Rhs year 2 week 26 presentation
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  • 1. RHS Level 2 Certificate Year 2 Week 26 –Calcifuges, Roses, Climbers and Wall Shrubs
  • 2. Learning objectives
    • 3.5 Name FIVE lime-hating trees or shrubs.
    • 3.6 Name FIVE bush roses suitable for growing in a rose bed, including cluster-flowered (floribunda) and large-flowered (hybrid tea) examples.
    • 3.7 Name FIVE climbers and FIVE wall shrubs suitable for a variety of garden situations including shaded and north-facing.
    • 3.8 Describe the soil preparation and planting for roses, climbers and wall shrubs.
    • 3.9 Describe the routine maintenance for roses, climbers and wall shrubs, to include pruning and the control of weeds and common pests and diseases (aphids, powdery mildew, black spot of roses, canker, coral spot, honey fungus).
  • 3. Calcifuges – revision question answers
    • A plant that is intolerant of alkaline soil conditions (pH 7.5 to 8 or above, but some require much greater acidity e.g Rhododendron pH 5.5-4.5).
    • Iron deficiency leading to interveinal chlorosis, young leaves first.
    • Grow in a raised bed or container of ericaceous growing media, or add sulphur chips to the soil (short term, small area effect).
    • Camellia japonica ‘Elegans’
  • 4. Roses - selection
    • Personal preference – colour, flower form, single flowering or remontant?
    • Containerised or bare root?
    • Soil and aspect – roses prefer sun and well drained soil. Roses grafted onto R. canina stock will cope better with cold clay or sandy soils
    • Height and spread.
    • pH – roses prefer slightly acidic soil; modern bush roses will not grow well on alkaline soil.
  • 5. Roses – soil preparation
    • Improve the soil – add plenty of organic matter, double dig heavy clay. Permanent plants so need good soil.
    • Remove all weeds.
    • ‘Rose Sick’ soil – where roses have grown before plant pathogens build up. New roses unlikely to grow well so replace the soil around the rose with clean top soil.
    • Check pH – Old roses such as R. mundi better for alkaline soils.
  • 6. Planting bare root roses
    • Plant in autumn/winter provided soil not frozen or waterlogged.
    • Soak roots for an hour before planting.
    • Unlike most shrubs, plant the bud union about 2.5cm below the soil level.
    • Add compost and slow release fertilizer or bone meal to the planting hole and backfill.
    • Do not mulch until spring
    • Prune bush roses back hard (to 8cm) immediately after planting.
  • 7. Maintenance
    • Weeding – hand weed with care; damage to roots produces suckers.
    • Feeding – twice a year with proprietary rose feed. After pruning and then in mid-summer.
    • Watering – well watered until established then only in dry weather.
    • Mulching – 8-10cm of well rotted stable manure after pruning and feeding.
    • Hygiene – gather up and burn or bin all fallen leaves and debris.
  • 8. Pruning
    • Dead head for best floral display during summer.
    • Reduce by half in autumn to avoid wind rock.
    • Prune hard in late winter/early spring. Back to 20cm for large flowered roses and to 30cm for cluster flowered.
    • Flowers are borne on the current seasons growth. This has to be replaced each year so feeding is crucial to performance.
  • 9. Pests and diseases
    • Powdery mildew – hygiene; myclobutanil.
    • Rose Black spot – hygiene; myclobutanil or difenaconazole.
    • Aphids – fatty acid spray, pyrethrum or suitable systemic insecticide.
  • 10. Climbers and Wall Shrubs
    • Climbers are self supporting to some extent; wall shrubs need to be trained and supported.
    • Climbers climb using adaptations – such as adventitious roots; sucker pads; thorns; tendrils or twining leaf petioles or stems.
    • The extent of the adaptation influences how much support and training they need. E.g. Hedera helix needs no additional tying in.
  • 11. Planting
    • As for other shrubs except-
    • Rain shadow of walls and other supports – plant 40cm away and angle towards the wall; train with canes if necessary.
    • Clematis need to be planted 5cm deeper than the nursery level; protection from wilt.
    • Bare root budded climbing roses – bury the bud union by 2.5cm.
  • 12. Maintenance
    • Deadheading – where practicable.
    • Tie in new shoots to supports whilst young and pliable.
    • Feed annually with slow release fertilizer.
    • Water regularly until established and then in dry weather.
    • Mulch to conserve moisture and supress weeds.
  • 13. Pruning
    • Time – depends on flowering habit; this years wood or the previous year? Spring flowering climbers usually on previous years wood – pruned after flowering.
    • Summer flowering – usually on this years wood so pruned in late winter/early spring.
    • Some exceptions – so check encyclopaedia before pruning. Clematis and Wisteria require particular pruning approaches.
    • 4 ‘D’s’ apply; same techniques as for trees and shrubs.
  • 14. Learning outcomes
    • 3.5 Name FIVE lime-hating trees or shrubs.
    • 3.6 Name FIVE bush roses suitable for growing in a rose bed, including cluster-flowered (floribunda) and large-flowered (hybrid tea) examples.
    • 3.7 Name FIVE climbers and FIVE wall shrubs suitable for a variety of garden situations including shaded and north-facing.
    • 3.8 Describe the soil preparation and planting for roses, climbers and wall shrubs.
    • 3.9 Describe the routine maintenance for roses, climbers and wall shrubs, to include pruning and the control of weeds and common pests and diseases (aphids, powdery mildew, black spot of roses, canker, coral spot, honey fungus).