Treatment Process

As part of the Chicago Ranch Revegetation Plan, Triview Metropolitan District is working to restore native vegetation and reduce invasive weeds. This process involves careful, science-based use of herbicides under the guidance of environmental experts.

What is being Treated:

• The most common invasive weed on the property is Canada thistle, a fast-spreading plant that crowds out native grasses and wildflowers.

How it is being treated:

• To manage this weed safely and effectively, trained professionals will apply a herbicide called Milestone®, which targets thistle while being safe for surrounding grasses and wildlife when used properly.
• Application Type: Spot spraying only — this means only the thistle plants will be treated.

Timing:

• In spring (May–June), before the plants flower
• Again, in fall (September–November), after seeding

What’s in the Herbicide?

• Milestone® uses a low-dose active ingredient called aminopyralid, commonly used on open lands and rangelands.
• A small amount of non-ionic surfactant (like soap) is added to help the herbicide stick to the leaves.

When It’s Safe to Spray

• No spraying if it’s windy, raining, snowing, or if plants are frozen
• All applications follow environmental guidelines to protect water, wildlife, and soil health

Who’s Applying It?

• All herbicide is applied by a licensed professional applicator using approved equipment. In 2025, the applicator is Jeremy Hendrickson, certified by the State of Colorado.