Horticulture and the Environment: Sustainability and Safety
Core concepts
Understand sustainability in horticulture: conserving water, soil and energy; reducing waste; composting; using renewable materials; and protecting biodiversity. Learn water-saving methods such as mulching, drip irrigation and rainwater harvesting. Know the value of peat alternatives, recycling pots and green waste, and encouraging pollinators and natural enemies.
Safety is essential. Understand safe use, storage and disposal of pesticides and fertilisers, following the label. Learn personal protective equipment, safe lifting, tool safety and first aid basics. Know risks from machinery, electricity near water, and sun exposure.
Traps in questions
A common trap is assuming organic means safe; organic pesticides still need care and correct dose. Another is disposing of pesticide waste down drains, which causes pollution. Candidates also forget that mulching saves water and suppresses weeds at the same time.
Worked example
A gardener wants to reduce water use. Mulch beds, use drip irrigation, harvest rainwater and group plants by water need. Rule of thumb: read the label, wear the protective equipment specified, and never exceed the stated dose.
Practical Horticultural Skills and Investigative Work
Core concepts
Practical skills include soil preparation, sowing, planting, watering, pruning, propagation, harvesting and tool care. Investigative work requires clear aims, a hypothesis, controlled variables, fair testing, accurate measurement, recording results in tables, and drawing conclusions.
Understand the difference between independent, dependent and controlled variables. Learn to present data in tables and graphs, calculate means, and identify anomalies. Know that reliability improves with repeats, and that a conclusion must be based on evidence, not opinion.
Traps in questions
A frequent trap is changing more than one variable, making results invalid. Another is confusing the dependent variable with the controlled variables. Candidates also forget to record units and to repeat measurements.
Worked example
To test whether mulch reduces watering, keep plant type, soil and pot size the same (controlled), vary mulch presence (independent), and measure water needed or soil moisture (dependent), repeating each treatment. Rule of thumb: change one thing, measure one thing, keep the rest the same.