- I had to think on this one, of the past many years. My decisions are what grow more extensively than I would like. Bachelor Buttons spread and grow everywhere. The same with Hollyhock, the seeds spread and come up every where especially where they are not wanted. Fortunately both are not hard to control. I do love MALVA which is related to Hollyhock but better behaved. As far as grasses go it has to be Bermuda grass.
Queen Anne's Lace
- Queen Anne's Lace...I don't even recall planting the stuff, but if it shows up in your garden, pull it up before it seeds. They're EVERYWHERE. Also, do NOT buy bird seed with Thistle as a component. I have THAT everywhere, too. Also, agree on the recommendation to NOT plant ivy, or lamb's ear. Unbelievably invasive.
- —Guest Terry
- It spreads by underground runners like mint (is in the mint family) but also by seeds that blow across the yard and grow in any bare spot. Hard to keep from flowering as it grows too fast to use it all up in tea.
- —Guest Donna
- Bamboo, hands down! Don't ever plant this uncontained unless you have a herd of pandas.
- —Guest Denise
- I planted lemon balm (a form of mint, I think) and found that it spread profusly by seed. I also have spearmint well contained in a sunken, deep plastic pot. It took 3 years of aggressive pulling to remove all the lemon balm seedlings.
- —Guest Tim
Beautiful Fall Color
- Staghorn sumac! I now know that a plant that can prosper at the side of the road will run riot over garden plants, and pop up everywhere.
- Pretty white flowers that you can bend about and they stay that way. Hence the name "obedient." But they were not obedient to containment! Very invasive and fast growing, too. Just wanted to take over.
- This lovely vine spread like crazy, and attracted a beetle-like bug that, when in the larvae stage, would fall off the plant as we went through our gate, stinging and leaving painful blisters on the skin. Very difficult to get rid of!
- I planted Cosmos in a shady spot and they did not bloom at all, they just grew up taller and more leggy.
- —Guest Marty
- Widow's Tears: I was so happy the first year I had these. They are drought tolerant and bloom all summer long and stand up to all forms of weather, bugs and diseases. Plus they are very highly invasive, something the nurseries neglect to tell you when selling. I have Widow's Tears in my back yard, hundreds of feet from where they were originally planted, and they choke out everything around them, including my Blueberry bushes. Kill them everywhere you see the, kill them anyway you can. Dig, Round-Up, boiling water, anything it takes. They are even worse than Wisteria, it you can believe that!
Spearmint or Any mMint
- I planted spearmint in my herb garden. I didn't contain the roots like I was told. This year I had to pull all of my herbs out re-till the garden. Spearmint was growing everywhere even in the lawn. Hate it!!!
- —Guest Joanne
- One person's flower may be another person's weed. The only plants that I have been disappointed with is the American cranberry, only because it didn't thrive. So I replaced them with raspberries. And I also have mint growing which I really like a lot.
- —Guest Eloy
Mexican Petunia and Ginger Lilies?
- Someone gave me two or three plants and I have been fighting them for the past 10 years...same with the ginger lillies, although I think I finally conquered the latter this year! :)
- —Guest brucie
- Once I discovered that Horseradish is VERY invasive, it took me about three years and at least 5 sprayings of Round Up to get rid of it. Luckily, I had only planted it in one of my raised veggie boxes!!! Since I still wanted Horseradish, I purchased two VERY LARGE pots and planted my horseradish there. The pots are sitting on top of plywood. I check everyyear to make sure that it is not growing out the bottom!!
- —Guest Cindy
Bronze Fennel, hands down!
- Have to agree with the previous poster - Bronze Fennel is pure evil! Volunteer seedlings are *everywhere*, and even cutting it back 3 times in one summer it still managed to tower over me (at 5'4") and kill off my lemon balm and other surrounding plants. Best (or worst) of all is that it's a PERENNIAL so the stinking thing resists all effort to kill it off. I'm contemplating resorting to pesticides to get rid of it!
- —Guest Kuesel72