Posted: 04/08/2014 at 08:42
Euphorbia Fireflow/griffithii is a thug as are some varieties of artemisia, ESP the yellow limelight. Some campanulas can spread as can lysimachia. Salvia guaranitica as well as uliginosa can spread a bit......So I dig these up every year. Hypericum calicynum is invasive.....very invasive. Some grassss, pennisetums for example, can spread markedly. I think houttynia chameleon has already been mentioned but this is a real problem once it gets into the ground. Think bindweed and double the aggression!
I always research plants I don't know before planting. However, there is nothing like your own experience so I plant some things with a view to check them at the end of the season. If the roots are "travelling" everything goes. When buying plants often a look at the root systems can indicate what they will do.
Currently I am watching my libertias....two vsrieties of the newer golden/olive ones......to see how they behave. So far, after 3 or 4 years, they are fine. I divide them anyway quite regularly
So much in the garden is "invasive"......think raspberries..?
Gardening is a constantly learning experience,,isn't it?