Understand and Carry Out Identification, Planting and Care of Trees — City & Guilds Limited Occupational Qualification Horticulture & Land Management Revision
This element covers the comprehensive skills and knowledge required for the successful selection, siting, planting, and long-term care of trees and shrubs
Topic Synopsis
This element covers the comprehensive skills and knowledge required for the successful selection, siting, planting, and long-term care of trees and shrubs in horticultural settings. It integrates plant identification, site assessment, and practical establishment techniques with ongoing maintenance strategies such as staking, watering, mulching, and pest management. Mastery ensures plants thrive, meet landscape design objectives, and comply with health and safety and environmental standards.
Key Concepts & Core Principles
- Plant taxonomy and identification: Understanding botanical nomenclature and key characteristics of major plant families, including scientific naming conventions and use of dichotomous keys.
- Soil science and plant nutrition: Knowledge of soil types, pH, organic matter, and nutrient cycles; ability to interpret soil analysis and recommend appropriate amendments.
- Integrated pest management (IPM): Strategies for monitoring, preventing, and controlling pests and diseases using biological, cultural, and chemical methods with minimal environmental impact.
- Propagation techniques: Mastery of sexual (seed) and asexual (cuttings, grafting, division) propagation methods, including environmental control and aftercare.
- Sustainable landscape management: Principles of water conservation, composting, mulching, and use of native plants to create resilient and low-maintenance landscapes.
Exam Tips & Revision Strategies
- For identification tasks, create a photographic portfolio of trees and shrubs in leaf, flower, and winter silhouette, with labelled diagnostic features; this can be used as evidence and aids memory.
- In a planting practical assessment, narrate your actions as you work, justifying why you are, for example, not amending the backfill soil or why you've positioned the graft union above soil level, to demonstrate underpinning knowledge.
- When responding to aftercare questions, structure answers around the key establishment risks (water stress, weed competition, physical damage) and describe timed interventions (weekly watering, annual mulch top-up) rather than generic statements.
Common Misconceptions & Mistakes to Avoid
- Misidentifying trees and shrubs by relying solely on flowers, which may not be present at the time of assessment, rather than using a combination of vegetative characteristics.
- Failing to check soil drainage before planting, leading to waterlogging or drought stress, and not considering the mature size of the tree when positioning near structures or services.
- Planting bare-root stock with roots exposed to drying winds, or not firming soil sufficiently to eliminate air pockets but over-compacting, which restricts root growth.
- Applying excessive mulch in a 'volcano' mound against the stem, causing collar rot, or using stakes that rub and damage the bark, or leaving ties on too long.
Examiner Marking Points
- Award credit for correctly identifying a minimum of 10 trees and shrubs by both common and botanical names, with accurate reference to key morphological features such as leaf shape, bark texture, and seasonal characteristics.
- Assess for a thorough site appraisal that includes soil type, pH, drainage, aspect, wind exposure, and existing vegetation, with clear justification of species choice based on site limitations and design intent.
- Check planting demonstration for correct pit size, root preparation (e.g., teasing out container-grown roots), backfilling techniques, and avoidance of planting too deep or too shallow, with consideration for the tree's natural root flare.
- Look for evidence of an appropriate aftercare plan covering watering regime during establishment, mulching depth and material, stake and tie selection (if needed), and formative pruning guidance for the first two years.
- Evaluate understanding of biosecurity and sustainability principles, such as sourcing disease-free stock, using peat-free composts, and selecting native species to support local ecosystems.