By CBS3 Staff

KENNETT SQUARE, Pa. (CBS) — Longwood Gardens unveiled a $250 million project on Thursday, which was more than a decade in the making. The project will transform one of America’s greatest gardens.

Longwood Gardens said it will add new buildings, pools and plantings across 17 acres.

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The centerpiece will be a 32,000-square-foot glasshouse.

Longwood expects to break ground on the project this spring.

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The main and east conservatories will remain open during the project.