It is one of the oldest and most prestigious gardening organizations in the United States. Its mission is to educate the inspire people of all ages to become successful and environmentally responsible gardeners by advancing the art and science of horticulture. Has some links and information.
Additional products are also there.
This reminds me of the many years of watching my Dad look forward to Burpees Catalog coming and deciding on varieties and types of plants to get. It is regularly updated with information on cactus and succulent societies and suppliers of plants, seeds and literature on cacti and succulents. The CSPM has developed and hosts webpages for more than 100 cactus and succulent organisations worldwide. Commercial Vegetable Production Guides has information regarding artichoke, asparatus, cardoon, rhubarb, beans, peas, sprouts, broccoli, cabbage, cauliflower, carrot, beet, radish, rutabaga, turnip, brassicas, cucumber, melons, squash, pumpkinb, onion, garlic, leek, shallot, sweet corn, popcorn, lettuce, celery, radicchio, spinach, greens, potato, tomato, pepper, eggplant, dill, herbs, okra, sweetpotato, etc. Dow AgroSciences includes information about the food protection act, their insecticide and weed control products.