we have just dug a narrow trench once every year or two inboard of our own side and severed any roots we find with a spade, pulling up and disposing of the roots on our side, and keeping that area weeded between times. Anything pushing through the fence, just prune it off. IIRC you have to offer the prunings to the neighbour. In your case it sounds like they won't want them, but best to ask if you see anyone from the places, just in case.

I've dug down like that and inserted landscaping fabric vertically into the trench because that's what I had, with enough turned over along the bottom to pile earth on and hold it in place. It's hard work! I might find myself spraying the gatecrashers with glyphosate if I were in your shoes, but bluemongoose is probably being more sensible!

@pickingdaisies

I've dug down like that and inserted landscaping fabric vertically into the trench because that's what I had, with enough turned over along the bottom to pile earth on and hold it in place. It's hard work! I might find myself spraying the gatecrashers with glyphosate if I were in your shoes, but bluemongoose is probably being more sensible!

Our plan only worked because our side was used for veg and it was easy to access bits when there were no plants in that plot!

We've put up a small sign (about 6 inches high) that reads "No Weeds or Unsolicited Plants Allowed". To be honest it has been as ineffective as our other sign "No Cats".

The cats do look at their sign but I think they pretend that can't read. Although to be fair one of the cats that comes in our garden is Siamese and we can't write in Thai so that one is, I suppose, down to us.

Just to check, none of them look like this do they?

agree on the root barrier. It needs to be quite deep, and no gaps – we used a roll of plastic/rubber/anti-bamboo stuff and went about 50cm deep along all boundaries. Then for stuff getting in, stuff it into empty bottles so it grows into the bottle rather than tangling into your garden, and spray inside the bottle with a weed killer that goes back to the roots.