RHS Year 1 week 14 2011

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Cuttings, division, layering

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RHS Year 1 week 14 2011

  1. 1. RHS Level 2 Certificate Week 14- vegetative reproduction by stem cuttings, layering and division.
  2. 2. Learning objectives <ul><li>Review of stem cuttings. </li></ul><ul><li>1.1 State the physiological factors to be fulfilled for successful propagation by layering. </li></ul><ul><li>1.2 Describe how to propagate ONE NAMED plant for EACH of the following types of layering: air; simple; and serpentine </li></ul><ul><li>1.3 Describe the aftercare required for plants raised by layering. </li></ul><ul><li>1.4 State the conditions which have to be met to ensure successful propagation by division. </li></ul><ul><li>1.5 Describe how to propagate by division ONE NAMED plant of EACH of the following types: a suckering shrub; a fibrous-rooted perennial; a perennial with distinct buds (eyes). </li></ul><ul><li>1.6 Describe the aftercare of plants propagated by division. </li></ul>
  3. 3. Stem cuttings <ul><li>Semi-ripe cuttings – leafy; taken when the new growth has started to turn woody. Need less heat than softwood. Rooting powder used. Shrubs. </li></ul><ul><li>Hardwood cuttings – taken whilst stock plant is dormant. Rooted outdoors or in cold frame. Plant the right way up! Trees </li></ul><ul><li>Root cuttings – taken when stock plant is dormant. Plant the right way up! Herbaceous perennials </li></ul><ul><li>Soft wood or soft tip cuttings – taken from new growth in spring. Very sensitive to dehydration so need humidity control, gently bottom heat often helpful. Some but not all need rooting powder. </li></ul>
  4. 4. Characteristics of plant material for propagation <ul><li>True to type – must show the characteristics you want. </li></ul><ul><li>Healthy – no signs of virus, no obvious or severe infestation or infection. </li></ul><ul><li>Turgid – must be well watered and protected from dehydration after removal from parent. </li></ul><ul><li>Juvenile – the more juvenile the material the better it is likely to root. </li></ul>
  5. 5. Propagation by division <ul><li>Used for perennials – clump forming, suckering and rhizomes. </li></ul><ul><li>Use more juvenile offsets from the edge of the clump or plant. </li></ul><ul><li>Divide summer flowering plants in the spring or autumn e.g, Iris ensata </li></ul><ul><li>Divide spring flowering plants in the summer after flowering e.g. Epimedium x rubrum </li></ul><ul><li>Aftercare – weed to reduce competition, do not allow soil to dry out. </li></ul>
  6. 6. Plants that can be divided <ul><li>Iris ensata (or any rhizomatous iris) </li></ul><ul><li>Epimedium x rubrum </li></ul><ul><li>Bergenia purpurescens </li></ul><ul><li>Hosta sieboldiana </li></ul><ul><li>Phyllostachys nigra </li></ul><ul><li>Sarcoccoa hookeriana </li></ul>
  7. 7. Propagation by layering <ul><li>Simple layering – advantages: can be used to propagate hard to root plants; needs little equipment; no hardening off </li></ul><ul><li>Disadvantages – produces relatively few plants and is slow. </li></ul>
  8. 8. Propagation by layering <ul><li>Serpentine layering -Used for woody climbers e.g, Lonicera . Produces several plants per stem however it needs quite a lot of space. </li></ul><ul><li>Air Layering – used for plants with rigid stems e.g. Magnolia grandiflora </li></ul>
  9. 9. Aftercare for layered plants <ul><li>Keep soil moist (sphagnum moss in air layering) until rooting occurs. </li></ul><ul><li>Once rooted (and shoots are produced in serpentine layering) detach from the parent plant and move to final position or into a pot to grow on. Remove any residual stem from the parent plant without leaving a snag. </li></ul>
  10. 10. Learning outcomes <ul><li>Review of stem cuttings. </li></ul><ul><li>1.1 State the physiological factors to be fulfilled for successful propagation by layering. </li></ul><ul><li>1.2 Describe how to propagate ONE NAMED plant for EACH of the following types of layering: air; simple; and serpentine </li></ul><ul><li>1.3 Describe the aftercare required for plants raised by layering. </li></ul><ul><li>1.4 State the conditions which have to be met to ensure successful propagation by division. </li></ul><ul><li>1.5 Describe how to propagate by division ONE NAMED plant of EACH of the following types: a suckering shrub; a fibrous-rooted perennial; a perennial with distinct buds (eyes). </li></ul><ul><li>1.6 Describe the aftercare of plants propagated by division. </li></ul>

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