Oh my, that makes so much sense! It is so interesting really, the whole debate on indigenous and alien species. On this side of the pond, we have so many Australian trees growing, so there are many programs to get them out of the fynbos (protea) fields. These Australian trees make for the best firewood though.
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I think what is 'native" is quite fluid over time. We get too caught up with it I think. Sure, if it's totally damaging the existing species, something must be done. But I'm not entirely sure why it's necessary to have pristine native environments at all costs. Look that's not entirely true... I'd get upset with our wildernesses tainted by invading species, but in urban or semi rural environments I think a dandelion or an olive or a protea can be just as valid as a gum tree.
So true yes! I agree 100%. We have forest areas where they previously grew trees for logging and paper and whatever other reasons they used the trees for. But now they are competing with native plants, and this is sad and unnecessary. Wild spaces are getting so small and secluded, that the few we still have should not be invaded by alien species. But in urban areas, the ground and soil are probably not native as well. Funny thing, the indigenous plants (like proteas) struggle in my garden because it is not the right type of soil; so people brought in different soil to plant their gardens.