Propagation - uaex.edu · Seed Propagation • primary method to propagate annuals & vegetables;...
Transcript of Propagation - uaex.edu · Seed Propagation • primary method to propagate annuals & vegetables;...
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Propagation
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This is NOT the focus of this talk!
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Plant propagation is as much an art as it is a science.
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Two Broad Categories of Plant Propagation:
Cuttings, grafting, budding,
tissue culture, layering,
division
Seed
• Asexual/vegetative:
• Sexual:
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Asexual propagation is basically the heart
and soul of horticulture.
‘Annabelle’
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Cutting Terminology:
1. Source of the cutting
2. Type/age of stem wood
a. leaf
b. stem
c. root
a. softwood
b. semi-hardwood
c. hardwood
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Leaf Cutting
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Root Cutting
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Root cuttings sprouting
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Stem Cuttings
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Types of cutting
• The terms ‘softwood’, ‘semi-hardwood’, and ‘hardwood’ are used to describe the relative amount of woody tissue in a stem.
• Softwood- 3-4 weeks
• Semi-hardwood 6-9 weeks
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Softwood Stem Cuttings
• Cuttings prepared from soft,
succulent, new spring growth of
deciduous or evergreen ‘woody’ etc.)
Generally root easily and faster, but
may require more attention (wilt easily)
• The term herbaceous cuttings is used for non-woody plants like geranium, coleus, chrysanthemum.
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Softwood Cuttings
• Softwood cuttings are soft, succulent, new growth of woody plants
• just as it begins to harden (mature). Shoots are ready when they can be snapped easily when bent
• For most woody plants, this stage occurs in May, June, or July.
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Softwood Cutting
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This Viburnum was stuck in a pure sand bed on
July 22, treated with rooting hormone, and rooted
by August 25!
Semi-hardwood Cutting
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Hardwood – dormant,
• wisteria,
• spirea,
• crape myrtle
• roses
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Hardwood Cutting
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Time of year to take cuttings?
*for broadleaf plants (dogwoods, forsythia
Viburnum, spirea) , in general, the best
time is following a spring flush
• for evergreen plants (spruce, junipers,
arborvitae) , in general, the best time is
after exposure to cold temperatures (late
fall/winter)
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Today, plant propagation is just like cooking.
Books and the internet are full of ‘recipes’ for
propagating plants by seed and cuttings.
These recipes are helpful in deciding when to
propagate and what is required.
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Given a preference, choose the terminal cutting
on the right that has not set a flower bud. IF all
shoots have flowers/flower buds, simply remove
prior to sticking cutting.
Best choice
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Rooting Media
• In general terms, we are want:
• sterile,
• well drained,
• and provides for adequate aeration.
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Rooting Media
• The most common components would be: coarse perlite, coarse vermiculite, peatmoss, or sand.
Vermiculite & Perlite
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perlite
peatmoss
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Favorite media recipes:
50% coarse perlite: 50% peatmoss
50% coarse perlite: 50% coarse
vermiculite
100% coarse perlite (well drained!)
100% sterilized, coarse sand
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pumice
OasisTM
perlite
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peatmoss
vermiculite perlite
Effect of media type on rooting
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J.Robbins 2002 -29
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Callus
• Callus is the white tissue that forms on cut surfaces of the cutting
• It is from callus that roots form.
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Typical relationship rooting to top growth
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Environmental Considerations
for Rooting
• Moisture
• Temperature
• Light
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Moisture - air
• Except for dormant cuttings, protect water loss from the leaves.
• Keep the atmosphere around the leaves near 100% humidity.
• Either trap moisture from the media or ‘mist’ the air.
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Moisture - media
. • Moist, but not too wet!
• A media that holds some moisture but provides for good aeration is ideal.
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Temperature
• For most cuttings, rooting media (65-75o F) than the air temp. (55-65o F).
• promote rooting in the media, but minimize stress on the leaves/stem
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Light
• While some sunlight is necessary
• too much can ‘burn’ the leaves.
• Keep cuttings out of direct light.
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Remember that until the stem
forms new roots it cannot
replace water lost through
leaves or stems. Low humidity
or high temperatures around
the cutting can accelerate the
water loss process—and stop
rooting.
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Mist is simply micro-droplets of water
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Many choices
Simply trapping soil moisture
Inverted tray for shade
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other options:
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Bottom heat:
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Transporting Cuttings
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Typical semi-hardwood terminal cutting
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Leaves removed to reduce water loss
Nodes (3 node cutting)
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Dip cutting in hormone talc
Base will be inserted
below media
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Stick cuttings
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Place in rooting chamber to elevate moisture
around cutting. Avoid direct sunlight.
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Air layering:
root the stem while
it is still attached to
the plant.
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Seed
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Seed Propagation
• primary method to propagate annuals & vegetables; some perennials
• Seed propagation is also used to propagate some woody trees and shrubs.
• Advantages include: – access to large numbers of propagules
– ease of harvest/storage.
• The primary limitation is that many plants do not come true from seed.
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Natural variability from seeds
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Similar to cutting propagation, there
are many very complete ‘recipe’ books
available. These books outline in
detail when to harvest the seed, how to
store the seed, how to sow the seed,
and post-germination issues.
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Collection/harvest of seed: • Consult books for time
and method for harvesting seed.
• In many cases, the pulp/flesh of certain fleshy fruits is removed before storage or sowing the seed.
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Scarification Scarification typically involves soaking the
seeds in concentrated acid or hot water, or, by
mechanical etching using a file or sand paper.
Use of the acid method is recommended only
for professionals !
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Scarification
• rub small seeds between layers of sand paper or use a file on larger seeds.
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Stratification • Stratification : Cool,
moist storage period.
• mimicking Mother Nature.
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Oak seed (acorns) in a stratification tray
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Seed Germination
• Again, consult ‘recipe’ books for specific requirements (light, temperature) for your type of seed.
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Covering seed. depth of planting, etc.
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Germination chamber
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Light requirements
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First true leaves
Cotyledons (‘seed leaves’); 2
cotyledons so a dicot
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Woody Plant example: Oakleaf Hydrangea
1 week 4 weeks
Harvest seed
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Asexual Propagation
• Grafting, budding, division
• Used to maintain traits of the parent plant.
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Dividing Perennials
• Divide spring bloomers in
the fall
• Divide fall bloomers in
the spring
• Summer bloomers can be
divided spring or fall.
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Division Form of vegetative propagation.
Common for daylilies, hosta, iris, etc.
Divide rhizome (‘fan’)
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Layering
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Grafting
• more expensive and
difficult
• commonly used in
the production of
most fruit and ornamental trees
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Grafted Trees
English Walnut Weeping Cherry
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Side-veneer grafting: Step #1
• Slice a vertical slit through the ‘bark’ of the rootstock.
• Across the top of that slit, make another short slice.
• Basically a ‘T’ cut.
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Side-veneer grafting: Step #2
Fold ‘bark’ back to form a pocket to receive scion
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Side-veneer grafting: Step #3
Prepare scion. In this case we are grafting a weeping tree (scion
wood) onto the rootstock of the same species that grows straight.
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Side-veneer grafting: Step #4
Prepare scion wood by slicing to form a flat faced point.
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Side-veneer grafting: Step #5
Insert scion into pocket in rootstock. Concerned about good fit.
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Side-veneer grafting: Step #6
Wrap union with grafting tape to hold pieces together until
union forms.
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Only time will tell