Antirrhinum coulterianum - New Crop Summary & Recommendations
By Luke Howard
2012
Series: New Floricultural Crops: Formulation of Production Schedules for Wild, Non- domesticated Species
Part of the requirements for Horticultural Science 5051: Plant Production II University of Minnesota Floritech
Date: 04.30.2007
To: Grower Staff, Technical Staff, Sales Staff, and the President
From: Luke Howard, New Crops Specialist
RE: New Crop Summary and Recommendations
After completing a thorough review of the published taxonomic, popular press, seed/vegetative catalogs, scientific and trade literature, I have summarized the pertinent information for the following new crop. In addition, I have included my recommendations for the potential production schedule for this crop. Please follow my recommendation for the initial production trial.
Taxonomy
Scientific Name: Antirrhinum coulterianum Synonym: Sairocarpus coulterianus Common Names: white snapdragon, coulter’s snapdragon Family: Scrophulariaceae (Figwort family)
Geographic Distribution (5, 6)
North America U.S.A., Mexico California/Outer South Coast Ranges, Southwestern California (except Channel Islands), north west edge Sonoran Desert/ northern Baja peninsula (Mexico) Latitude Range: approximately 31 N to 36 N Altitude: 0-1700 m General Climatic Conditions: full sun to partial shade, highly drought tolerant, zone 11 (average minimum temperature above 40 degrees F) to zone 8a (average minimum temperature 10-15 degrees F) Tendency to naturalize or become invasive: No
Native Habitat (5, 6)
Well drained, loose soil in hot, dry, and open air conditions Grows among shrubs generally on burns, slopes, and in hilly areas
Taxonomic Description (5)
Annual, glabrous below inflorescence, hairy in inflorescence Stem: erect but weak (4’-6’ tall), often clings to other plants or debris Leaves: basal rosette often present (unique in genus)
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New Crop Research: Antirrhinum coulterianum
Inflorescence: raceme, terminal; pedicels 1–5 mm, lowest generally subtended by twining branchlets Flower: calyx lobes equal; corolla 9–12 mm, white to lavender; lower stamens generally exserted Flowering time: April to July Fruit: upper chamber indehiscent Among first growth following fire Chromosomes: n=15
Varieties/Cultivars on the Market
There are a number of Antirrhinum cultivars with similar and more desirable traits (overall hardiness, smaller plant size, and flower color) as those of Antirrhinum coulterianum available on the market.
Propagation methods
Seed propagated; Plugs to transplant: 6-7 weeks (3) Seed germination is stimulated by the presence of charred wood or aqueous extracts of it (2) Germination temperatures/duration: 70-75 degrees F for 7-10 days (3)
Product Specifications
The ideal phenotype would be a plant with healthy, full basal rosette leaves, a strong, thick stem, and full raceme of white flowers
Market Niche
Target Sales Date: April to July Holiday potential: No Programmability: This plant could most likely be forced year round Competition: Other cultivars of snapdragons Background/ “story”: California native plant, it’s trait as a fire follower may be a good story Major crop: No. There are many other cultivars of Snapdragons with much more desirable traits (overall hardiness, smaller plant size, flower color) Initial limitations/problems: Desire for dry, hot situation may make it difficult to grow with other crops Already identifiable to growers and consumers: Yes, in California. How soon could this product be available: Immediately
Anticipated Cultural Requirements (1, 3, 4)
Winter Hardiness: zone 11 (average minimum temperature above 40 degrees F) to zone 8a (average minimum temperature 10-15 degrees F) Heat/Drought Tolerant: Both Temperature (day/night): Day temperatures between 60-70 degrees F may influence flower initiation, but not development. Plants should be grown at night temperatures of 60-65 degrees F. Positive DIF maybe effective for cut flower production, 0 or negative DIF may be effective for bedding and potted plant production. Light Quantity, quality, duration: Facultative long day plant (18 hour day desirable); development and floral induction delayed if plants are grown under low light. Stage 1- light levels of 450-1500 fc, Stage 3 and beyond- light levels of 1000-2500 fc
