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PROPAGATION
Sexual Recombination of genetic materials to
form a unique genetic individual
Asexual Use of vegetative organs to create
plantlets genetically identical to the parent plant
ASEXUAL PROPAGATION
Asexual Propagation
ADVANTAGES
Plants are uniform Quick establishment of plants Only means of propagation in certain
speices Seedborne diseases avoided Less expensive Heterozygous material may be
propageted without genetic alteration
DISADVANTAGES
Systemic viral infection can spread to all plants
Planting materials are bulky Storage of asexual material is
cumbersome and usually short term Genetically identical and thus subject to
the same hazards Mechanized propagation in some cases
not practical
ASEXUAL PROPAGATION
Divisions Cuttings Layers Grafting/budding Tissue Culture
DIVISION - SEPARATION
Remove loose soil
Remove dead leaves and stems
Note root system of plant Spreading Clumping Rhizome Tuber
SEPARATION
Spreading root systems Many slender roots from center of plant Plants can be invasive Cut with shears or pulled apart by hand Asters, bee balm, lamb’s ear, purple
coneflower, many common perennials
SEPARATION
Clumping root systems Many fleshy roots from crown of plant Can crowd own centers Keep one bud/eye with each division Astilbes, hostas, daylilies, orn. Grasses
SEPARATION
Rhizome division ‘Horizontal stems’, Primarily bearded
iris Divide after flowering through fall Cut and discard rhizome sections > 1
year Inspect for disease and insect
damage Cut back leaves to ‘fans’ Replant with top of rhizome above
soil level
SEPARATION
Tuberous roots Enlarged roots for storage Divide with sharp knife Each root must contain stem tissue
and bud Can be replanted or stored Dahlias
CUTTINGS
Vegetative plant part which is severed from the parent plant in order to regenerate itself, thereby forming a whole new plant
Leaves, stems, roots
CUTTINGS
Herbaceous: succulent, soft materials (green)
Softwood: soft, succulent growth of woody plants
Semi-Hardwood: partially mature wood of the current season’s growth Mid summer, leaves present
CUTTINGS
Hardwood: dormant, mature stems Taken before spring growth 6-12 inches Grapes, roses, honeysuckle
Conifer: Obtained in early spring Prefer cool and humid conditions Juniper, spruce
CUTTINGS: SHOOT
Axillary Bud
Terminal Bud
Stem
Leaf Adventitious Roots
CUTTINGS
Cane/Shoot Cutting Leaves Stems Buds
CUTTINGS: LEAF
Axillary Bud
Terminal Bud
Stem
Leaf
New bud
LEAF CUTTINGS
Full or partial leaf cuttings African violet, sansivieria
Leaf-vein cuttings Plantlets
Leaf-bud cuttings Rhododendron
Leaf Cutting Leaf only
CUTTINGS: LEAF-VEIN
CUTTINGS: HARDWOOD
CUTTINGS: HARDWOOD
Cut end of branch
Cambium exposed
LAYERING
Stems still attached to their parent plant may form roots where they touch a rooting medium
Severed from the parent plant, the rooted plant becomes a new plant
LAYERING METHODS
Tip Layer Simple Layer Compound Layer
Stooling Air Layer Stolons
AIR LAYER
Useful procedure on leggy plants
Wound stem and cover with moist medium to induce rooting