In most situations deciduous trees, evergreen trees, and ornamental shrubs that are planted in a landscaped environment are growing in poor soil. The Black Hills area does not have abundant deposits of rich soils and two to six inches of top soil hauled in to a landscaped environment does not provide enough nutrients for vigorous, healthy trees.

(Picture:Back trees fertilized, front not)

Fertility Back are Front notExamples: Trees showing not enough fertility have poor color, slow growth, freeze damage, spindly growth in the crown, high death loss of young trees, increased insect activity (bores, aphids, etc). Increase of disease, especially needle blight on evergreen and canker on deciduous trees and low fruit production on trees.


Warne Chemical injects, under pressure, the proper amount of fertilizer into the root zone of the trees and ornamentals. We use only high quality, low salt and slow release fertilizer. One feeding will feed for an entire year. We use a complete fertilizer plus an iron/sulfur supplement.systemic fertility th


We recommend fertilizing every year to accomplish the following:

  • Increased growth of young trees and shrubs

  • Increased winter hardiness and longevity

  • Improved color and density of canopy

  • Builds a hardier plant to resist and overcome disease and insects

  • Increases the livability of young plants less than ten years old


The best time to fertilize is late fall after the leaves have ceased to function and in early spring. We recommend fertilizing every other year the larger mature, healthy trees and shrubs where growth is not desired to improve color and density of canopy and build a hardier plant to resist and overcome disease and insects. Unthrifty mature trees and shrubs should be fertilized every year.


Fertilizing trees and shrubs during the mid part of the growing season is recommended only for those plants that are in an unthrifty condition.


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First Year Fertilized Second Year Fertilized    Third Year Fertilized






To help understand why an urban tree needs fertilizer, let’s compare a tree in your yard to one in the forest. Typically, we give trees planted in a yard much more care than a forest tree. Why?


Let’s first examine the planting site and its parent soil.Deep_root_feeding_fact_sheets_html_m68ca3d9.jpg


The urban tree has been planted in disturbed soil and,

in fact, may not have any topsoil or organic material

at all. Often these soils are wet, with very poor

aeration, high in clay content, and very low in coarse

materials such as sand or silt.


Meanwhile, out in the forest, the soils have not been disturbed. Leaves drop each year to add a continuing supply of organic material. Micro-organisms work to break down leaves and other vegetation into humus and mineral elements. Earthworms mine the soil and aid in soil aeration.


There is no construction equipment or foot traffic to compact the soils. Drainage has not been interrupted with underground construction, compacted soils or grade changes. Tree roots don’t have to compete with the lawn for water and nutrients.


It’s no wonder trees grow so well in the forest!


Thus, it is up to us to take what steps may be necessary to provide the best growing conditions possible for our urban trees, including fertilizing.


The liquid root fertilization process provides the elements essential for healthy, vigorous plant growth. This also increases a tree’s resistance to insect and disease attack. Give your trees and shrubs the tender, loving care they deserve. Put them on a diet of liquid root fertilization.