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Colorado AgriScience Colorado AgriScience Plant Science Plant Science Unit 4: Reproduction & Genetics Unit 4: Reproduction & Genetics

Lesson 5: Asexual Propagation IILesson 5: Asexual Propagation II

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Layering Layering

In many plants stems will In many plants stems will develop roots in any area in develop roots in any area in contact with the medium while contact with the medium while still attached to the parent plantstill attached to the parent plant

AdvantagesAdvantages Plant doesn’t experience water Plant doesn’t experience water

stressstress Sufficient carbohydrates are Sufficient carbohydrates are

supplied to the developing plantsupplied to the developing plant

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Simple Layering Simple Layering

Common on:Common on: Azaleas, rhododendrons, & other Azaleas, rhododendrons, & other

plantsplants A stem is bent to the ground & A stem is bent to the ground &

covered with medium covered with medium Wound the bottom side of the Wound the bottom side of the

stem in the medium stem in the medium The last 6-10” of stem is left The last 6-10” of stem is left

exposedexposed

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Simple Layering Simple Layering

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Tip Layering Tip Layering

Common in Raspberries & Common in Raspberries & Blackberries Blackberries

Make a hole in the medium next to Make a hole in the medium next to the parent plantthe parent plant

Place the tip of a shoot in the hole & Place the tip of a shoot in the hole & cover itcover it

The tip will grow down & then upThe tip will grow down & then up Roots will form at the bendRoots will form at the bend When the new tip appears above the When the new tip appears above the

medium it is ready for transplanting medium it is ready for transplanting

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Tip Layering Tip Layering

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Air Layering Air Layering

Stem is girdled with 2 cuts 1” Stem is girdled with 2 cuts 1” apartapart

Remove barkRemove bark Dust wound with rooting Dust wound with rooting

hormone & surrounded in damp hormone & surrounded in damp sphagnum mosssphagnum moss

Wrap plastic around moss & tie Wrap plastic around moss & tie at both endsat both ends

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Air Layering Air Layering

In a few weeks roots will appear In a few weeks roots will appear throughout the mossthroughout the moss

Cut the stem just below the Cut the stem just below the newly formed root ballnewly formed root ball

Plant the ball into a well drained Plant the ball into a well drained potting medium potting medium

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Air Layering Air Layering

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Division Division

Some plants are easily Some plants are easily propagated by separating the propagated by separating the main part into smaller partsmain part into smaller parts

Plants with rooted crowns are Plants with rooted crowns are separated by cutting or pulling separated by cutting or pulling them apartthem apart

Plant the clumps separately Plant the clumps separately

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Division Division