Welcome to the Horizon Landscape & Irrigation Learning Center, a reference guide for helpful information and tips on taking care of your outdoor spaces in Colorado.


Lawn MitesFebruary 7, 2018

Turf damage due to mites is common February through May in Colorado, especially in years like this when precipitation is below average, and the lawn gets no winter watering.  Depending on the severity of the mite infestation, turf damage may range from minor thinning to complete kill. Areas of your lawn will be brown and straw-like in appearance when mites are present.  Unfortunately, these areas will not be visible until early spring.  Damage occurs most often on south or west facing exposures where turf received direct sun exposure. Small areas of infestation may recover over...
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Deep Root Watering for TreesFebruary 7, 2018

Once winter comes, most people assume that their trees will receive enough moisture from the snow to make it through until irrigation systems are activated once again.  In Colorado, we generally have times when we have warmer temperatures and little moisture in the winter.  November through February tend to be very dry months for Colorado and we may need to supplement water to keep our trees healthy. Trees should be watered about every three to four weeks depending on the moisture.  Temperatures need to be above 40 degrees.  Allowing the soil around trees to freeze while dry will...
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Winter WateringOctober 25, 2017

Dry air, low precipitation, little soil moisture, and fluctuating temperatures are characteristics of fall and winter in many areas of Colorado.  Trees, shrubs, perennials and lawns may be damaged if they do not receive supplemental water.  Susceptibility to damage increases for lawns, plants and trees with southern or western exposure.  Also, newly planted trees and shrubs are most susceptible to winter drought injury.   Watering Guidelines: Water only when the air temperatures are above 40 degrees F. Apply water at mid-day to allow absorption before possible freezing...
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Emerald Ash BorerOctober 25, 2017

Emerald Ash Borer The Emerald Ash Borer is relatively new to the state of Colorado but it’s a beetle that is most concerning to Agricultural Officials.  Cities, HOAs and property owners with ash trees can expect the pest to cost them. Unfortunately, there is no way to prevent the spread of the pest infestation and the areas of the metro area that are or will be affected.  Property owners can decide to treat the ash trees, replace the trees, or leave them unprotected and replace them as they become affected.   There is a cost to the property owner no matter what option is...
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AerationOctober 25, 2017

What is aeration? Technically speaking, aeration is the naturally occurring process of air exchanges between the soil and its surrounding atmosphere.  Practically speaking, aeration is the process of mechanically removing small plugs of thatch and soil from the lawn to improve natural soil aeration.   Aeration reduces soil compaction and promotes root growth for healthier grass.   What are the benefits of aeration?
  • Improved air exchange between the soil and atmosphere
  • Enhanced soil water uptake
  • Improved fertilizer uptake and use
  • ...
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