Rhs year 2 week 14

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  • 1. RHS Level 2 Certificate Week 14 – Prize Quiz and houseplants
  • 2. Learning objectives
    • 7. Understand the care of plants in an interior situation.
    • 7.1 Describe the environmental factors that must be taken into account when displaying plants inside domestic buildings.
    • 7.2 Describe the choice of suitable containers and growing media for houseplants.
    • 7.2 Describe the management of one fern ( Adiantum raddianum), one foliage ( Ficus benjamina) and three seasonal flowering plants ( Euphorbia pulcherrima, Kalanchoe blossfeldiana, and Saintpaulia ionantha) under the following headings: potting; feeding; watering; deadheading; re-potting; pest and disease identification and control.
  • 3. Prize Quiz
    • Twenty Questions – 30 minutes
    • Test conditions please
    • Three prizes
  • 4. Answers
    • 1. ( d) 2. (c) 3. (b) – because it warms up quickly in spring and has a loose texture for the carrots to grow into without forking. 4. (a) 5. (b) and (d) 6.(b) 7. (c) 8. Green Manure 9. Nitrogen – chlorophyll, green leafy growth; Phosphorous – essential for root growth; Potassium – essential for flowers and fruit; Calcium – essential for cell walls. 10. Foliar feed is sprayed onto the leaves. 11. Iron deficiency 12. (c) 13. (b) 14. (b) and (d)
    • 15. (d) 16. (d) 17. (b) 18. (c) 19. (b) 20. 46°C and five minutes
  • 5. Containers
    • Without the need to survive outdoor conditions the choice is endless.
    • Must have drainage holes though
    • Stand an ordinary plastic plant pot on a layer of gravel or leca if you have a planter without drainage holes
    • Could use a self watering container
    • Remember the rate of drying out of the growing media will be affected by the material chosen.
  • 6. Environmental factors indoors
    • Humidity – much drier than most plants prefer
    • Light – may be limited, or too much (as on a south facing window sill in summer)
    • Temperature – day to night fluctuations and maximum and minimum may not be ideal
    • Water – specific plants have specific requirements; but all need watering
  • 7. The Environment
    • Each plant’s needs will depend on where it originates – a jungle or a desert etc.
    • Light – most like bright but diffuse light; cacti are fine in direct sun.
    • Temperature – requirements vary, but large fluctuations are often a problem. Avoid draughts.
    • Humidity – needs vary; can be provided by misting; a gravel tray; grouping plants together.
  • 8. Feeding and watering
    • Liquid feed is best, as it gives control. Controlled release is good for large plants.
    • As a rule of thumb, feed fortnightly in spring and summer and monthly otherwise.
    • Use a general purpose feed unless a specialist one is available, e.g. for orchids.
    • Watering – needs vary, as a guide water only if the compost feels somewhat dry to the touch. Water hairy leaved and succulent plants from below.
  • 9. Routine Care
    • Remove any dead or diseased plant material immediately.
    • Dead head or remove spent flower stalks.
    • Treat pests and diseases as soon as seen.
    • Dust regularly – dust reduces photosynthesis.
    • Re-potting – not too often for flowering plants, every 2 years.
  • 10. Pests and diseases
    • Aphids, whitefly and other sap suckers – weaken the plant, spread virus and excrete honeydew. Use fatty acid spray or a suitable systemic insecticide designed for houseplants.
    • Downy Mildew – encouraged by cool, damp conditions. Remove affected parts and raise the temperature.
    • Powdery Mildew – avoid water stress; treat with suitable systemic fungicide.
    • Sooty Mould – grows on honeydew, so control sap suckers. Can be removed with a damp cloth.
  • 11. Addiantum raddianum
    • Jungle dweller
    • Moderate light, no direct sun
    • Moderate to high humidity – 60 to 80RH. Stand on a gravel tray or mist.
    • Warm conditions - 18°C or more
    • Avoid draughts as they will cause the leaves to go brown.
    • Feed fortnightly when growing.
  • 12. Ficus benjamina
    • A tree grown as a houseplant – they can outgrow their space, but take some time to do so.
    • Bright diffuse light, warmth and moderate to high humidity.
    • Water when dry and reduce watering in cool conditions.
    • Feed fortnightly when growing.
    • Susceptible to scale insects and mealybugs.
  • 13. Euphorbia pulcherrima
    • A Mexican shrub.
    • Likes bright light, warmth (no fluctuations) and moderate to high humidity. Keep out of draughts.
    • Feed monthly. Water when the surface of the compost is dry – do not overwater.
    • Will need 14 hours of dark for 6-8 weeks to initiate flower buds and colour the bracts.
    • Prone to whitefly
  • 14. Kalanchoe blossfeldiana
    • Strong sunlight is fine.
    • Low humidity and moderate to high temperature.
    • Feed every three weeks
    • Water when compost surface is dry.
    • Susceptible to aphid attack and to botrytis if the conditions are too humid or it is overwatered.
    • Needs 15 hour ‘nights’ for 30 days in September to bloom at Christmas.
  • 15. Saintpaulia ionantha
    • Good light, moderate warmth and moderate to high humidity.
    • Feed fortnightly in summer and spring with an African Violet feed. Lack of feeding leads to no flowers.
    • Water from below when the compost is just dry.
    • Flowers best if overcrowded so don’t repot too often.
    • Aphid, mealy bug, downy and powdery mildew.
  • 16. Learning outcomes
    • 7. Understand the care of plants in an interior situation.
    • 7.1 Describe the environmental factors that must be taken into account when displaying plants inside domestic buildings.
    • 7.2 Describe the choice of suitable containers and growing media for houseplants.
    • 7.2 Describe the management of one fern ( Adiantum raddianum), one foliage ( Ficus benjamina) and three seasonal flowering plants ( Euphorbia pulcherrima, Kalanchoe blossfeldiana, and Saintpaulia ionantha) under the following headings: potting; feeding; watering; deadheading; re-potting; pest and disease identification and control.
  • 17. Happy Christmas