The author has attempted in this glossary to compile a set of terms or words commonly used in landscape literature pertaining to general planting design. Landscape architecture is one of the younger professions. It has no distinct vocabulary so recognized by the dictionary of to-day.

Such words as establish, naturalize, open allee, pleached allee, puddle, and leggy as applied to the language of this profession require a definition other than those commonly given to such words. The definitions here given are those which are generally accepted by practicing landscape architects.

No attempt has been made to define a large group of other words which are used in the general field of landscape construction work as differentiated from planting design and its execution.

Accent Plant

A plant used to give prominence to its location either because of peculiarly interesting habit of growth, characteristics of fruit or of flowers or foliage.

Acclimatize

v. To make accustomed to a climate to which a plant is not native.

Acid Soil

A soil containing an excess of uncombined acids. Any acid soil is objectionable (even when only very slightly acid) to most plants, except ericaceous plants. Changes blue litmus paper to red.

Agricultural Lime

An unstandardized product from the unburned cores of lime kilns, mixed with other better material but rarely having a better value than fine pulverized limestone.

Air-slaked Lime

Is the compound formed by the action of carbon dioxide, from the air, on hydrated lime. Its formula is (Ca Co), or the same as pure limestone.

Alkaline Soil

A soil containing an excess of uncombined alkali, lime, magnesia, sodium carbonate, etc. A good soil should be very slightly alkaline. Changes red litmus paper to blue.

Allee, open

A way framed on either side by symmetrical rows of closely planted trees or tall shrubs (of a height not less than twice the width between rows), and so maintained that either side presents a continuous vertical wall of close-growing foliage.

Allee, pleached

A way framed on either side by symmetrical rows of closely planted trees or shrubs, so maintained that the branches of the continuous walls of close-growing foliage arch and interweave across the top of the way, at a height of not less than seven or eight feet.

Annuals

Plants which develop from seeds each year, mature, produce ripened seed, and die during the same growing season.

Alpine Plants

Plants adapted to living in exposed situations but requiring a constant seepage of cool water through the soil surrounding their roots. Alpine plants are not drought-resisting.

Anthracnose

A plant disease caused by a parasitic fungus of one definite class (melanconiae).

Arborescent Shrubs

Those plants on the borderline between shrubs and trees.