what is the second topic about?
It is the agriculture of plants, mainly for food, materials, comfort and beauty for decoration.
Horticulture
Horticulture ("Hortus-" garden, "culture"- cultivation) is the agriculture of plants, mainly for food, materials, comfort and beauty for decoration. 
what is briarcliff farms? It was a farm. where was it located? Briarcliff Manor, Westchester County, New York. did it have any greenhouses? Yes why were they used? To produce American Beauty rose and rare carnations. was it a school as well? Yes what was taught there? Instruction was offered in agriculture, horticulture, cold storage, botany, chemistry, geology, physics, agricultural zoology, entomology, beekeeping, meteorology, land surveying and leveling, soils, drainage, irrigation, tillage, fertilizers, plant diseases, stock, fruit growing, landscape gardening and bookkeeping.
wiki:19504208
Horticulture [SEP] Introduction
Horticulture ("Hortus-" garden, "culture"- cultivation) is the agriculture of plants, mainly for food, materials, comfort and beauty for decoration. Horticulturists apply knowledge, skills, and technologies to grow intensively produced plants for human food and non-food uses and for personal or social needs. Their work involves plant propagation and cultivation with the aim of improving plant growth, yields, quality, nutritional value and resistance to insects, diseases and environmental stresses. They work as gardeners, growers, therapists, designers, and technical advisors in the food and non-food sectors of horticulture.