Unfortunately this is classically representative of the ignorance of
which I speak. The point is that a newly acquired butterfly bush can be
prevented from spreading simply by cutting off the spent flowers.
Period. So if you live in an area where there is none now, you can keep
it that way. Just as if you live in an area not currently burning down,
it can be kept that way by not throwing a match into it. The danger
from matches so far eclipses the danger from butterfly bush by many
orders of magnitude. Kudzu should not be planted in the South, but I
don't think it would even thrive here, without summer water. Kudzu is
an inherently differently sort of plant than butterfly bush, because it
spreads asexually, rooting everywhere it hits the ground. So
deadheading won't work for that. But this isn't the end of the ignorance.
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