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Chen, J., R.J. Henny, and D.B. McConnell. 2002. Development of New Foliage Plant Cultivars. p. 466472. In: J. Janick and A. Whipkey (eds.), Trends in new crops and new uses. ASHS Press, Alexandria, VA.
J. Chen, R.J. Henny, and D.B. McConnell
Foliage plants, defined literally, would include all plants grown for their attractive leaves rather than for flowers or fruits. In general horticultural terms, however, foliage plants are mostly those with attractive foliage and/or flowers that are able to survive and grow indoors. Thus, they are used as living plants for interior decoration or interior plantscaping. Foliage plants, in common terminology, are called house plants.
Foliage plants from the worlds tropical or subtropical regions provide the basis for todays foliage plant industry. From 1956 to 1967, Aglaonema, Dieffenbachia, Dracaena, Epipremnum, Ficus, Peperomia, Philodendron, Sansevieria, Syngonium, and plants from several genera of Palmae (palm) were the major players in the industry. Philodendron dominated all other genera accounting for 50% and 36% of wholesale values in 1956 and 1967, respectively (Smith and Strain 1976). In 1975, Schefflera and ferns (Polypodiaceae) joined the list of the Census of Horticulture Specialties of the US Department of Agricultures National Agricultural Statistics Service (McConnell et al. 1989). However, Philodendron was still the major genus, accounting for 20% of the wholesale value. In 1988, genus Hedera was added to the list (McConnell et al. 1989). The total market segment of Philodendron decreased from 20% in 1975 to 4.7% in 1988. No single genus exceeded 10% of the market value in 1988, suggesting increased diversification in foliage plant production. Ten years later, genera Anthurium and Codiaeum, as well as bromeliads (Bromeliaceae) and cactus (Cactaceae) were added to the 1998 list (USDA 1999). The wholesale value of foliage plants in the US increased from $13 million in 1949 to $574 million in 2000 (USDA 2001). The use of foliage plants for interior decoration or interior plantscaping has become an integral part of contemporary design, playing an important role in our life (Manaker 1997).
Florida has led the nation in the production of foliage plants, accounting for more than 55% of the national wholesale value since the 1960s. In addition to its favorable climate, Florida dominates the foliage market because Florida foliage growers continually introduce new genera and new cultivars to the market. This dramatically expands options for foliage plant usage in interiorscaping.
Aglaonema, Dieffenbachia, Dracaena, Epipremnum, Ficus, Hedera, Philodendron, Syngonium, and plants from several genera of Palmae and Polypodiaceae have been the backbone of the foliage plant industry for almost a half century. A key factor in their dominant position in the market place is the continuous influx of new cultivars, which keep consumers interest in these plants alive. Table 1 shows the change in the number of cultivars of Aglaonema, Dieffenbachia, Dracaena, Epipremnum, Ficus, Philodendron, Syngonium, ferns, and palms during the last 25 years. The new cultivars are developed through either traditional breeding or selection of sports from propagation.
Table 1. Changes in cultivar numbers of major foliage plant genera or groups in commercial production of Florida. Source: FNGA (Florida Nurserymen and Growers Association) Locator 1975, 19881989, and 19981999.
The genus Aglaonema, collectively called Chinese evergreens, encompasses the most ubiquitous plants used in hotel lobbies, airport terminals, and family homes. The number of cultivars increased from 10 in 1975 to 36 at the end of the 1990s. In addition, cultivar release and cultivar retirement have occurred rapidly. For example, when cultivars listed in the FNGA (Florida Nurserymen and Growers Association) Locator 19981999 and 19992000 are compared, five cultivars listed in 19981999 were dropped, and four new cultivars were added in 19992000. Almost all new cultivars were developed through traditional breeding. The Bay series of Aglaonema cultivars is the result of many years of breeding and selection in R.J. Hennys program at the University of Florida (Henny and Chen 2001). Golden Bay is a white-stemmed cultivar and has very bright cream and green color variegation. Emerald Bay has a white and green speckled stem. Sunshine Foliage World, Zolfo Springs, Florida, introduced 20 new cultivars developed by breeders in Thailand. These cultivars, including Jubilee Petite, Peacock, White Rain, White Lance, Brilliant, Illumination, Black Lance, Green Lady, Patricia, and Stars, have different sizes, shapes, and variegation patterns of leaves, and white, green, or pink petioles. Emerald Star and Jewel of India are two cultivars developed by breeders in India that, along with Stars, have been identified as highly tolerant to chilling temperatures (Chen et al. 2001a).
