The group is all women my age, no men, no younger gardeners, and there doesn't seem to be much real plant knowledge. They seem to have mostly perennial and flower gardens.
Anyway, Kevin Wilcox from Farmington Valley Nursery was there to talk about trees and shrubs, and although all of the plants his slideshow presented I already knew, I did learn the following:
When pruning a cut back shrub like Cotinus smokebush, or Lupulus golden hops vine, root prune it as well in early spring. Otherwise, the roots get very large and store enough energy to fuel too much growth as it leafs out and it gets too big even in one season.
(Cut the new growth of the smokebush back a second time in spring when it has leafed out to about three or four feet high. Cut the newly emerging rowth back by about a third then.)
(Cut the new growth of the smokebush back a second time in spring when it has leafed out to about three or four feet high. Cut the newly emerging rowth back by about a third then.)
So it was worthwhile after all.
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