In 1748, a box of seeds collected by a Philadelphia nurseryman was delivered to Painshill Park, an estate 25 miles southwest of London.

Some of those plants – tall trees now – still thrive.

Last year the garden opened an exhibit called American Roots. It includes nearly all the species John Bartram first sent over.

Plants such as sassafras, rhododendrons and Virginia cedar take center stage.

But one of the garden’s most touted plants is wisteria. The seeds were collected a few years ago from an ancient plant that grew in Bartram’s Garden in the 1700s, and still thrives today. It’s likely the same plant Bartram harvested more than 250 years ago.

Admission about $10. Open daily except for Christmas and Dec. 26. Contact: www.painshill.co.uk.