Botanical conservatories take on urgent new role

Jan Salick, senior curator of ethno­botany at the Missouri Botanical Garden, studies how Tibetan people use high-alpine plants on the eastern edge of the Himalayas, where temperatures are rising quickly. The region is experiencing the fastest glacial retreats in the world and dramatic increases in rainfall. High-alpine meadows, rich in biodiversity, contain rare plants. Dr. Salick's field research shows that as temperatures climb, so do plants – they migrate uphill. The ones migrating fastest are not those endemic to the region, but widespread species that reproduce quickly, outcompeting slower-maturing alpine plants.

The snow lotus, for example, which Tibetans regard as an important medicinal plant, takes 10 years to reproduce and must be pollinated by high-alpine bumblebees. Salick has watched this plant diminish in both size and numbers. "Not until after the fact do you get to see the effect of changes in plant communities on such things as the bumblebees and other long-coevolved, intricate relationships with animal species," she says.

Making 'greener' greenhouses

As the climate changes, Salick and others foresee changes in the form and content of conservatories. Tomasz Anisko, curator of plants at Longwood Gardens in Kennett Square, Pa., says the institution, which focuses primarily on horticultural display, renovated its east conservatory in 2006, in part to improve energy efficiency. With each renovation of Longwood's 1920s-era buildings, the heating systems have been updated to heat soil at the root zone and concentrate hot air immediately around the plants, instead of heating the whole space.

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."

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."

Previous

1 | 2