The genus Dieffenbachia, commonly known as dumb canes, is grown primarily for its multicolored foliage. The genus has about 30 species, but the most widely grown cultivars are selections from D. amoena and D. maculata. Through hybridization and selection of sports, the number of Dieffenbachia cultivars increased from only seven in 1975 to 29 in 19881989. It has stabilized at about 20 cultivars since then. Traditional breeding in R.J. Hennys program at the University of Florida produced six released hybrids: Victory, Tropic Star, Starry Nights, Star White, Star Bright, and Sparkles (Henny et al. 2002). These hybrids have different variegation patterns, large leaves with short petioles, and, in most cases, they produce basal shoots freely. The Tropic series Tropic Breeze, Tropic Rain, Tropic Dawn, and Tropic Forest were bred by E.J. Frazer in Brisbane, Australia and introduced by Twyford International Inc., Sebring, Florida. Due to great genetic variation, sports from spontaneous mutations have been selected and patented as new cultivars. For example, Tiki is derived from Memoria Corsii, and Snow Flake, a new cultivar in the market, was derived from Tiki.
The genus Dracaena encompasses about 40 species (Bailey and Bailey 1976), but only six species D. deremensis, D. fragrans, D. marginata, D. reflex, D. sanderiana, and D. surculosa (godseffiana) are commonly cultivated as foliage plants. These species are favored by interiorscapers because of the diverse shapes, colors, forms, and configurations that are available in the market place and because of their ability to survive under low-light conditions with minimum care. There is no organized program dedicated to Dracaena breeding, and the increase of cultivars, regardless of species, is predominately due to the selection of sports from cutting by growers. New cultivars include D. deremensis Gold Star, Kerry, Lemon Lime, Lisa, Michiko, and Warneckii Jumbo.
Of the 10 listed species of Epipremnum, only E. aureum (pothos) is commonly grown as a foliage plant. Commercially, pothos is predominantly propagated through single or double eye cuttings, and tissue culture is not used. As a result, three cultivars Golden Pothos, Marble Queen, and Jade have been in the market for decades. The only new cultivar recently released is Neon, a uniform yellowish-green colored foliage plant. The continued interest in pothos is largely due to its adaptability to interior conditions and versatility as a pot, hanging basket, or totem plant.
Boston fern (Nephrolepis exaltata) played a key role in the initiation of Central Floridas foliage plant industry, because it was the first and almost only plant grown from 1913 to the early 1930s (Conover et al. 1973). Today other ferns being grown in Floridas foliage industry include Adiantum, Asplenium, Cyrtomium, Davallia, Nephrolepis, Platycerium, and Pteris. Collectively, fern cultivars increased from 10 in 1975 to 54 in 19981999. New cultivars from the genus Adiantum are A. hispidulum Bronze Venus, A. pedatum Finger Maiden Hair Fern, A. raddianum Fragantissimum and Gracillimum, and A. tenerum Scutum Roseum. Only Cristatum is listed as new cultivar from Asplenium nidus. Six new cultivars from Nephrolepis are N. biserrata Western King, N. cordidolia Ecuadorian Sword and Timmii, and N. exaltata Emerald Queen, Smithii, and True Massii. There are three new cultivars from Pteris; P. cretica Toddler, Wilsonii, and P. quadriaurita Parkerii. New cultivars of ferns are mainly derived through the isolation of sports from micropropagation.
Ficus is a genus of more than 800 species, and those used as foliage plants include F. altissima, F. benjamina, F. binnedijkii, F. elastica, F. lyrata, F. microcarpa, F. pumila, F. retusa, and F. rubiginosa. Historically, there were only one to three cultivars from each genus in 1970s. Now more cultivars are in the market due mainly to the isolation of sports. For example, F. benjamina Monique and Wiandi were sports of Ficus benjamina Exotica and Natasha respectively and selected by Huub van Diemer in Holland. F. benjamina Indigo and Midnight were sports of F. benjamina Exotica selected by Jan van Geest in Holland. These new cultivars were introduced to the US by Miami Agra-Starts, Inc., Homestead, Florida. Additional new Ficus cultivars include F. benjamina Midnight Princess and Too Little, F. binnendijkii Ali, Amstel King, and Sabre, and F. elastica Cabernet, Sylvie, and Melany. These new cultivars not only offer appealing aesthetic appearances, but also perform much better under interior low light conditions than F. benjamina Common (Chen et al. 2001c).
