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Damping off
Decay of young seedlings at ground level following fungal attack. Often the result of soil borne diseases and over watering.
 
Deadhead
The removal of spent blossoms; promotes reblooming by preventing seed production.
 
Deciduous
A plant that drops its leaves yearly at the end of the growing season.
 
Defoliation
The loss of a plant's leaves due to an unnatural cause such as wind, drought, early frost, chemicals, insects, or disease.
 
Dethatch
Remove the dead stem build-up beneath lawn grasses.
 
Dieback
Death at the tips of a plant, usually the result of disease or damage.
 
Dioecious
A plant having unisexual flowers, with each sex on a different plant.
 
Disbudding
The pinching off of selected buds to benefit those left to grow.
 
Division
Removal of part of a plant with roots in order to produce another plant.
 
Dormancy
The temporary slowing or stopping of growth, usually during winter.The rest period of a plant during which it is not growing or showing signs of life. Also refers to seeds before they sprout.
 
Drawn
Excessively tall and weak growth, caused by plants being grown in too little light or too closely together.
 
Dripline
The circular area under a tree from the trunk to the outside tips of the branches.

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CSU/Denver County  Extension Master Gardener 2010
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Date last revised: 01/05/2010