Experimenting With a Global Warming Garden

  • Todd Forrest at the New York Botanical Garden's Ladies Border Garden. (Photo by Brad Linder)

When you think about global warming, you probably think about polar ice caps
melting and rising sea levels. But climate change is also having a more immediate
effect — on gardeners. As average temperatures rise, many gardeners are finding
they can grow non-native plants in their back yards. Brad Linder visited one public
garden that’s been nicknamed “the global warming garden”:

Transcript

When you think about global warming, you probably think about polar ice caps
melting and rising sea levels. But climate change is also having a more immediate
effect — on gardeners. As average temperatures rise, many gardeners are finding
they can grow non-native plants in their back yards. Brad Linder visited one public
garden that’s been nicknamed “the global warming garden”:


Most gardeners know there are some plants they’ll never be able to grow, because
of the climate where they live. But the Earth’s climate is changing, and that means
plants that normally grow in the southern United States are thriving as far north as
New York City:


“This Japanese Flowering Apricot, prunus mume. This is a plant that’s widely
grown further south. It’s actually native originally to China, but it’s beloved in Japan.”



Todd Forrest is vice president for horticulture at the New York Botanical Garden:


“And so what we’ve found with climate change is that this plant survives, because
the winter temperatures are on average warmer. But because there’s variability in
our local climate, it will often have its flowers burned by frost.”



Forrest is walking through the Ladies Border Garden, an experimental section of the
Botanical Garden designed to demonstrate the impact of climate change on plants.
Forrest sometimes calls the Ladies Border “the global warming garden,” because
most of the plants are species that couldn’t have grown in this area a few decades
ago.


Climate change probably has been affecting plants and gardeners for years. But
Forrest says it’s only recently that people have put two and two together and realized
that unpredictable weather patterns are affecting their herb gardens:


“Gardeners at times suffer the sort of head in the sand syndrome. They’re so
obsessed with and attuned to their individual garden and climate. And we’re all used
to being frustrated by the weather. I think for a long time we all just sort of ascribed
whatever change there was or variability to that darn weather again. Acting up.
Raining when it should be dry. Dry when it should be raining. Cold when it should be
warm.”


In some ways, the Ladies Border Garden shows how exciting global warming can
be for gardeners. You can grow all sorts of exotic plants in your backyard if you don’t
have to deal with the long cold winters you’re used to.


Forrest has been able to get dozens of unusual plants to grow in New York, including
Choysia and even a Himalayan Fan Palm. That’s right, a palm tree growing in New
York City.


But just because you can grow non-native plants doesn’t mean you should. Because
foreign plants can easily become invasive species, killing off local plants.
Marielle Anzelone is a botanist and garden designer. Her specialty is working with
local plants. Today she’s planting a native-species garden in a public park:



“All the plants are going to have little signs in front of them that say what they are,
because it’s meant to be educational. People should see a plant, say oh, it’s
gorgeous. Want it. Oh, it’s vibernum nutem. And then run out to their nursery
and get it.”


Anzelone says many people don’t realize how beautiful local plants are. For
example, she says people often buy wreaths made of Asiatic Bittersweet vines —
even though it’s an invasive species that’s been killing off American Bittersweet:


“And people maybe then who hang the wreath outside on their door. A bird comes
and eats the berries and poops it out in Prospect Park or Central Park. I mean, that
is how these things get around. So it’s not just your world in a vacuum and nothing
comes to your garden. I mean, birds travel, insects travel.”


That’s why, under normal circumstances, gardeners have to be careful what they
plant in their backyards. Because non-native plants have a way of spreading and
competing with local plants, and climate change complicates things by making it
easier for invasive species to spread:


“The thing that keeps me up at night is not global warming. It’s extinction crisis. And I
think people think a lot about extinction as being this big dramatic thing. It’s a fire, it’s
an oil spill. But actually it doesn’t work that way. Extinction happens on a small scale
all the time.”



As the climate changes, Anzelone says she understands that gardeners will want to
try new things. But she says they shouldn’t forget about native plants, which feed
native insects and animals.


The New York Botanical Garden’s Todd Forrest admits that the Ladies Border
Garden is both exciting and disturbing. While he can demonstrate that new plants
will grow in New York, he knows that global warming is also killing off plants that
have lived here for thousands of years.


For the Environment Report, I’m Brad Linder.

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