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Pro Knowledge

Best Practices help industry professionals avoid missteps and operate collectively for the greater good of our industry and our state.

GreenCO Best Management Practices (BMPs), are guidelines on how to reduce water consumption and protect water quality while producing, designing, installing and maintaining healthy, beautiful landscapes. The current BMPs as well as information on BMP Training can be found on the GreenCO website. Additional water related information is available at the GreenCO website.

These materials were developed by GreenCO members in cooperation with Colorado State University Cooperative Extension, Denver Water, Northern Colorado Water Conservancy District and Wright Water Engineers.

Plant Select Announces 2016 Winners

March 8, 2016 - Plant Select®, the country’s leading source of plants designed to thrive in High Plains and Intermountain regions, has announced new introductions and winning plants for 2016. They include two new, improved ice plants, a super cold-hardy compact viburnum, two new selections of native plants, three super cute Petites and a new turf grass developed especially for high, dog-traffic areas. Look for these and other Plant Select® winners at local, independent garden centers and nurseries all season long. Descriptions of winning plants. Plant Select website.

2016 Colorado State University Perennial Flower Trial Performance Report

The 2016 CSU Perennial Performance Report, including top performers, is available for download. Over 233 varieties of perennials from 16 plant and seed companies were evaluated for their performance in the High Plains and Rocky Mountain Region. The Trial Gardens are managed by staff from the CSU Dept. of Horticulture and Landscape Architecture with substantial oversight from the Perennial Trial subcommittee, which is part of the Annual Flower Trial Garden committee. Each entry must have been introduced within the past three years and is evaluated for three complete years and two winters to determine hardiness and consistent landscape performance. The purpose of the trial garden is to evaluate the performance of herbaceous perennial plant species and cultivars under our unique Rocky Mountain environmental conditions.

Growing conditions are characterized by high altitude, intense solar radiation, drying winds, severe hailstorms, large fluctuations between day and night temperatures, and a season-long need for irrigation. Plants are evaluated for plant vigor, uniformity, floriferousness, and tolerance to environmental and biotic stresses. Data (ratings and photos) were collected every two weeks (April to early October) by the Perennial Trial Garden Coordinator. Plants were also evaluated once a month by some members of the Perennial Trial subcommittee. The Perennial Trial subcommittee met November 16th, 2016 to review data and photos to vote on which entries should be designated a “Top Performer” for the class of 2014

2015 Colorado State University Flower Trials Performance Reports

Colorado State University has released performance reports for their Annual and Perennial Flower Trials. The research was conducted at the Flower Trial Garden next to the University Center for the Arts. In 2015, over 750 varieties of annuals were evaluated for their performance in the High Plains and Rocky Mountain Region. Click here to view pictures and read descriptions of the 2015 "Best of" Annuals. The full report can be found here.

The 'Top Performer" perennials include nine winners along with two varieties designated as "Too Good to Wait." Click here to see the complete performance report.

Managing Emerald Ash Borer: Decision Guide and 'How to Assess Your Tree' Video

Emerald Ash Borer (EAB) was found in Boulder in September 2013. As of April of 2014 additional infestations have not been identified. To help keep the spread of this pest to a minimum, knowing if there are Ash trees on properties and watching for changes in the health of the tree are vital since this invasive pest cannot be visually detected in the early stages of its presence. This guide is provided as a resource for you and your customers to help minimize the spread, keep trees that are valuable to the owner viable, and know what treatment options are available. Other resources can be found at

Colorado State Extension has produced a short video that gives homeowners an easy to understand assessment process for identifying the presence of Emerald Ash Borer. The 4 minute video covers basic diagnostics from properly identifying the ash tree to annual evaluations of crown thinning and dieback to proper identification of EAB exit holes. Watch the video.

Quarantine in Effect - One key to controlling the spread of EAB is to NOT take ash wood out of Boulder County. In fact, it is illegal to do so and a quarantine area has been established. This flyer describes the quarantine guidelines and includes a map of the quarantine area.

Alternatives to Ash

Emerald ash borer is responsible for the loss of tens of millions of Fraxinus, wreaking havoc on boulevards and growing fields alike. But a broad selection of shade trees is available, ready to serve as suitable substitutes. Read More


GreenCO Legislative Affairs

2015 Year End Report

2014 Legislative Policy Priorities

2013 Legislative Session Report

Colorado Nursery Act

The glossary is provided to facilitate a clear understanding of terminology between the Colorado Measurement Standards Section and the green industry.

Japanese Beetle Update

Quarantine Implementation

Colorado’s Japanese beetle (Popillia japonica) Quarantine has been in effect since January 1, 2010. How will the quarantine be enforced? What is required of Colorado’s nursery growers, producers and landscapers?

Front Range Tree Recommendation List©

The Front Range Tree Recommendation List© was developed through the collaborative efforts of 12 individuals, three from each of the four participating professional groups: the American Society of Landscape Architects (ASLA), the Colorado Nursery & Greenhouse Association (CNGA), municipal arborists representing the Colorado Tree Coalition (CTC), and the Colorado State University (CSU) Extension. Based on the committee’s collective education, knowledge, and experience more than 250 trees or varieties were evaluated and rated, resulting in a single reference list for professionals to use and share with their customers or residents. View and download the List.

GreenCO Tree Planting Recommendations

This recommendation, presented by a GreenCO committee in February 2012, is the result of collaborative work by industry professionals representing the Colorado Nursery & Greenhouse Association (CNGA), municipal arborists/Colorado Tree Coalition (CTC), American Society of Landscape Architects-Colorado (ASLA-CO), Associated Landscape Contractors of Colorado (ALCC), and Colorado State University (CSU).

The purpose of the project was to create a single recommendation for green industry professionals that was based on respected sources and decades of hands-on experience by professionals involved in the growing, siting, installation, and care of trees. Current research in addition to the experiences of those on the committee was used in the development of the recommendation. The collective intent was to ensure the best possible outcome for the planting of trees in the landscape.

To view, download and print the GreenCO Tree Planting Recommendations, click here.

Container Labeling

Colorado Standards for Container Labeling
Glossary of Weights and Measures Terms

National Standards for Container Marketing - This document was developed through a collaborative effort between industry representatives and Colorado Measurement Standards Section, the agency responsible for Colorado inspections. For those buying products outside Colorado, it is recommended that you advise them of the Colorado requirements. Educational enforcement will begin January 2007. State inspectors call on businesses selling green goods to learn more about the industry, evaluate, and assist the companies toward full compliance. Calculating Pot Volume - The part of a right circular cone between the base and a plane parallel to the base whose distance from the base is less than the height of the cone.

Height: h
Radius of bases: r, R
Volume = ð * h (R2+rR+r2) / 3