or more, according to its size, one or two such shoots may be 
taken from each plant for the purpose of propagation. 
Like most of the order it likes a strong rich but not 
damp soil during the growing season; when it has ceased 
growing it may be taken up and treated like similar roots 
during winter, care being always taken to keep them dry, 
free from frost, and as much excluded from the air as possible. 
The plants in the garden of the Society were raised from 
seeds collected by Mr. Hartweg in 1838, of which a large 
quantity was distributed, with a ‘label marked Convolvulacea, 
splendid, half-hardy; a designation which the plant truly 
merits. 
