GLOSSARY 357 



Biennials: 



Plants which require two years to produce ripened seed. They form 

 buds at the crown of the root at the end of the first season. The next 

 season they bear ripened seed, and the plants die. 



Blight: 



A diseased condition caused by a parasitic fungus. 



Bog Garden: 



A garden composed largely of bog-loving plants. A garden on a rela- 

 tively low area consisting of a continuously wet, peaty soil, but not 

 containing stagnant water. 



Budding: 



The insertion of a bud from one plant (together with some live sur- 

 rounding tissue) beneath the bark'of another plant so that the cambium 

 layers join and grow together. 



Bulb: 



A subterranean leaf-bud consisting usually of several fleshy scales. 



Calcium Oxide: 



A compound resulting from the burning of limestone containing, when 

 pure, 40 parts of calcium and 16 parts of oxygen by weight. It is also 

 known as fresh burned or quicklime. 



Callus: 



The new tissue which forms over a wound as over the end of a cutting; 

 a protective measure provided in nature; but not always an indication 

 that the cutting will produce roots. 



Cambium, or cambium layer: 



The soft, very thin tissue lying between the bark and the woody tissue. 

 This is the tissue from which new wood originates and is the only truly 

 live portion of the stem of a plant. Plant food rises from roots to leaves 

 through the cells on the inner half of the cambium layer and returns 

 from the leaves downward as available plant food through cells on the 

 outer half of the cambium layer. 



Canker: 



An area attacked by a parasitic fungus. 



Carpet bedding: 



A design of plants which form a close mat on the surface of the ground 

 and respond to severe cutting back, as distinguished from ground- 

 cover plants which may stand several inches above the ground. 



