culture and development of cold hardy camellia...camellia culture: soil •roots need both water and...
TRANSCRIPT
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Culture and Development of
Cold Hardy Camellia
Matt Taylor
Research Horticulturist
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Talk outline
• Longwood Gardens Camellia history
• Camellia culture
– Propagation
– Soil
– Planting in the North
• Camellia breeding at Longwood Gardens
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Longwood Gardens Camellia History
• Camellias from France were some of the first species planted upon completion of the Conservatory in 1921.
• Du Pont also desired large specimen camellias – He had a contact rural Georgia who
would locate well-shaped plants with good flowers and make an offer.
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Longwood Gardens Camellia History
• Camellia Inventory of 1937
– 372 plants representing 167 cultivars
• All were Japanese cultivars except for one C. reticulata
• 2011
– 229 Living accessions
• 12% - indoor display
• 29% - indoor – research greenhouses
• 59% - outdoor research plots
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Longwood Gardens Camellia History
• Dr. Russell J. Seibert was the first director of Longwood Gardens
• He initiated LWG’s research program, which included camellia trials and breeding
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First outdoor camellia trial - 1957
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First outdoor camellia trial - 1957
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Cold Hardiness Breeding • 1957 to the late 70’s
• Longwood collaborated with the U.S. National Arboretum and Dr. Clifford Parks at Descanso Gardens near LA.
• Parks did most of the hybridizing and hybrids were evaluated at Longwood and USNA. Two extremely cold winters (temps < -14 °F) in the late 70’s, killed most of the trial plants (Thomas, 1999).
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C × williamsii ‘Aida’ selected in 1974
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C × williamsii ‘Aida’ – Released 1995
× C. japonica 'Ville de Nantes' C. saluenensis 'Dogrose'
available at
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Cold Hardiness Trials • Reinvigorated by plant exploration to Sochong
Island, off the North West coast of South Korea (zone 6)
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Plant Exploration Trip
• US National Arboretum, Longwood Gardens, Morris Arboretum, Holden Arboretum and Korean institutions
– 28 collections of C. japonica seeds
– Cuttings from 20 well established trees
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C. japonica ‘Longwood Centennial’
Releases from Korea trip
Available at
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C. japonica ‘Longwood Valentine’
Releases from Korea trip
Both released in 2006 to
celebrate the 100th anniversary of du Pont’s
purchase of the property that is Longwood Gardens
Available at
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C. japonica ‘Korean Fire’
Releases from Korea trip
Released by Barry Yinger
Awarded the Gold Medal by the Pa Hort Society in 2003
Morris Arboretum is planning on releasing 4 more cultivars
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Camellia Propagation
• Cuttings
• Grafting
• Air layering
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Camellia Cuttings
• Should collect semi-hardwood cuttings
– Partially mature wood on current seasons growth
• Season: late summer
• Propagation system: mist, fog or humidly tent
• Cutting length: 3-6”
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Softwood
Semi-hardwood
Hardwood
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Humidity Tents
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The Jar Method
Geneve. 2009. University of Kentucky
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Wounding
• Callus and root formation is greater along the margins of the wound
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Auxin – Rooting Hormone
• Naturally occurring plant hormone that is used to stimulate adventitious rooting
• 2500 - 5000 ppm (0.25 - 0.5 %)
0.8 % IBA 0.1 % IBA 0.3 % IBA
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1 2
3 4 Beyl and Trigiano. Plant Propagation. 2008.
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Trimming leaves will reduce transpiration
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Grafting Camellias
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Grafting Terms
Scion - Piece of detached shoot with buds that comprise the upper portion of the graft from which the shoots of the new plant will arise.
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Rootstock/ Understock – Lower portion of a graft from which the roots are formed.
Could be seedling, cutting or root piece
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Late Winter/Early Spring – the time to graft
• Ideal situation
– Dormant scion
– Active root stock
• If possible place rootstock in warmer location (cold frame/sunroom) a few weeks prior to grafting.
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During grafting it is essential that the cambium of the scion and root stock are aligned
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Cleft/Wedge Grafts
• The tapered cut on the end of the scion is fit into the wedge shaped incision on the rootstock.
Geneve. 2009. University of Kentucky
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Cambium Rootstock
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Cleft/Wedge Grafts
• When the scion is smaller it is moved to once side to ensure cambial contact
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Air Layering
• Useful for propagating plants of relatively large size
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Steps for Air Layering
1. Girdle stem
2. Apply auxin/rooting hormone
3. Pack area with moist sphagnum or peat moss
4. Cover with polyethylene and tie at ends
5. Check the make sure moss remains moist
6. After roots are visible, rooted stem can be cut from mother plant and planted
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Master Gardeners of Jefferson County
University of Florida & Jefferson
County cooperative extension
1. Girdle Stem
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2. Apply auxin/rooting hormone
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3. Pack area with moist sphagnum or peat moss
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Master Gardeners of Jefferson County
University of Florida &
Jefferson County cooperative extension
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No Moss Showing
4. Cover with polyethylene and tie at ends
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Reflective foil or black plastic may be used to protect the rooting area
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Rewet if necessary
Master Gardeners of Jefferson County
University of Florida &
Jefferson County cooperative extension
5. Check to make sure moss remains moist
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6. After roots are visible,
rooted stem can be cut
from mother plant and planted
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Camellia Culture: Soil
• Roots need both water and air – Camellias prefer well drained soil
• Small substrate particles increase water holding capacity – Peat moss and clay
• Large substrate particles increase air porosity – Perlite and sand
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Large particles Small particles
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Large particles Small particles
Good aeration Low water holding capacity
Poor aeration High water holding capacity
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Blend of Small and Large particles
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Blend of Small and Large particles
Good aeration Moderate water holding capacity
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Soil amendments improve drainage
• Heavy clay soils will need amended
– Sand
– Perlite $$
– Gravel
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Soil pH • Slightly acidic: 5.5 – 6.5
• pH controls nutrient availability and high pH can cause deficiencies
• Conduct soil tests to determine if you have the appropriate pH
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• South Facing???
• Evergreen camellias transpire at higher rates on south facing sun exposed slopes
• Root systems cannot supply enough water during freezing temperatures and plants desiccate and die
Camellia Culture: Planting in the North
No
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Ideal Planting Area/Time
• North side of structure or hedge with protection from drying winds
• Ideal time of year is late winter/early spring to give the plant a growing season for establishment
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Size Matters
• At Longwood, we never plant anything that is less than 2-3’ in height
• Smaller plants are more susceptible to winter death
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Camellia Development at Longwood
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Stigma
Style
Ovary
Ovule
Pistil
♀
Anther
Filament Stamen
Petal
Sepal
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Emasculation
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Emasculation
• To remove the male parts of the flower to prevent self pollination during cross pollination.
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Camellia Breeding - Tag Your Flower
Paternal or Pollen Parent
Maternal or Seed Parent
x
Date
+
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Seed Viability Test
C. Azalea hybrid seed
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Seed Viability Test
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Seed Viability Test
Embryo Rescue
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Embryo Rescue
• Takes place in sterile tissue culture
• Provides optimal environment
– Light
– Water
– Fertilizer
– Sugar
– Insect free
– Disease free
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Floating Seed
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Somatic Embryogenesis
• Induced embryo formation from vegetative tissue
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Current and Future Work
• Continue to refine somatic embryogenesis process
• Determine effects of genetic variation
• Develop broader range of available camellias for zone 6 or maybe lower
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Acknowledgments
• Dr. Edwin Leinbach
• Louis Kasprzyk
• And many others
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Thank You! Questions
or Comments