What’s the most invasive species of plant native to the UK

Question

One that once its established is impossible to get rid off, must be native to the UK, I don’t want to be introducing alien species

Answer 1

Dandelions I've spent hours getting rid of the blighters  

Answer 2

Couch grass (Agropyrum repens) must be one of the worst, ground elder, bindweed and nettles come a close second, also cleavers and dock. Among the garden plants there are golden rod, mint and crown vetch, all nearly impossible to get rid of.

Answer 3

Got to be either ivy or russian vine (mile a minute).

Both are a nightmare to get rid of and grow at an alarming rate.  

Answer 4

Jehova Inviticus Paininabum. Horrible it is, worse than the incurable crud!!

Answer 5

mint

Answer 6

I'll go for the stinging nettle, it's perennial, self seeds and sends out rhizomes underground. Trying to dig it out is like bouncing a spade on a rubber ball.

Answer 7

There is no contest here... SWITCH GRASS,  hands down. The sodding stuff will overtake a plot in half a summer. It's almost impossible to be rid of of the pig rot stuff.

Answer 8

bind weed

Answer 9

docs, nettles, mint, bramble/black berys.