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Botanical conservatories take on urgent new role

Speed of climate change makes glasshouses bulwarks in the battle to preserve biodiversity.

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Energy use has also in­­fluenced which spe­­cies to display. "In the past, we ex­­hibited mainly exotic tropical plants that required high temperatures, and we've been replacing them with subtropical and Med­iter­ran­ean plants that can grow in more moderate temperatures," Anisko says, and visitors approve. "That's an important point: You can still design attractive displays and achieve energy savings."

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Educating visitors is something Anisko and others believe is a significant opportunity for conservatories. "People don't come to see seeds in the freezer, but to see beautiful plants," Havens observes.

Salick recalls the success story of educating people about the destruction of tropical rain forests. "Public awareness of that issue is amazing," she says. "Kindergartners will ask me about it."

Todd Forrest, vice president for horticulture and living collections at the New York Botanical Garden, says they are targeting average gardeners through an educational program called Gardening in a Changing Climate. "It's important to keep people gardening and give them hope," he says. "Gardens and green spaces are part of the solution to climate change. They provide cool spots, and they store carbon. The more of these we have, the better off our environment will be."

How gardeners adjust to a changing climate

“Climatologists tell us that climate change is not as simple as just getting warmer weather,” says Todd Forrest, vice president for horticulture and living collections at the New York Botanical Garden. “They predict that it will become warmer year-round, significantly so in winter, but there will also be great variety in precipitation, increased drought, and more frequent extreme precipitation events. This means we have to take a broad approach to keeping gardens healthy.”

While it is relatively easy to avoid pesticides, gardeners may have a harder time figuring out how to reduce gardening practices that contribute to climate change – and perhaps more worrisome, how climate change is affecting their gardens. Mr. Forrest, who has launched an educational program called Gardening in a Changing Climate, offers guidance in the face of climbing temperatures and “weather weirding” – sudden, often violent, shifts in temperature, wind, and precipitation.

Much of what horticulturists at the New York Botanical Garden have learned from these ventures runs true to the good-gardening practices that have been evolving since the first Earth Day in 1970: “We teach people how to use fuels more efficiently, to choose plants adapted to the local climate, that are drought-tolerant, that aren’t prone to insects and diseases,” he says. “It’s also important to design gardens that take advantage of the natural topography, instead of fighting it.” Rain gardens, for instance, can store water collected on site for use in a later drought.

Unpredictable snowfall, combined with sudden drops in temperature, can mean uncovered plants damaged from freezing, sunburn, and windburn more often than in the past. “We may need to bundle up more of our shrubs in burlap,” he says, to make up for the lack of insulating blankets of snow.

At the New York Botanical Garden, Forrest says, “We are removing pavement where we can and looking at permeable pavements and the overall impact of what we do. It’s not just about temperature, but about the whole landscape.”

Forrest’s most comforting guidance relates to “gardening as a spiritual act” during a confusing and distressing age: “Gardening keeps people in touch with nature. Some say we’ve always been learning to adapt to changing weather, and we can teach others to do the same thing. Good gardening practices are good for the environment. At first blush, everything we do – whether drive or use electric lights – is part of the problem. But gardens are part of the solution. So we should garden wisely by being as efficient as we can, but we should never feel bad about gardening.”