Ever since we’ve lived in this particular apartment in
Brooklyn, the ivy has been taking over the building. Lately, it’s begun to look as though the ivy might succeed
in eating the building whole. It’s gobbled up the back wall as it's climbed the
bricks.
And it’s almost completely covered up our windows, suctioning itself to the screens.
Even more lately, the ivy has managed to push its way inside
our dining room.
Sound like something out of a science fiction book? It’s
just another creepy chapter in the life of English Ivy.
English Ivy—Latin name Hedera
helix, and also known as Gum Ivy, True Ivy, and Woodbind—originated in
Northern Africa, West Asia and Europe. It was brought to our continent by
English settlers in the 18th century. They thought it was pretty. Did they know it was an invasive species, destined to take
over cities and forests? Did they care??
English Ivy is so invasive that experts say it
threatens native plants and trees. If a
tree is covered with ivy, it doesn’t get enough sunlight to achieve
photosynthesis. After a while, it withers up and dies. What about (non-living) buildings?
If a building is covered in ivy, the ivy eventually begins to gnaw away at the
mortar between the bricks, and the bricks themselves. If you try to pull the ivy off, you risk pulling out bits of the building, too.
This excellent article explains how ivy grows. Here’s a riveting excerpt:
“First,
the plant makes initial contact with the object it will climb. This then
triggers the second phase, when the plant's roots change shape to fit the
surface of the structure they will climb. The roots alter their arrangement to
increase their area of contact with the wall. Small structures called root
hairs grow out from the root, coming into contact with the climbing surface. The
plant then excretes a glue to anchor it to the substrate. Finally, the tiny
root hairs fit into tiny cavities within the climbing surface. There, they dry
out, scrunching into a spiral-shape that locks the root hair into place.”
Apparently, this lets the ivy hold on even when the plant is
dead. What do you think, are we doomed in Brooklyn?
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