Public gardens in Brandywine Valley, Pa.

Longwood Gardens in Kennett Square, Pa., is the country's premier horticultural display garden. It's a year-round destination, thanks to its four-acre Edwardian conservatory.

Public gardens in Brandywine Valley, Pa.

Longwood Gardens in Kennett Square, Pa., is the country's premier horticultural display garden. It's a year-round destination, thanks to its four-acre Edwardian conservatory.

(Longwood Gardens / L. Albee)

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