MS Landscape common mistakes
MS Landscape · Understand the traps and how to avoid them.
When a client asks for a low-water planting plan, answering with a list of drought-tolerant species only, without first establishing hydrozones, exposure, soil drainage, or the irrigation strategy the plant list must fit into.
Candidates treat 'plant selection' as a naming exercise and jump to familiar species before completing the site analysis and water-budget steps that the exam frames as the front end of the design process.
What to do instead
Practise writing a one-page site and water brief before any plant list: map hydrozones, note sun and wind exposure, soil texture and drainage, and the planned irrigation type. Then select species that match each zone, and be ready to justify every choice against those constraints rather than against habit.
Choosing plants by mature height and spread alone, ignoring mature canopy width relative to overhead lines, foundations, and the ultimate size of the root zone.
Catalogues and nursery tags foreground height, and candidates under time pressure pick the number that is easiest to compare, forgetting that spread and root spread drive the spacing and clearance decisions the exam tests.
What to do instead
For every tree or large shrub in a practice plan, record height, spread, root habit, and required clearance, then check the planting distance against the structure or utility. Build a short personal table of the ten species you use most so the mature dimensions are memorised, not looked up.
Treating a grading or drainage question as a formula lookup and computing a slope or volume without first stating the design intent, such as directing surface water away from the structure or meeting a minimum fall.
Quantitative items reward calculation, so candidates rush to the arithmetic and skip the qualitative step of deciding which way water should go and what constraint governs the answer.
What to do instead
Answer in two steps every time: state the drainage objective and governing constraint in one sentence, then calculate. Check the result against a sanity threshold, for example whether the proposed fall is enough to move water without causing erosion, before selecting an option.
Specifying a hardscape material or assembly by product name without stating the base build-up, bedding, jointing, and edge restraint that make it perform.
Product knowledge is memorable and feels like the substance of the answer, while base and edge details are learned as background and are harder to recall under exam pressure.
What to do instead
For each common assembly, such as unit paving, timber decking, or a retaining wall, write the full build-up from subgrade to surface as a single sequence. In any materials question, look first for the option that names the correct base and restraint, not the most attractive finish.
Answering a retaining wall question by checking only the wall height against a rule of thumb, without considering surcharge, drainage behind the wall, soil type, or foundation depth.
Height-based rules are widely repeated and easy to remember, so candidates apply them as a shortcut and miss that the exam is testing the conditions that change the structural demand.
What to do instead
Treat every wall as a system: height, soil and water pressure, drainage layer and outlets, foundation bearing, and any surcharge load. Practise identifying which of these a question is really probing, and remember that drainage detail is usually the deciding factor.
Writing a maintenance schedule that lists tasks by season but omits frequency, trigger conditions, and the standard of work expected.
Candidates recall the calendar of horticultural tasks and stop there, not realising that a specification needs measurable triggers and acceptance criteria to be enforceable.
What to do instead
Convert each task into a specification line: what is done, when or on what trigger, how often, and what 'done' looks like. For example, specify mowing height and frequency by growth rate, and hedge trimming by growth increment rather than by month alone.
Confusing irrigation application rate with precipitation rate, or sizing a zone from pipe diameter alone without checking pressure, flow, and matched precipitation across heads.
The terms sound interchangeable and the formulas are often memorised separately from the field logic, so candidates plug numbers into the wrong relationship.
What to do instead
Learn the definitions side by side and practise a full zone design: available pressure and flow, head spacing, precipitation rate, and whether heads on the same zone apply water at a matched rate. Always check that the answer respects the supply limit, not just the area to be covered.
Designing an irrigation schedule that ignores soil infiltration rate, plant establishment stage, and local water restrictions, and instead applies a fixed runtime all season.
Fixed schedules are the default in the field and are easy to reproduce, so candidates carry that habit into questions that are specifically testing adaptive scheduling.
What to do instead
Answer scheduling questions with a water-balance approach: evapotranspiration demand, effective rainfall, soil water-holding capacity, and allowable depletion, adjusted for new plantings. State how the schedule changes across the season and how it complies with any restriction mentioned.
Producing a cost estimate that covers plants and paving but omits preliminaries, contingency, allowances, and the difference between a quote and a tender.
Candidates build estimates from the visible line items they can picture, and the commercial framing around them is learned late or not at all.
What to do instead
Use a fixed estimate skeleton every time: preliminaries, site setup, measured works by trade, allowances for unknowns, contingency, overheads and margin, then tax. Label the document as an estimate, quote, or tender and note what is excluded.
Answering a project management scenario by naming a document, such as a variation order or a programme, without describing the sequence of actions that manages the risk.
Scenario questions look like recall items, so candidates supply the label and move on, missing that the marks sit in the process and the communication steps.
What to do instead
For each scenario, write the response as a short sequence: identify the issue, notify the client in writing within the contractual time, document the change with cost and time impact, obtain written instruction, then update the programme and records. Practise this template until the sequence is automatic.