Free Cactus Seeds . Very easy to grow and care free, it is commonly grown as an ornamental plant in cactus collections. All of our free plants come with detailed care instructions. Rare Mixed Cactus Seeds, Succulents Seeds, 100pcs/pack GreenSeedGarden from greenseedgarden.com Information concerning the dormancy and germination behaviour of cactus seeds comes from the pioneering studies of alcorn & kurtz (1959) and m cd onough (1964), which demonstrated that light has a stimulating effect on the germination of carnegiea gigantea and stenocereus thurberi. 5,000 sorts of cactus seeds: Join the plant of the month club and receive a different free plant to your home every month.