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Habit
The characteristic growth or general appearance of a plant.
 
Hardening off
The process of gradually exposing seedlings started indoors to outdoor conditions before transplanting.
 
Hardiness
The ability of a plant to withstand winter cold; often expressed in terms of geographic zones.
 
Hardy
A plant which can withstand prolonged exposure to temperatures at or below 45"F.
 
Heading back
Pruning off the terminal growth of a plant.
 
Herb
A plant grown for flavoring or medicinal purposes
 
Herbaceous
A plant with a non-woody stem that dies back to the ground in winter.
 
Herbicide
Any material that kills plants, generally weeds.
 
Honeydew
Sticky, sugary secretion deposited on plants by insects such as aphid and whitefly.
 
Horticulture
The cultivation of plants for ornament or food.
 
Houseplants
Plants that are grown and raised indoors in containers
 
Humidity
The amount of water vapor present in the air. Relative humidity is the percent present in the air relative to the amount that the air could contain, given the temperature.
 
Humus
Partly or wholly decomposed vegetable matter; an important constituent of garden soil.
 
Hybrid
A plant with parents which are genetically distinct. The parent plants may be different cultivars, varieties, species or genera but not different families.
 
Hydroponics
A plant with parents which are genetically distinct. The parent plants may be different cultivars, varieties, species or genera but not different families.
 
 

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