Illinois Landscape Architect Examination
Advanced 100-Question Practice Exam
2026 | Questions & Answers with
Detailed Rationales | Complete Exam
Prep & Study Guide
1. Which site-analysis process best establishes the relationship between
existing site conditions and a proposed landscape architectural program?
A. Conceptual rendering only
B. Inventory, analysis, synthesis, and evaluation
C. Planting-plan preparation followed by grading
D. Cost estimating followed by programming
Answer: B. Inventory, analysis, synthesis, and evaluation
Rationale: A comprehensive site-analysis process begins by documenting
existing conditions, analyzing their interactions and constraints, synthesizing
opportunities and limitations, and evaluating alternatives before final design
decisions are made.
, 2. On a steep Illinois site, which grading strategy most effectively reduces
concentrated stormwater flow and erosion?
A. Directing all runoff toward one swale
B. Increasing pavement slopes
C. Using distributed drainage, terraces, and stabilized conveyance systems
D. Eliminating all contour changes
Answer: C. Using distributed drainage, terraces, and stabilized conveyance
systems
Rationale: Distributed drainage reduces flow concentration and velocity.
Terracing, level spreaders, vegetated swales, check structures, and stabilized
channels can collectively reduce erosion and improve stormwater management.
3. A landscape architect is evaluating a site with poorly drained clay soil.
Which improvement is generally most appropriate for establishing
landscape vegetation?
A. Compacting the soil further
B. Improving soil structure and providing appropriate drainage
C. Increasing irrigation frequency without changing soil conditions
D. Covering the entire site with impermeable pavement
Answer: B. Improving soil structure and providing appropriate drainage
Rationale: Heavy clay can restrict infiltration, aeration, and root development.
Appropriate soil amendments, decompaction, drainage design, and careful
grading can improve growing conditions.
4. Which factor is most important when determining the suitability of a
proposed tree location adjacent to a building?
A. Tree color
B. Mature canopy and root-zone characteristics
C. Availability of annual flowers nearby
D. Temporary construction appearance
,Answer: B. Mature canopy and root-zone characteristics
Rationale: Tree placement must account for mature canopy spread, root
development, utilities, structures, solar exposure, maintenance access, and
potential conflicts.
5. What is the primary purpose of a landscape architectural site inventory?
A. To establish final construction costs
B. To document existing physical, environmental, cultural, and regulatory
conditions
C. To select every plant before design begins
D. To produce the final construction documents
Answer: B. To document existing physical, environmental, cultural, and
regulatory conditions
Rationale: Inventory establishes the factual foundation for subsequent analysis
and design. It should document natural and constructed features as well as
relevant regulatory and contextual conditions.
6. Which grading method is most appropriate for verifying whether a
proposed accessible route meets required slope criteria?
A. Visual inspection only
B. Spot elevations and calculated slopes
C. Planting-plan review
D. Soil texture analysis
Answer: B. Spot elevations and calculated slopes
Rationale: Accessible routes require measurable slopes and cross slopes. Spot
elevations allow the designer and reviewer to calculate and verify compliance.
7. A proposed walkway has an elevation change of 3 feet over a horizontal
distance of 60 feet. What is the approximate running slope?
, A. 2%
B. 5%
C. 10%
D. 20%
Answer: B. 5%
Rationale: Slope percentage equals rise divided by run multiplied by 100. Three
divided by 60 equals 0.05, or 5%.
8. Which soil property most directly affects the amount of water available for
plant uptake?
A. Soil color alone
B. Texture, structure, and organic matter
C. Surface temperature alone
D. Rock color
Answer: B. Texture, structure, and organic matter
Rationale: Soil texture and structure influence pore-size distribution, drainage,
aeration, and water-holding capacity. Organic matter can improve aggregation
and available water in many soils.
9. When locating a large deciduous shade tree on the south side of a building,
which factor deserves particular consideration?
A. Winter sun obstruction
B. Potential summer shade and winter solar access
C. Flower color only
D. Lawn mowing frequency only
Answer: B. Potential summer shade and winter solar access
Rationale: Deciduous trees can provide useful summer shading while allowing
greater winter solar penetration. Their mature size and location should be
evaluated in relation to building energy performance.
