The stichting Vrienden van de Leidse Hortus (Friends of the Hortus Foundation) has ANBI status, i.e. it is a Public Benefit Organization (Algemeen Nut Beogende Instellingen in Dutch).
This means that there can be tax benefits if you make a donation to the foundation. ANBI benefits only apply to individuals/companies with tax liabilities in the Netherlands. The tax authorities also make a distinction between gifts from private individuals and from companies. For more information get in touch via firstname.lastname@example.org / +31 (0)71 527 5144.