06/07/2026
I am not as purist as some people might think.
No, I no longer continue adding exotic species to my garden, because there are thousands of native species I want to add, so it's a logistical problem. That being said, I am not ripping out all exotic species, either.
My rules are this: doesn't or very rarely reseeds, doesn't or very rarely speads/suckers, and isn't evergreen (no problems with it shading out habitat). I.e. if it's a PITA to propagate, it's probably innocuous. Secondary to this, if it shows benefit to habitat in addition to myself/my family, it's dropped down to the bottom of the list of species to remove if I run out of space.
Some introduced species are beneficial to pollinators, too, like this thyme that I've had for over ten years. It's absolutely buzzing with activity at the moment. Some of the species are exotic (English bottle flies appear to be a pollinator for this species, for example), but there are some native bees that enjoy it as well.
So far, my list of least-problematic species is pretry short. Heirloom, own-root old-world roses are one (not the hybrid teas, I actually strongly dislike those). The shrubby mint species like this thyme, tarragon, and some interesting mediterranean thing I forget the name of. Tender annual veggies are another. Some blue clumping fescue that hasnt moved from its spot in the decade since I planted it.
The point here is to share how I prioritize what I remove vs keep when it comes to native gardens. This goes for both exotic as well as native species. Usefulness alone isn't a determining factor - after all, many invasive species were brought here on the basis of being useful. At the same time, the discussion of native vs exotic is far more nuanced than the discussions on the internet. A responsible gardener is ready to say "time to go" to any introduced species that suddenly is shown to have invasive tendencies...
And yeah, I know, some of those are going to be sentimental, and it will sting a bit (just a heads up: Japanese maple is one I've already had to kill off, and it's on the invasive species watch list).