Thompson and Morgan Customer service Phone number, Office Address, Toll-Free, Social profiles, Email- Thompson & Morgan is the one of the largest Mail Order Seed and Plant companies and it was founded in 1855. They are able to provide home gardeners with the very best quality of products. This brand also operates throughout the world through its international website and offers its popular seed range through major garden centres across Europe. They supply a large range of seeds and British Grown plug plants to commercial growers and seed wholesalers.