Oh yeah, they certainly do seed themselves around. I've even got several
different BBs coming up in cracks in the walk (and quite a distance from any
others).....and they're blooming. They don't look particularly true to any
likely parents, but they're sure pretty anyway.
Anyway, I've given away seedlings that do quite well, and transplanted some of
my own. Otherwise, it's easy enough to weed them out; they don't seem to
reproduce in the thousands or anything like that and they're shallow-rooted.
nNJ usa z7a
There are also some "dwarf" varieties that aren't out to take over the
world. They're not nearly as leggy as the standard varieties and are
prettier in my opinion. Varieties such as White Ball, Purple Plum, and Nanho
Purple all remain under 5' X 5'. The only pruning my Nanho Purple gets is an
occasional haircut between blooming periods as a lazy method of keeping it
deadheaded. I never have to cut it to the ground in the spring the way the
way I do the standards varieties. On the other hand, I have a Honeycomb that
often attains 8' X 8' by fall even after being cut to the ground each
spring. It, however, seems to be the favorite of the butterflies.
Buddleia spread themselves by seed.
Buddleia davidii has an entry in the Brooklyn Botanic Garden publication
_Invasive Plants: Weeds of the Global Garden_.
"Butterfly bush does not yet present a serious problem but is spreading rapidly"
according to the book.
It "has escaped from cultivation along the eastern seaboard from Pennsylvania to
North Caronlina, and along the West Coast in California, Oregon and Washington."
"It generally colonizes disturbed areas such as roadsides and riparian zones."
(That last bit may be what could eventually be very troublesome.)
"Other members of this genus (for example, B. madagascarensis, B. lindleyana,
and B. asiatica) have also shown strong invasive ability while others (such as
B. globosa) have not."
One presumes it does, if it is able to set and ripen seed. My clump never
has. Usually we have a killing frost before it is able to.
Pat in Plymouth MI
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