The storm did most of the clearing for them, but it also brought wide‑ranging damage.
Many of the estate’s Monterey pines, about 100 years old, were snapped by the 99mph gusts.
A few Pieris formosa collected by plant hunter George Forrest in 1932 were also destroyed.
One discovery about a plant found natively in the Himalayas has intrigued gardeners across Cornwall.
Long said after speaking to colleagues on other estates, “not a single Magnolia campbellii had been damaged or brought down by the storm”.
Because of that resilience, he believes magnolias could play a bigger role in Trewithen’s future.
“Magnolias could work as a windbreak because you don’t want to stop the wind, you want to filter it and camellia, although they’re an ornamental plant, they’re very wind‑firm so you could under plant the camellias.”
He said future windbreaks “could look like mini-gardens as you’re driving around, it’s not a bad thing, is it?”.
The changing landscape will also alter the experience for visitors walking through the 30-acre garden.