The Nancy Thomas Horticulture Lecture was established in 1995 and is held biennially in February. This event focuses on horticulture. Recent speakers have included Adriaan Geuze, William Cullina and Antonia Adezio.
Julia Picton Wallace Lecture, begun in 2006 and is held biennially in the fall, and is devoted to the subject of floral arrangement. These speakers are prominent floral artists who give a demonstration and speak about the methods and skills necessary to floral arranging. Presenters have included Elisa DeJong Stout, Natasha Lisitsa, Jane Godshall, Soho Sakai and Bruno Duarte.