This 8 April 2020 video from the Netherlands says about itself:
On 9 April, an exhibition starts in the Leiden botanical garden. Because of the coronavirus, visitors cannot go to it. So, now, the exhibition is online.
They say about the exhibition:
In 2020 it will be 400 years since the voyage of the Mayflower, which sailed to America with a group of English separatists known as the ‘Pilgrim Fathers’ on board. Before the Pilgrim Fathers made the crossing and founded the Plymouth Colony in 1620, they lived and worked in Leiden, free of persecution for their faith by the English crown.
Four hundred years after this voyage, America, England, the Native Nations and the Netherlands will be cooperating in organizing commemorative activities. Not only the story of the Pilgrim Fathers will be spotlighted, but also the cultures and places with which they came into contact. The city of Leiden will join in with the international commemoration via the Leiden 400 theme, including a programme of events covering culture, science, education, heritage, heritage-tourism and society.
The Hortus botanicus Leiden will be highlighting the plants that made the Atlantic crossing in the exhibition From Columbus to the Mayflower: seeds over the sea, from 9 April to 26 November 2020. The herbarium compiled by the Flemish botanist Rembert Dodoens (1517-1585) will be used as a guide; the Pilgrim Fathers brought a copy of this book with them on their crossing and it already included a number of plants from the ‘New World’ such as maize, tomato, tobacco, pumpkin and the sunflower.