Hedera helix, commonly called English ivy, is the only Hedera species widely used as a foliage plant. Leaves in various sizes, shapes, colors, and patterns of variegation make it an important house plant. For the last hundred years, it has been used as a small potted plant for desks, coffee tables, plant stands, windowsills, and hanging baskets. There are more than 50 cultivars available in Florida; new cultivars include Adams Choice, Angel Snow, Bettina, Big Shot, Curly Locks, Fanfare, Francis, Hester, Jessica, Julia, Manda Crested, Manda Yellow, Nina, and Sara. Most of the cultivars were developed through selection of sports from propagation.
The Palm family includes over 200 genera (Huxley 1994). Species from Chamaedorea, Chrysalidocarpus, Howea, Phoenix, Rhapis, and Veitchia are used as foliage plants. Although Chamaedorea and Chrysalidocarpus are propagated through seeds, there is no active breeding program involved in genetic improvement of these plants. Therefore, the number of cultivars has not changed greatly since 1988.
Philodendron has two distinct phenotypes. The first is the vining type with heart-shape leaves, best represented by P. scandens. The second is the self-heading type, which include P. auriculatum, P. deflexum, P. bipinnatifidum, and P. selloum. From the 1950s to the early 1970s, P. sandens was the most popular foliage plant and dominated foliage plant sales. As consumers interest in P. scandens waned after the late 1970s, the percentage of Philodendron sales dramatically declined. In the last 20 years, a series of self-heading Philodendron hybrids with red, yellowish, or orange foliage have been released from R.H. McColleys traditional breeding program at Bamboo Nursery in Apopka, Florida. These include Autumn, Black Cardinal, Imperial Green, Imperial Red, Moonlight, Prince of Orange, Red Empress, and Red Emerald. The production of these plants has renewed interest in Philodendron.
Thirty-three species are recognized for Syngonium (Croat 1982), but only S. wendlandii is propagated through tissue culture for the Florida foliage plant industry in its native phenotype. The remaining plants are either hybrids or sports of hybrids (Henley and Robinson 1993). Many of the currently popular cultivars are selections from S. podophyllum or hybrids of the species. New cultivars include Berry Allusion, Bold Allusion, Julia Allusion, Mary Allusion, Bob Allusion, Pink Allusion, Key Lime, Regina Red, Cream, Holly M, and Neon, which are sports selected through tissue culture by Agri-Starts, Inc., in Apopka, Florida.
New plant introduction has been another important factor that incites the growth of the foliage plant industry in Florida. The genera listed below are becoming or will become important new players in the foliage plant industry. Some of these plants are obscure, some are well known but have been improved in new morphological forms, and others are collected from the wild. Those include Alocasia, Anthurium, Spathiphyllum, Zamioculcas, Calathea, Schefflera, bromeliads, and Phalaenopsis (Table 2).
Table 2. New foliage plants and selected cultivars in commercial plant production of Florida.