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Nutrition: Nutrient application in young plants should not be neglected if quality plants with repeated flowering are desired. Nitrogen levels important at early ages for development of strong, thick stems. Snapdragons cultivars generally have relatively low nutrient requirements; 100-150 ppm N to harvest should suffice. Boron deficiency may cause problems, may become deficient if Calcium levels are too high. Soil: A well drained, fairly loose, aerated soil is desirable. Soil pH: 6.1 – 7.8 (6.1-6.5 optimal) PGRs: A variety of PGRs are known to be effective on snapdragon cultivars, including A-Rest, Bonzi, B-Nine, Cycocel, and Sumagic; i.e. A-Rest sprays used after transplanting (15- 20 ppm) and before finishing (15-26 ppm). 100 ppm GA3 may help increase stem length Container size : plugs – 288, finishing – 4” or 6” pots, spacing – 24” to 36” Disease: root degeneration and wilting related to poor aeration, excess watering, and Pythium. Botrytis, powdery mildew, downy mildew, and Pythium are some of the more common diseases Insects: aphids, fungus gnats, thrips, and red spider mites are most common in snapdragon cultivars Other: Plants should not be over watered. Temperature is important in the plant’s ability to absorb water; cooler temperatures inhibit absorbance. Plants may respond to 750-1500 ppm CO2
Production Schedule (1, 3, 4)
Stage 1(5-7 days): seed uncovered; 70-75 degrees F; pH 5.5-5.8; EC < 0.75; light levels of 450- 1500 fc Stage 2 (14 days): 65-70 degrees F; fertilizer of 50-75 ppm from calcium nitrate and potassium nitrate Stage 3 (14 days): 60-65 degrees F; fertilizer of 100-150 ppm N once a week and supplement with magnesium sulfate at 16 oz/100 gal., or magnesium nitrate. Maintain a ratio of 3:2:1, K:Ca:Mg. Light Levels of 1000-2500 fc Stage 4 (7-10 days): 60-62 degrees F, fertilize as needed, avoid ammonium Estimated number of days from planting to flower bud intiation: 60-70 days (9-10 weeks) Estimated number of days for flower development: 80-95 days (11-14 weeks) Estimated number of weeks from seed to finish: in the north, number of days from seed to finish ranges from 110 day in the summer to 160 in the early winter, with an average finish time of 135 days (approx. 20 weeks) Estimated type, quantity of special treatment applications: 2 A-Rest sprays, one used after transplanting (15-20 ppm) and one before finishing (15-26 ppm). Target sales date: April to July
Needs Assessment for Genetic Improvement
To make this crop more accessible and appealing to a market outside of its native area, improvement must be made in seed germination, overall plant hardiness, smaller plant size, and flower color
Literature Cited
1. Armitage, A. 2001. Armitage’s manual of annuals, biennials, and half-hardy perennials. 2. Baskin, Carol C.; Baskin, Jerry M. 2002. Propagation protocol for production of container Sairocarpus coulterianus (Benth. ex A. DC.) D.A. Sutton plants; University of Kentucky, Lexington, Kentucky. In: Native Plant Network. URL: http://www.nativeplantnetwork.org (accessed 29 April 2007). Moscow (ID): University of Idaho, College of Natural Resources, Forest Research Nursery. 3. Dole, J.M and H.F. Wilkins. 2005. Floriculture: Principles and species. 2nd Ed. Prentice Hall/Pearson. 4. Nau, J. 1999. Ball culture guide: The encyclopedia of seed germination. 3rd Ed.
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5. The UC Berkeley Jepson Herbarium. URL: http://ucjeps.berkeley.edu/cgi- bin/get_cpn.pl?Antirrhinum+coulterianum (accessed 29 April 2007). 6. The USDA Plants Database. URL: http://plants.usda.gov/java/nameSearch?keywordquery=antirrhinum+coulterianum&mode=sci name (accessed 29 April 2007). 7. Thompson, David M. c1988. Systematics of Antirrhinum (Scrophulariaceae) in the New World / David M. Thompson. Ann Arbor, Mich.: American Society of Plant Taxonomists. Systematic botany monographs, 0737-8211 ; v. 22.
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