Carolus Clusius

500 years of Carolus Clusius (1526 – 1609)

Written in: Dutch • Randy Koo • 9 February 2026

Clusius is best known as the one who brought the tulip to the Netherlands and spread the potato throughout Europe. He was born in 1526 in Northern Flanders as Charles de l'Écluse. In his adult years, he traveled all over Europe...

450 years of Leiden University: Botanical Garden

Written in: Dutch • Randy Koo • March 3 2025

Leiden University was founded in 1575 and is the oldest university in the Netherlands. The university has seven faculties (six in Leiden and one in The Hague), with 33.701 students enrolled in 2025. Every resident of Leiden has at some point...

Peter over Delta Works: The Netherlands and water with climate adaptation: Thank you very much for the nice explanation of the design.

Written in: Dutch

Annet Hogendoorn over The piss-pots of Tilburg: Another super fun blog post, and educational :)

Written in: Dutch

Lars over Delft Blue Ceramic stamp a 'deception stamp': Now just get those blueprints out of the catalog..

Written in: Dutch

Erik Boeré over Delft Blue Ceramic stamp a 'deception stamp': The best solution is probably to ignore the ceramics stamp altogether. Fortunately, as the NVPH/Catalog Committee, we already have…

Written in: Dutch

Yvonne Kruse over The piss-pots of Tilburg: What a nice article, Willem!

Written in: Dutch

Willem over Stamp Day 2026: “I would like to know . . .?”: The Delta stamps can already be found on Marktplaats. A beautiful design! In my opinion, that is an example of how collectors want it.

Written in: Dutch