from National Agricultural Library: one of the largest libraries on agricultural knowledge and a great search option with horticulture-specific search filters for cultivars, plant quality, plant parts (leaves, stems, etc.) and more.
includes highly cited journals in agriculture, like Agricultural Research, Forest Products Journal, Journal of Animal Science, Journal of Soil and Water Conservation and Plant Physiology.
Offers well-researched information covering all aspects of human impact to the environment. Its collection of scholarly, government and general-interest titles includes content on global warming, green building, pollution, sustainable agriculture, renewable energy, recycling, and more.
Includes research related to horticulture in the fields of Agricultural and Biological Sciences and in Earth and Planetary Sciences fields. Find studies related to particular crops, cultivars, composting, farming, pesticides, and more.