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Juglone is the most prevalent biochemical in the Black Walnut. It’s also in Juglans cinerea or Butternut tree as well as Carya ovata, commonly known as Shagbark Hickory. However, these latter two trees have far less juglone in their system compared to the Black Walnut. It is the Black Walnut that carries a negative connotation for gardeners because in the landscape Juglone is the oppressor to many other plants.
The very sound of the words, Japanese Beetles invokes irritation, frustration and gloom among Minnesota gardeners. We can see them in our minds chewing, crawling, and decimating our Roses, our tropical Hibiscus flowers, our Grapevines and….our souls!
As I’m sitting here piecing together the latest tips for pruning deciduous trees, I can look out my window and see a beautiful Betula nigra (River Birch) in my neighbor’s landscape, and right next door on the other side, a massively, giant Acer saccharinum (Silver Maple). I would never have thought there is a common thread between Birches and Maples when it comes to pruning. Yet in spite of their many differences, especially size and look, both need to be pruned in the months of June and July when sap production is relatively lower. Both of these trees “bleed” heavily in late winter when the days are sunny, and warmer (relatively speaking for Minnesota winters), and the nighttime climate is just below freezing. These temperatures trigger a pressure build up in the roots of the Maples, and Birches as well, that pushes the sap up and into the limbs where it will freely flow out of any cut.