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Should they have full sun? 13 
SUN AND AIR 
Sun and air are as important as soil conditions for the successful 
growth of healthy plants. The majority of succulents are sun wor- 
shippers and are accustomed to long periods of dry heat. Desert 
plants transplanted to gardens where heavy fogs prevail soon lose 
their beautiful spine coloring and become blackened. Glasshouse 
culture can sometimes preserve their native appearance, but over- 
watering 1s always a great temptation. 
While most succulents need plenty of light, not all of them enjoy 
full exposure to a burning sun all day. Some types such as the Orchid 
Cacti (Ep/phyllums) and some of the Houseleeks (Sem pervivums) 
thrive in partial shade but never in a north window. 
Because of the limited root system, many cultivated plants cannot 
stand the direct rays of the sun without some protection. Desert 
plants, especially the cacti, are often heavily spined and therefore 
can better resist strong sun but under glass divided light and shade 
are needed. Sunburn is recognized by the yellow or white coloring 

A lean-to frame protects the plants from cold and hard rains. 
The sash can be raised to permit plenty of fresh air. 
which is always localized on the top or south side of the plant. 
Brown spots or scabs then develop that disfigure the plant. 
When plants are kept too dark they produce abnormal growth and 
become elongated and colorless and when grown in full shade are 
