LA Landscape common mistakes
LA Landscape · Understand the traps and how to avoid them.
Treating the grading exam as a math test: computing spot elevations and slope percentages correctly but never checking that the resulting contours close, that drainage leaves the site, or that the proposed surface ties into existing grades at the property line.
Candidates drill slope formulas and interpolation until the arithmetic is automatic, then under time pressure stop doing the synthesis step. The calculations look right in isolation, so the error is invisible unless you step back and read the plan as a whole.
What to do instead
After every calculation, do a 30-second contour read: trace each proposed contour to see where it closes, confirm no contour dead-ends, verify high points and low points are intentional, and check that the perimeter ties to existing grade. Practice by redrawing finished solutions as contour sketches rather than number sets.
Designing stormwater conveyance with pipe or swale capacity alone, omitting the required storage volume, the treatment train, and the downstream discharge point, so the answer is hydraulically plausible but fails the stormwater management standard.
Detention, retention, and water-quality volume requirements are usually taught as separate topics from pipe sizing, and candidates default to the calculation they practiced most. The exam often asks for the whole system, not one component.
What to do instead
Build a one-page checklist for any drainage question: peak flow, required storage, release rate, treatment mechanism, overflow path, and point of discharge. Run every practice problem through all six items before selecting an answer.
Answering code and regulation items from memory of a general building code or local habit instead of from the specific accessibility, zoning, or life-safety requirement the question invokes, including missing dimensional clearances on walks, ramps, and parking.
Candidates with field experience trust familiar rules of thumb, and codes are revised on cycles, so remembered numbers drift. Accessibility dimensions in particular are easy to misremember by a few inches.
What to do instead
Maintain a personal one-page dimensional sheet for the accessibility and zoning values that appear repeatedly (walk width, cross slope, ramp landing, accessible stall count, sign height) and rebuild it from the actual code text, not from memory, during study.
Confusing the purpose of each construction document set: putting performance specifications where prescriptive ones belong, mixing general conditions with supplementary conditions, or failing to distinguish a detail from a section from a schedule.
The documents are produced together and share vocabulary, so candidates learn the words without learning the boundaries. Exam items exploit those boundaries directly.
What to do instead
Create a matrix of document types against their function, author, and binding effect, and for each practice item name the document type before answering. If you cannot name the type, you do not yet know the content.
Reading a soil or vegetation question as a single-variable problem, choosing a plant or amendment based on one favorable trait while ignoring drainage class, pH, salinity, compaction, or the rooting volume actually available.
Plant lists and soil amendments are memorized as attributes rather than as constraints, and exam stems often bury the limiting factor in a subordinate clause.
What to do instead
Before answering, list every site constraint stated in the stem and eliminate any option that violates even one. Practice by writing the limiting factor in the margin for each item, then checking whether your chosen answer respects it.
Specifying materials and details by name and appearance without verifying the installation sequence, substrate, movement accommodation, or edge condition, so the detail cannot actually be built as drawn.
Candidates study product families and finishes because those are visual and memorable, while jointing, fastening, and tolerances are learned only on site. The exam tests the buildability, not the catalog photo.
What to do instead
For each assembly you study, draw the section by hand and label every layer, fastener, and joint. If a layer has no structural or functional reason to be there, you have found a gap in your understanding.
Skipping the inventory and analysis step in site planning items: jumping to a proposed layout before establishing opportunities and constraints, then defending a scheme that conflicts with a stated site condition.
Designers are trained to generate solutions quickly, and multiple-choice stems reward the first plausible layout. The analysis is often implicit in the stem and easy to overlook.
What to do instead
Force a two-pass method on every site planning question: first list constraints from the stem, then evaluate options against that list. Do not look at the answer choices until the constraint list is written.
Misreading the question's subject in professional practice items, answering about the contractor's obligation, the owner's obligation, or the landscape architect's standard of care interchangeably, and missing the sequence of communications in a dispute.
The roles share overlapping duties and the stems are written to sound neutral. Candidates answer the question they expected rather than the one asked.
What to do instead
Underline who is being asked about and what phase the project is in before reading the options. Learn the standard sequence for submittals, requests for information, change orders, and payment certification as a timeline you can recite.
Treating environmental and cultural resource review as a formality: proposing work in a floodplain, wetland buffer, or identified cultural landscape without the permit, mitigation, or consultation path the resource requires.
Resource topics are studied as background reading rather than as decision rules, so candidates recognize the resource but not the procedural consequence.
What to do instead
For each resource type, memorize the trigger, the reviewing authority, and the required document. Convert that into a three-column table and test yourself by naming the authority from the resource alone.
Writing or interpreting communication items as generic good practice, choosing the answer that sounds most professional rather than the one that matches the contractual instrument, audience, and required content of the record.
Soft-skill language in the stems invites intuition, and candidates have read enough advice to recognize a pleasant-sounding option. The scored answer is usually the one that preserves the record and the contractual chain.
What to do instead
Judge each option by three tests: does it create a durable written record, does it go to the correct party, and does it stay within the author's authority. Reject any option that fails one of the three, however agreeable it sounds.