Young Plants Availability Our Brokers Resources Plugs from Seed Knox Horticulture produces a wide variety of Plugs from Seed, taking advantage of our climate-controlled germination rooms and the high light and ideal temperatures Central Florida provides. Vegetative Liners (Rooted Cuttings) Knox Horticulture produces an extensive variety of Vegetative Liners, including a wide range of bedding plants and Geraniums, Garden Mums, and Poinsettias. Liners from Tissue Cultures Knox Horticulture now provides several varieties of Liners from Tissue Cultures, including Gerbera Garvinea and specific varieties of Cordyline and Ferns. Gerberas Knox Horticulture was one of the first to offer Gerbera plugs to commercial growers. Our Gerbera program began over 25 years ago. Today, Knox Horticulture ships Gerbera plugs to growers throughout the country. Geraniums Knox Horticulture has an extensive line of Geranium varieties. Garden Mums Knox Horticulture produces a range of Garden Mums from Gediflora, Dümmen Orange and Syngenta. Poinsettias Knox Horticulture offers rooted cuttings of all cultivars from all Poinsettia breeders for both Stock Plant production as well as Summer Plant production.