Advanced 100-Question Practice Exam
2026 | Questions & Answers with
Detailed Rationales | Complete Exam
Prep & Study Guide
1. Which site-analysis process best establishes the relationship between
existing site conditions and a proposed landscape architectural program?
A. Conceptual rendering only
B. Inventory, analysis, synthesis, and evaluation
C. Planting-plan preparation followed by grading
D. Cost estimating followed by programming
Answer: B. Inventory, analysis, synthesis, and evaluation
Rationale: A comprehensive site-analysis process begins by documenting
existing conditions, analyzing their interactions and constraints, synthesizing
opportunities and limitations, and evaluating alternatives before final design
decisions are made.
, 2. On a steep Illinois site, which grading strategy most effectively reduces
concentrated stormwater flow and erosion?
A. Directing all runoff toward one swale
B. Increasing pavement slopes
C. Using distributed drainage, terraces, and stabilized conveyance systems
D. Eliminating all contour changes
Answer: C. Using distributed drainage, terraces, and stabilized conveyance
systems
Rationale: Distributed drainage reduces flow concentration and velocity.
Terracing, level spreaders, vegetated swales, check structures, and stabilized
channels can collectively reduce erosion and improve stormwater management.
3. A landscape architect is evaluating a site with poorly drained clay soil.
Which improvement is generally most appropriate for establishing
landscape vegetation?
A. Compacting the soil further
B. Improving soil structure and providing appropriate drainage
C. Increasing irrigation frequency without changing soil conditions
D. Covering the entire site with impermeable pavement
Answer: B. Improving soil structure and providing appropriate drainage
Rationale: Heavy clay can restrict infiltration, aeration, and root development.
Appropriate soil amendments, decompaction, drainage design, and careful
grading can improve growing conditions.
4. Which factor is most important when determining the suitability of a
proposed tree location adjacent to a building?
A. Tree color
B. Mature canopy and root-zone characteristics
C. Availability of annual flowers nearby
D. Temporary construction appearance
,Answer: B. Mature canopy and root-zone characteristics
Rationale: Tree placement must account for mature canopy spread, root
development, utilities, structures, solar exposure, maintenance access, and
potential conflicts.
5. What is the primary purpose of a landscape architectural site inventory?
A. To establish final construction costs
B. To document existing physical, environmental, cultural, and regulatory
conditions
C. To select every plant before design begins
D. To produce the final construction documents
Answer: B. To document existing physical, environmental, cultural, and
regulatory conditions
Rationale: Inventory establishes the factual foundation for subsequent analysis
and design. It should document natural and constructed features as well as
relevant regulatory and contextual conditions.
6. Which grading method is most appropriate for verifying whether a
proposed accessible route meets required slope criteria?
A. Visual inspection only
B. Spot elevations and calculated slopes
C. Planting-plan review
D. Soil texture analysis
Answer: B. Spot elevations and calculated slopes
Rationale: Accessible routes require measurable slopes and cross slopes. Spot
elevations allow the designer and reviewer to calculate and verify compliance.
7. A proposed walkway has an elevation change of 3 feet over a horizontal
distance of 60 feet. What is the approximate running slope?
, A. 2%
B. 5%
C. 10%
D. 20%
Answer: B. 5%
Rationale: Slope percentage equals rise divided by run multiplied by 100. Three
divided by 60 equals 0.05, or 5%.
8. Which soil property most directly affects the amount of water available for
plant uptake?
A. Soil color alone
B. Texture, structure, and organic matter
C. Surface temperature alone
D. Rock color
Answer: B. Texture, structure, and organic matter
Rationale: Soil texture and structure influence pore-size distribution, drainage,
aeration, and water-holding capacity. Organic matter can improve aggregation
and available water in many soils.
9. When locating a large deciduous shade tree on the south side of a building,
which factor deserves particular consideration?
A. Winter sun obstruction
B. Potential summer shade and winter solar access
C. Flower color only
D. Lawn mowing frequency only
Answer: B. Potential summer shade and winter solar access
Rationale: Deciduous trees can provide useful summer shading while allowing
greater winter solar penetration. Their mature size and location should be
evaluated in relation to building energy performance.
