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RHS Level 2 Year 2 week 28 presentation
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RHS Level 2 Year 2 week 28 presentation

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  • 1. RHS Level 2 Certificate Week 28: Alpines and Water Gardening.
  • 2. Learning Objectives
    • 4. Understand the choice of alpine and rock garden plants and how to grow them
    • 4.1 Name FIVE alpine or rock garden plants for spring display and FIVE for summer display.
    • 4.2 Describe soil characteristics, soil preparation and routine maintenance for the display of alpine or rock garden plants in open soil.
    • 4.3 Describe choice of container, the characteristics and preparation of the growing medium, and the routine maintenance required for an alpine or rock garden display in containers.
    • 5. Understand the planting and maintenance of a garden pool.
    • 5.1 Name TWO AQUATIC plants from each of the following groups: floating, deep-water, marginal and bog plants.
    • 5.2 Describe the planting and establishment of aquatic plants in a garden pool.
    • 5.3 Describe the annual maintenance of a garden pool, including possible controls for algae including blanket weed.
  • 3. Alpine Plant Adaptations
    • Low nutrients – slow growing, evergreen.
    • Low moisture – small leaves, hairy leaves (to create microclimate), silver leaves (to lower surface leaf temperature); CAM photosynthesis.
    • Low humidity in summer - small leaves, hairy leaves (to create microclimate), silver leaves (to lower surface leaf temperature).
    • High winds – very short, woody or dense growth; mat forming or creeping.
    • Bright sunlight – hairy leaves create shade for leaf surface.
  • 4. Edelweiss – Leontopodium album
  • 5. Reflexed Stonecrop – Sedum rupestre ‘Blue Cedar’
  • 6. Growing in the Garden
    • Alpine house – a ‘greenhouse’ with all the doors and vents open unless it’s raining in. Keeps specialist plants suitably dry, impractical for most people.
    • Rock Garden or Scree Bed – hard to achieve a natural look on a small scale; offers right conditions for many plants.
    • Trough – can be raised so plants easily seen; easier to protect from wet in winter. Suits small gardens.
  • 7. Rock Garden – preparation and planting
    • Remove weeds on sunny, sloping site
    • Excavate area to 30cm and add 15cm hard core and stones; top with inverted turf.
    • Use only ordinary mineral top soil and grit; no nutrients added.
    • Bed stones into ground by 1/3 then build up soil around and above them, adding stones irregularly.
    • Plant after 1 or 2 weeks; use free draining planting mixture. Water in and top dress with stones.
  • 8. Trough – preparation and planting
    • Stone, reconstituted stone, plastic or hypertufa
    • Drainage holes vital; add layer of stones and one of grit.
    • Use loam based seed compost with added grit or proprietary alpine compost
    • Bed narrow rocks on edge to plant between
    • Plant into compost and water in
    • Top dress with stones (same type as the rocks)
  • 9. After care
    • Watering – until established but only in dry spells
    • Weeding – careful and regular hand weeding
    • Trimming and pruning
    • Winter protection – use open ended cloche, propped up piece of glass or cold frame light.
    • Feeding – not generally needed
    • Pests and diseases – slugs and snails on new shoots, aphids on sappy growth. Rot if they get too wet at the roots or neck in winter.
  • 10. Water Gardening
    • Formal pools – regular shape, often raised, ornamental planting often limited to one species e.g. Nymphea alba
    • Informal pools – designed and planted to mimic nature whilst being ornamental.
    • Bog gardens – areas of permanently wet ground for plants that need wet feet to thrive. Good for drainage of wet gardens – turn a problem into a feature. Use around informal pools to soften edges.
  • 11. Planting
    • Leave for at least a week after filling – plant in full growth.
    • Marginals and deep water plants into baskets with aquatic growing media topped with stones.
    • Oxygenators may need planting into a basket or bag, some do not grow anchoring roots.
    • Floating plants are floated onto the surface; they may anchor themselves and hibernate as a tuber ( Trapa natans ) or sink below the water in winter.
    • Deep water plants need to be moved gradually to full depth as they grow
  • 12. Maintenance
    • Algae control – keep nitrates down; keep water pH neutral; remove algae; add barley straw or extract; filters for ponds with fish.
    • Dividing plants to keep size under control – every 2 years. Part remove oxygenators and floating plants gradually if they get too vigorous.
    • Cleaning – every 3-4 years if organics are removed regularly. Remove autumn leaves as they fall.
    • Winter – football to stop the pond icing over fully.
  • 13. Learning outcomes
    • 4. Understand the choice of alpine and rock garden plants and how to grow them
    • 4.1 Name FIVE alpine or rock garden plants for spring display and FIVE for summer display.
    • 4.2 Describe soil characteristics, soil preparation and routine maintenance for the display of alpine or rock garden plants in open soil.
    • 4.3 Describe choice of container, the characteristics and preparation of the growing medium, and the routine maintenance required for an alpine or rock garden display in containers.
    • 5. Understand the planting and maintenance of a garden pool.
    • 5.1 Name TWO AQUATIC plants from each of the following groups: floating, deep-water, marginal and bog plants.
    • 5.2 Describe the planting and establishment of aquatic plants in a garden pool.
    • 5.3 Describe the annual maintenance of a garden pool, including possible controls for algae including blanket weed .