Certified Gardener Program From CSU Extension

Course Descriptions

AGBB 2050 – How Plants Grow (~6-9 hours)

This course teaches you how to use common horticulture terminology and the system of taxonomy and classification. You’ll also explore key plant structures and an accessible overview of three processes critical to plant growth: respiration, photosynthesis, and transpiration.

AGBB 2090 – Soils, Fertilizers, and Soil Amendments (~6-9 hours)

This course covers key soil attributes, characteristics of typical landscape soils, considerations of soil amendments, fertilizer and mulch selection, and management of soil pH, iron chlorosis, and compaction. You will also learn about the relationship between soil texture, structure, and pore space, how to take a soil test, and more.

AGBB 2030 – Diagnostics and Pest Management (~16-24 hours)

This Quest bundle allow you to sign up for multiple courses at once and receive discounted pricing. This bundle includes the following courses:

  • AGBB 2031 – The Diagnostic Process (~4-6 hours)
    Explore critical concepts such as Integrated Pest Management as it applies to the landscape environment, the life cycle of trees, steps in the diagnostic process, and diagnostics of abiotic disorders.
  • AGBB 2032 – Insects (~4-6 hours)
    After this course, you will be able to identify common insects and their relatives according to taxonomic orders. Use this knowledge to apply appropriate management options and keep your plants healthy!
  • AGBB 2033 – Plant Diseases (~4-6 hours)
    Everyone wants healthy plants. Through this course, learn about fungal, bacterial, viral diseases, and abiotic disorders so you can successfully identify and manage common landscape/garden diseases.
  • AGBB 2034 – Weeds (~4-6 hours)
    This course defines what a "weed" is from the perspective of the home landscape, including problems they cause and contributing factors, the difference between noxious, native, and invasive weeds, and resources available for weed identification. Delve into important control strategies and herbicide use and selection.
AGBB 2040 – Trees and Shrubs (~10-15 hours)

This Quest bundle allow you to sign up for multiple courses at once and receive discounted pricing. This bundle includes the following courses:

  • AGBB 2041 – Identifying Trees and Shrubs (~2-3 hours)
    Do you ever wonder about the plants you see in your daily life? Take this course to gain an understanding, appreciation, and ability to identify common trees and shrubs in the landscape.
  • AGBB 2042 – Tree Selection and Planting (~4-6 hours)
    This course applies Right Plant, Right Place considerations for tree selection and placement, as well as covering steps to tree planting for rapid root establishment and post-planting care.
  • AGBB 2043 – Pruning (~4-6 hours)
    Become an expert in all things tree pruning. Learn how trees grow and how that influences decay, find out the difference between removal cuts, reduction cuts, and heading cuts, and discover pros and cons related to the time of year you prune and considerations to take in how much foliage to remove. In addition to pruning techniques and methods for young and mature trees, you'll also dive into pruning options for flowering and evergreen shrubs.
AGBB 2010 – Herbaceous Plants (~2-3 hours)

This course provides an overview of growing herbaceous plants (annuals, biennials, and perennials, including flowers). The course covers plant selection criteria for various garden situations, teaching you how to interpret plant labels and all the information found there, including life cycle, exposure, irrigation and soil requirements, and drought tolerance. Also learn about methods to create and utilize microclimates.

AGBB 2060 – Lawn Care (~2-3 hours)

The course covers foundational, routine lawn care for cool season turf grass, including mowing, fertilization, and irrigation. Also learn keep tips for thatch, soil, and weed management.

AGBB 2080 – Fruits and Vegetables (~6-9 hours)

This Quest bundle allow you to sign up for multiple courses at once and receive discounted pricing. This bundle includes the following courses:

  • AGBB 2081 – Small Fruits (~2-3 hours)
    This course offers an understanding of planting, pruning, and general care of raspberries, blackberries, strawberries, and grapes.
  • AGBB 2082 – Tree Fruits (~2-3 hours)
    This course discusses critical considerations when planting fruit trees at home, including structural training and annual pruning of apple and peach trees. Then, explore recommendations to manage common pests and diseases.
  • AGBB 2083 – Vegetables (~2-3 hours)
    Craving delicious, home-grown vegetables? Take this course to learn foundational principles for planning a vegetable garden, including planting times, layout design, soil preparation and fertilization, routine care, and frost protection tips.
AGBB 2070 – Water Wise Landscape Design (~4-6 hours)

Want to save money and conserve water? Discover six steps to landscape design, including why the process is important and water savings involved. This course will cover site analysis regarding how family values play into landscape design, what hydrozoning means for water savings and plant selection, and how to use rectilinear, curvilinear, and angular design styles. You'll finish the course with tips and tricks to mix lines, color, texture, and form with scale, balance, simplicity, variety, emphasis, and sequence to create unity and pizzazz in your designs.

AGBB 2020 – Irrigation Management (~4-6 hours)

Learn how to perform a lawn irrigation check-up in this course. Also explore key issues surrounding Colorado's water situation and Western water rights, covering the maintenance and management of efficient landscape irrigation.

AGBB 2015 – Houseplants (~2-3 hours)

Explore the history, benefits, and ideal conditions for successfully growing plants indoors, including light, temperature, humidity, water, and fertilizer. The course also provides an overview of common houseplants to better identify and select plants based on indoor conditions and required maintenance. Common houseplants pests and diseases will also be covered.

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