Like many ou you I have problem with allium neapolitanum, but much worse is Lemon balm. It grows everywhere, even in small cracks in the wall or pavement.
When I first bought my house my mother-in-law bought me some alchemilla molis (sp?) for the empty front garden. She always had a beautiful garden so I figured she knew what were good plants to have. Wrong. They pop up all over the place.
I think the full Latin name is 'The Bastardi, Bastardi, Grape Hyacinth Bastardius!!!
I went out and bought a pale blue muscari and asked non gardening OH what he thought. "Is it the same as that?" He asked. I turned round and hadn't noticed in our new garden at the time that we were overrun with the common form! I've not seen the pale one since, it was obviously raped and pillaged by the hoardes!! Sorry think I got the intention of this thread reversed!
No one seems to have mentioned forget me nots which I inherited but are intent on garden domination and can hang around long enough to inhibit other plants then go black and slimey if you're lazy!
One I introduced myself with some enthusiasm was Chinese Lanterns. Chuffed to bits to get free seeds from down an alley on a dog walk, I grew them on and planted them out to be appalled by them coming up in the lawn and spreading via white, fleshy roots. I've learned never to trust travellers with white fleshy roots they are always PITAs!!
Another WFR (white fleshy root) monkey was yellow Yarrow that I gleefully said yes to as a giveaway from a colleague at work. It looked great year 1 but since suffers from rust and travels into the roots of its neighbours the dirty, rotten thing!!
fgmns are at least v easy to pull up. Mine might have got out of hand, but I have a small garden, so it's not a big job. I do love pulling them out at the end of the season. So satifying. Mine are currently covered in slugs and, no doubt, slug eggs, so mine are going into the council compost. I don't compost hot, so I don't think my own processes would kill the seeds.
I threw some FMNs on the back field last year and they've taken but they are preferable to other weeds that grow there. They are easy to remove my trouble is I have to do it! I can be a lazy gardener 😁
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I finally had enough last year and started digging them all out. Just a handful left to rip out now.
Yes, I struggle too. I've put in loads and none have really taken off.
One I introduced myself with some enthusiasm was Chinese Lanterns. Chuffed to bits to get free seeds from down an alley on a dog walk, I grew them on and planted them out to be appalled by them coming up in the lawn and spreading via white, fleshy roots. I've learned never to trust travellers with white fleshy roots they are always PITAs!!
Another WFR (white fleshy root) monkey was yellow Yarrow that I gleefully said yes to as a giveaway from a colleague at work. It looked great year 1 but since suffers from rust and travels into the roots of its neighbours the dirty, rotten thing!!