|Araceae||Alocasia||Black Stem, Corozon, Elaine, Fantacy, Frydek, Grandis, Loweii, Nobilis, Polly, White Knight, Wentii|
|Anthurium||Gemini, Kingston, Krypton, Lady Ruth, Lady Carmen, Nicoya, Pacora, Pura Vida Red, Red Hot, Showbiz, Smalltalk, Sundial, Tropic Fire, White Frost|
|Spathiphyllum||Hi Ho Silver, Alpha PPAF, Baby Face, Calipso PPAF, Ceres. Codys Color, Denver, Domino, Flower Power, Green Velvet, Leprachaun, Litter Angel, Mini, Sensation, Sierra, Silver Streak|
|Zamioculcas||Zamioculcas zamiifolia cv. ZZ|
|Araliaceae||Schefflera||Schefflera actinophylla cv. Connie Schefflera arboricola cv. Coveen, Covette, Emerald Green, Gold Capella, Goldfinger, Henrietta Luseane, Moose Foot, Nora, Renate, Trinette, Worthii|
|Bromeliaceae||Aechmea||Deleon, Eileen, Fia, Friederike, Fulgens, Ghost, Inca, Maya, Morgana, Superb|
|Cryptanthus||Elaine, Red Star, Yoshino|
|Guzmanala||Apache, Claret, Clementina, Conifera, Denise, Eloy, Empire, Gwendolyn, Hilda, Huron, Irene, Lance, Lipstick, Luna, Major, Mandarine|
|Neoregelia||Devro, Flandria, Martin, Perfecta, Piccillo, Raphael, Ultima, Victoria|
|Vriesea||Annie, Barbara, Charlotte, Christiane, Ella, Gigantea, Ginger. Isabel, Margot, Marleen, Poelmanii, Splendens, Tiffany|
|Liliaceae||Chlorophytum||Chlorophytum orchidantheroides cv. Fire Flash|
|Marantaceae||Calathea||Artic Blush, Helen, Corona, Cynthia, Ellipse, Loeneri, Maria, Medallion, Picta Royale, Rosy Roseo Picta, Tigrinum, Wilsons Princep, C. ecuadoriana Velvet touch, C. fasciata, C. majestica, C. orbifolia, C. ornata, C. roseopicta, C. rotundafolia, C. rufibarba, C. undulata, C. vittata|
|Orchidaceae||Phalaenopsis||P. aphrodite, P. schilleriana, P. cochlearis, and various hybrids: Crownfox Delicious, Crownfox Sugarloaf, Tai Plantation, Elaine Taylor, Glen Ridge|
Alocasia has not been considered an important foliage plant and was not included in a recent book Topical Foliage Plants: A Growers Guide (Griffith 1998). Now, cultivars with different colors, shapes, and sizes of leaves embellished with unique variegation patterns in 10-, 15-, 20-, and 35-cm (4", 6", 8", and 14") pots are available. In addition to A. amazonica, A. guttata, A. plumbea, A. odora, A. sanderiana, and A. sinuata, the cultivars listed in Table 2 are sports selected from tissue culture, primarily by Agri-Starts, Inc. Apopka, Florida.
Anthurium is a familiar genus but traditionally has been used for cut flowers. With the introduction of compact interspecific hybrids through breeding, a series of potted Anthurium cultivars have been released from the breeding programs of R.J. Henny at the University of Florida (Henny 1999; Henny and Norman 2001) and H. Kamemoto at the University of Hawaii (Kamemoto and Kuehnle 1996). Oglesby Nursery in Altha, Florida released the Lady series of dwarf cultivars that also contributed greatly to the potted Anthurium industry. Research has shown that Anthurium is a true interior-flowering foliage plant (Chen et al. 1999). Some cultivars are able to grow and flower continuously under interior conditions with 100 foot candles (16 mmol m-2 s-1) for three years (Chen et al. 2001b; Chen and Henny, unpubl. results). There is no doubt that Anthurium cultivars will soon be some of the most popular foliage plants.
Spathiphyllum is another flowering foliage plant genus and currently ranks among the top three plants in the Florida foliage industry. Its popularity is warranted because (1) its attractive dark-green leaves contrast dramatically with the showy-white inflorescences; (2) it can be induced to flower year-round through the application of gibberellic acid (Henny 1981); (3) it has diverse cultivars. In 1980, there were only six cultivars, but now more than 50 are available, which provides a large selection in pot and plant sizes. Examples of this diversity include Baby Face in 8-cm pots and Sensation in 43-cm pots to reach different market niches. Finished plants are widely used for interiorscaping. New cultivars are derived from traditional breeding as well as the selection of sports from tissue culture.
Zamioculcas has only one species: Z. zamiifolia (Brown 2000), commonly called as ZZ plant. It is a stemless herbaceous perennial, native to South Africa. Several stout fleshy stalks bearing alternate pinnate leaflets arise directly from thick horizontal rhizomes. It looks similar in shape to a cycad, thus it is sometimes known as the cardboard palm. In addition to its unique appearance, it has no apparent limiting insect or disease problems under interior conditions and is extremely tolerant to low light and drought. This plant grew slowly and maintained its aesthetic appearance during a four-month evaluation period under a light intensity of 4 mmol m-2 s-1 and no watering (J. Chen and R.J. Henny, unpubl. results). We believe that ZZ plants will become a popular addition to the foliage plant industry.
