There is not a single novice run, but there are many tough tree-lined runs, plus two funnels through which many skiers converge.
"When a tree that size falls over," she said, "it makes you appreciate how tough trees are in fact — that they can get to that size".
Fit to thrive in dirty, confined environments for two hundred years at a stretch, London planes are, one arborist told me recently, "tough, tough trees.
"These are tough trees, but we're entering a whole new era," he said.
The project's aim is not to breed up a tougher tree but to create one through genetic engineering.
By Elizabeth Kolbert Researchers are hoping to "assist" evolution in order to produce hardier corals and tougher trees.
The discovery that trees with resistance to ash dieback may produce fewer chemicals that ward off insects such as the emerald ash borer emphasises that the project to breed tougher trees will have to proceed carefully, said Buggs, who also works at the Royal Botanical Gardens at Kew. "It emphasises how difficult it might be in the end to breed a tree that is resistant to both," he said.
"It's quite a tough landscape tree," she said.
Cattle and horses, being heavy and large-footed, can trample and eat tough young trees that encroach on finer plants.
It is a tough, fast-growing tree that tolerates city conditions; it is available in several varieties (cut-leaved, white-fruited, and variegated) that find use as hardy ornamentals and in naturalized landscapes.
The varieties on the sidewalks depend on many conditions, but the most common are the honey locust, a tough, drought-resistant tree, and the callery pear, noted for white flowers that, in springtime, canopy the sidewalks of New York.
