CSLB Landscaping (C-27): Online Practice Exam

What this exam covers

Practice questions for the California CSLB Landscaping (C-27) license exam, delivered online and graded instantly. Per the state's classification, a C-27 contractor constructs, maintains, and repairs plots and areas of land including hardscapes, drainage systems, irrigation, planting, and retaining walls. Works on any device, including iPad. See the official CSLB C27 classification.

Updated July 2026 · 2022 CA Codes · 667 Questions · Topic Practice

• Content Last Updated: July 24, 2026
• Code Basis: 2022 California Codes
• Question Count: 667 practice questions
• Organized By: CSLB study-guide topic categories
• Includes: This practice exam has been updated using Peerless’s vetted usable question set. Questions are organized by CSLB study-guide topic categories and include answer explanations to support full-exam review and focused topic practice. Each topic has a mini-exam to help you develop mastery.

Sample questions — Try our free practice test

1. What is the cause if a ring of green lawn surrounds al of the sprinkler heads on a lawn?
   ✓ A. Excess water pressure · B. Wrong valve type · C. Mechanism is defective · D. Sprinkler head is too low
2. After sowing a newly seeded lawn, a thorough soaking is necessary and after that it should be watered:
   A. once per day · B. morning and evening · ✓ C. with a light sprinkling by hand applied 3 to 4 times a day · D. once a week
3. After the grass seed has germinated, the watering schedule should be adjusted:
   A. to gradually increase · ✓ B. to gradually decrease · C. by not watering until ready to mow · D. by watering heavily until ready to mow
4. After you grub a shrub or tree, what should you do with debris?
   A. Put it next to the grading site · B. Put it 10 feet from the grading site · ✓ C. Take it to the dump · D. Burn it
5. After you have purchased plants in containers for a landscaping job, which of the following methods of removing the plant is MOST accurate for the LEAST amount of damage to the plant?
   A. Turn the can upside down and tap on the bottom of the can · B. Gently, but firmly, pull the plant from the container · ✓ C. Cut the sides of the can from top to bottom on at least three sides and remove the plant from the container · D. Roll the can on its side and pull the plant from the can