Content tagged "ornamental trees"

Are there long-term effects of drought on trees?

Gardens & Landscapes Drought Resources Updated: November 10, 2016

When an area has repeated dry periods, even if lack of rain occurs during different seasons, the long-term effects are substantial:• Trees show increased...

Trees and Shrubs

Gardens & Landscapes Updated: November 17, 2015

Trees and Shrubs | Selection | Planting | Maintenance | Problems     Trees and Shrubs content reviewers share their expertise with eXtension's Gardens,...

Ways to Buy Trees and Shrubs

Gardens & Landscapes Updated: March 11, 2014

When you shop for trees, you will find them offered for sale as bare-root, containerized, balled and burlapped (B&B), and tree spaded.You will generally...

Trees and Shrubs: Problems

Trees and Shrubs | Selection | Planting | Maintenance | Problems Links to external web pages are followed by the source's name in parentheses.What's wrong...

Trees and Shrubs: Maintenance

Gardens & Landscapes Updated: March 11, 2014

Trees and Shrubs | Selection | Planting | Maintenance | Problems Links to external web pages are followed by the source's name in parentheses.Newly planted...

Trees and Shrubs: Planting

Gardens & Landscapes Updated: March 11, 2014

Trees and Shrubs | Selection | Planting | Maintenance | Problems Links to external web pages are followed by the source's name in parentheses.Planting trees...

Trees and Shrubs: Selection

Gardens & Landscapes Updated: March 11, 2014

Selecting trees and shrubs to become mature, healthy, woody plants begins with finding plants suited for their site. Factors such as climate, soil, light,...

What could be causing spots on the leaves of aspen trees and what is a recommended treatment?

Gardens & Landscapes Updated: February 14, 2012

Aspens are susceptible to many problems in the urban landscape. One of those problems is aspen leaf spot, a disease caused by fungus. Aspen leaf spot, or...

Why is the live oak called "live"?

Gardens & Landscapes Updated: November 09, 2011

The live oak, Quercus virginiana, is named "live" because it is an evergreen oak rather than a deciduous (loses its leaves every year; has a dormant winter...

What is wrong with a mature ponderosa pine with globs of sap on the bark on the main trunk and an overall gray-green color that is starting to turn brown?

Gardens & Landscapes Updated: October 17, 2011

A ponderosa pine with symptoms such as globs of sap on the trunk and a pale green color may be the result of invasion by mountain pine beetles, which...

The leaves on my aspen tree are all sticky. What insects are doing this and is there a recommended treatment?

Gardens & Landscapes Updated: October 16, 2011

Dozens of species of aphids (plant lice) may be found on shade trees and woody ornamental plants in Colorado. Aphids feed on plants by sucking sap from the...

My aspen tree has little knobby growths all over the branches; what is it and how can it be treated?

Gardens & Landscapes Updated: October 16, 2011

Knobby growths on aspens are symptoms of twig gall, something particularly common in Colorado’s Front Range area. A gall is basically a growth that is...

What are some methods to prevent or treat scale insects on conifers? I live in Colorado.

Scale insects are some of the most important pests affecting conifer trees and shrubs in Colorado. As scales feed on bark and needles, they remove sap and...

Why do I need to use "tree wrap" on my newly planted trees?

Gardens & Landscapes Updated: October 02, 2011

"Tree wrap" is necessary for, not only newly planted trees but also thin barked trees, like soft maple, honeylocust and crabapples. Tree wrap is used to...

Our bottlebrush tree (Callistemon rigidus) is more yellow than green and has dark spots on the leaves. Should we add iron or some other nutrient?

Gardens & Landscapes Updated: October 02, 2011

Bottlebrush, or Callistemon rigidus, does respond to the addition of iron products and to mulching heavily. However, a water-soaked root system can cause...

I want to prune my aspens. When is the best time of year and is there a certain way?

Gardens & Landscapes Updated: December 10, 2010

When I prune my tree, should I paint or otherwise treat pruning cuts?

Gardens & Landscapes Updated: August 26, 2009

Are Canadian Hemlock (Tsuga canadensis) trees suitable for Colorado?

Gardens & Landscapes Updated: October 28, 2008

Which pear tree would be best in my back yard: Aristocrat or Bradford? Also, is it true that pear trees are an invasive species in Colorado?

Gardens & Landscapes Updated: May 15, 2008

Will the Thuja Green Giant tree thrive in Denver, Colorado? We'd like an evergreen.

Gardens & Landscapes Updated: May 15, 2008

What is the difference between a Schwedler maple and a Deborah Norway maple?

Gardens & Landscapes Updated: May 15, 2008

When is the best time to trim evergreen trees?

Gardens & Landscapes Updated: May 15, 2008

Why do my camellia flower buds turn brown and/or drop off of the plant before opening?

Gardens & Landscapes Updated: May 15, 2008

I have a five year old Japanese lilac tree (Syringa reticulata). The tree is in the middle of a large annual planting bed and I add slow-release fertilizer for the annuals every spring. The tree has never bloomed. The tree has healthy, green foliage.

Gardens & Landscapes Updated: March 05, 2008

We have a mature silver maple with above ground roots. We cut the roots out to be able to mow and to reduce tripping. We were told by a local landscaper that removing the large roots won't hurt. Will the tree be okay?

Gardens & Landscapes Updated: March 04, 2008

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