I agree beebop. I planted an especially lovely, but lethal pink, green & white variegated grass. The first year it looked so pretty and behaved itself, the POW! It spread like wildfire with underground runners and digging it out was a nightmare. In fact, I am still digging out new starts of it every week or so. Although I still plant some of the slower clump forming grasses, they don't go in the ground but rather in my whiskey barrels.
Another big mistake was planting Euphorbia. Although the flowers it sends up in spring are a lovely luminescent green, it too sends underground runners and is starting to become quite invasive. Aggg!!! I will be digging this one out for a few years too.
And then there is the St John's Wort and anemone and and and... :_| :_| :_|

Are you talking about the flowers anemone? If so....uh oh!

tarragon and valerian...... the valerian has been moved to 3 different houses because it got mixed into the root ball of echinacea and it's growing stronger than anything else even though I keep picking it out.

Ditto. I love those dainty little flowers.

Obedience Plant. Just what exactly is it about this plant that's obedient? Obedient to the mothership that commands it to take over the world?

A friend of my DH "found" one left out overnight at a local store and gave it to me. I still drive by that house evey week and it has taken over that whole side of the house (of course, no one has gardened there since I left, so at least it covers the beer bottles they fling there).

...as full of it as he is it certainly would've been well fertilized!

Lamb's ears - planted 2 or 3 little plants 5 or 6 years ago, and have been pulling them out by the fistful last summer and this summer. Still have lots, apparently. X-(

Never again.

My neighbor has a clump of that pampas grass right next to my front property corner. Its allmost enough to tempt me to the use of Roundup, accidently of course. Nah I'll just have to stick with giving it the evil eye.

That's odd. I somehow killed mine when I dug up my tree. The lambs-ear, that is.

Yeah, lamb's ears have yet to turn invasive on me. I've killed several in my time, and I've rarely even had them bloom. Right now, I have the biggest patch of it I've ever had, and they seem to do okay with neglect and occasional watering. I found that I killed them when I paid too much attention to them--I used to pull all the little dead leaves off. --J--

Oh what a naive gardener I was!!!

I actually planted Bishops Weed! In more than one location in the yard.

And Sweet Woodruff too.

Although the Sweet Woodruff is a little easier to remove.

I have considered planting bamboo between our yard and the condo building behind us. Maybe it will drive back the English Ivy they have as a ground cover that I'm continually pulling out of my beds and trees. X-(

Keli

I don't know if invasive is the correct word to describe my experience. The ones I have shed seed like crazy, all of which seem to be viable, judging by the numerous little plants springing up all over the yard. I have been lazy about cutting down the flower stalk before it starts to flower, so there has been plenty of seed produced. The plants I have are very hard to pull out of the soil with the roots intact, which makes the problem worse. The leftover root in the soil always sprouts again.

My previous post refers to lambs'ears.

My grandmother died last winter and this spring violas came up all over in my garden. I swear I only had one or two plants in my flower bed - and they are all the way over in the strawberries. Anyway, I think of them as a tribute my grandmother's gardening spirit since she always grew them along the side of the lake cabin. All of their little smiling faces warm my heart and fill me with memories of her as I garden this summer. :x

OMG, Hellichrysum! (Or is it Helichrysum--heh heh...) The cute little plant with the little round fuzzy leaves. The cute little thing that I probably started from a cutting or a 4" pot became this 6' wide, 3+' tall mound that devoured several of its little plant neighbors. I must have blocked it out of my mind until today, when I noticed the innocent-looking little baby I started from a cutting of monster plant, so I'd "still have one." Careful where you plant it! --J--