Calathea is a genus with about 100 species native to tropical regions of the Americas. In 1975 only 3 species, C. insignis, C. makoyana, and C. roseo-picta were commonly grown. Today 25 species and cultivars are listed in the FNGA Locator, 19992000. Most of these plants were developed from sports selected during tissue culture and are available from Agri-Starts, Inc. and Twyford Plant Laboratories, Inc.
Schefflera actinophylla was introduced to the foliage plant trade by Robert Scully Sr. of Hogshead Nurseries in Apopka, Florida. He was the first to grow it commercially from seeds. Seeds of S. arboricola were first imported by Ron Huroff of California in the late 1960s from Taiwan (Griffith 1998). The use of S. actinophylla and S. arboricola as small interior trees has elevated the genus Schefflera to the status of the second most important interior tree genus next to Ficus. This is because more than a dozen new cultivars were released mainly from the selection of sports. S. arboricola is umbrella-like in appearance, dwarf in habit, and freely branching. These cultivars offer different forms, styles, and sizes of plants with various variegation patterns of foliage.
Bromeliads were not listed in 1988 as a group of major foliage plants, however, they have increased to 5.1% of the total foliage plant wholesale value in 1998 (USDA 1999). The family Bromeliaceae has about 40 genera containing more than 2,000 species. Bromeliads grown as foliage plants mostly come from the genera Aechmea, Cryptanthus, Guzmanala, Neoregelia, Tillandsia, and Vriesea (Table 2). The recent rise of bromeliads as popular foliage plants is largely due to their exotic appearance, graceful symmetry, flamboyant bloom year round, low maintenance in production and in interior conditions, and diverse cultivar selection. It is estimated that there are several thousand hybrids developed through traditional breeding programs. Bromeliads will certainly become a dominant group of foliage plants.
Chlorophytum orchidantheroides Fire Flash was collected from Thailand but has not been described in Exotica or Tropica. The shape is similar to other members of the Chlorophytum genus, but it has wide, ovate lanceolate leaves and orange-pink (coral) midveins. The leaves are parallel veined and light, glossy green with a bright coral petiole. The flowers are white in a dense cylindrical panicle partially hidden by the foliage. The inflorescence does not add any value to the aesthetic appearance. In fact, it is detrimental. Removal of the inflorescence at an early stage of flowering improves plant growth (J. Chen and R.J. Henny, unpubl. results).
Phalaenopsis may not precisely fit the classical definition of a foliage plant. However, it is used primarily for interior decoration or interior plantscaping, because it has attractive flowers and is able to grow indoors. Traditionally, low light adapted orchids have been listed among house plants. Current interest in Phalaenopsis occurs because it is a fast-growing orchid in greenhouses, stays in bloom for more than four months, and flowers may last 4 to 5 weeks under interior conditions (Wang 1997). Phalaenopsis production has increased dramatically, with the national wholesale value increasing from $47 million in 1996 to $70 million in 1997 (USDA 1998, 1999). The wholesale value of orchids in Florida was $37 million in 2000, the majority consisting of Phalaenopsis. Most Phalaenopsis cultivars are hybrids imported as tissue cultured liners from Taiwan or South Korea.
As foliage plants are produced primarily for interior decoration or interior plantscaping, new end use will generate greater demand in production. New cultivar releases and new plant introductions provide products for new uses, and desire for novelty and new uses among consumers promote selection of new cultivars and introduction of new plants, which then increase production. This cycle helps explain why the foliage plant industry is one of the fastest growing segments of US agriculture.
The foliage plant industry has been enjoying steady growth with a wholesale value of $574 million in 2000, an all time high. The future of the industry is bright as foliage plants fulfil a psychological need, enhance our interior environment, and provide recreational opportunities. Recently, construction has increased and more foliage plants will be needed. Most importantly, the foliage plant industry has established a better system or communication between production and consumption. New plants and new cultivars generate more demand and new uses. New uses, in turn, require new cultivars and new plants to be produced.