Grandma and Grandpa didn’t used to grow such now-common plants as nandina, cherry laurel, Leyland cypress, and crape myrtle in their central-Pennsylvania landscapes.
It was just too cold here for them to be reliable winter bets. Garden centers didn’t routinely carry them anyway.
Then the climate began warming.
Winter lows got milder, summers got hotter, and frost-free growing periods got longer, turning what used to be borderline-hardy plants into surer bets.
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