Difference between revisions of "Evergreens"

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Evergreens. In horticulture, evergreens are plants that retain green foliage the year around; they do not shed all their foliage at any one time; in some cases, the individual leaves may remain attached and green for some years, as in many of the Coniferae, but in all evergreens the old leaves shed after a time when they become so overshadowed or crowded as to be no longer functional. The leaves of pines and spruces may persist three to fifteen years.
 
Evergreens. In horticulture, evergreens are plants that retain green foliage the year around; they do not shed all their foliage at any one time; in some cases, the individual leaves may remain attached and green for some years, as in many of the Coniferae, but in all evergreens the old leaves shed after a time when they become so overshadowed or crowded as to be no longer functional. The leaves of pines and spruces may persist three to fifteen years.
  
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Small evergreens up to 2 feet high may be planted in August and September from one part of the nursery to another without balls of earth, if the roots are very carefully dissected out without breaking. There will be more failures if the week following planting is hot and dry.
 
Small evergreens up to 2 feet high may be planted in August and September from one part of the nursery to another without balls of earth, if the roots are very carefully dissected out without breaking. There will be more failures if the week following planting is hot and dry.
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Planting with balls of earth may continue all winter, especially if the ground is mulched to keep out the frost and permit economical digging of the tree and the hole. The frozen ball of earth is an old method, frequently referred to, but is not an aid. If the ball is frozen solid and remains so for one or two months with dry winds, the top may dry out and die as has occurred with red cedar. If the ball is not frozen, sap can come up to take the place of that lost by transpiration.
 
Planting with balls of earth may continue all winter, especially if the ground is mulched to keep out the frost and permit economical digging of the tree and the hole. The frozen ball of earth is an old method, frequently referred to, but is not an aid. If the ball is frozen solid and remains so for one or two months with dry winds, the top may dry out and die as has occurred with red cedar. If the ball is not frozen, sap can come up to take the place of that lost by transpiration.
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A ball of earth 3 feet in diameter is needed for an evergreen 8 to 10 feet high ; 4½ feet in diameter for an evergreen 15 feet high, except red cedar which can have a ball 3 feet; a ball of earth 12 feet in diameter is needed for a pine 35 feet high. Root - pruning pines, spruce and hemlock, permits moving the following year with a smaller ball than otherwise. In root- pruning, the trench can go three-quarters of the way around or three or four of the larger roots can be left across the trench to keep the tree from blowing over. Root-pruning of red cedars is of less advantage and is rarely practised. In New England and northern New York, the pine, spruce and hemlock, have only a few coarse roots just under the surface and no roots extending 2 feet deep. When moved to better-drained soils on the coastal plain, they develop deeper roots and have ten times as many fibers in a ball 4 feet in diameter. The above evergreens with their shallow root-systems can be taken up with a disc of roots, peat and grass 8 inches deep and 3 to 4 feet wide. This can be set on a wagon and: trees 10 to 15 feet high easily moved. Less roots will be broken or bare if the ball is tied in burlap. The usual cause of failure in this operation is neglect of watering. Hemlocks and probably other trees will be aided by shading for the first two months. Henry Hicks.
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A ball of earth 3 feet in diameter is needed for an evergreen 8 to 10 feet high ; 4½ feet in diameter for an evergreen 15 feet high, except red cedar which can have a ball 3 feet; a ball of earth 12 feet in diameter is needed for a pine 35 feet high. Root - pruning pines, spruce and hemlock, permits moving the following year with a smaller ball than otherwise. In root- pruning, the trench can go three-quarters of the way around or three or four of the larger roots can be left across the trench to keep the tree from blowing over. Root-pruning of red cedars is of less advantage and is rarely practised. In New England and northern New York, the pine, spruce and hemlock, have only a few coarse roots just under the surface and no roots extending 2 feet deep. When moved to better-drained soils on the coastal plain, they develop deeper roots and have ten times as many fibers in a ball 4 feet in diameter. The above evergreens with their shallow root-systems can be taken up with a disc of roots, peat and grass 8 inches deep and 3 to 4 feet wide. This can be set on a wagon and: trees 10 to 15 feet high easily moved. Less roots will be broken or bare if the ball is tied in burlap. The usual cause of failure in this operation is neglect of watering. Hemlocks and probably other trees will be aided by shading for the first two months.  
  
 
Woody evergreens for New England and New York.
 
Woody evergreens for New England and New York.
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P=Protected at Arnold Arboretum, Boston.
 
P=Protected at Arnold Arboretum, Boston.
 
T=Tender above New York City.
 
T=Tender above New York City.
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Ralph W. Curtis.
 
  
 
Broad-leaved evergreens for Washington and the South.  
 
Broad-leaved evergreens for Washington and the South.  
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Rosettes.
 
Rosettes.
  
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Many herbaceous plants have rosettes of green leaves throughout the winter, the following being the more conspicuous on the Great Plains.  Charles E. Bessey.
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Many herbaceous plants have rosettes of green leaves throughout the winter, the following being the more conspicuous on the Great Plains
  
 
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==Cultivation==
 
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===Propagation===
 
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===Pests and diseases===
 
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==Species==
 
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==Gallery==
 
==Gallery==

Revision as of 18:59, 1 October 2009


Read about Evergreens in the Standard Cyclopedia of Horticulture 

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Gallery

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References

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