PLANTS WORTH GROWING 155 
whoever desires to make a special study of one 
particular class of plants and to acquire gradually a 
representative collection may find here a family 
that will keep him occupied for years, and will call 
into requisition all the aspects, exposures, and soils 
that the most elaborate garden can provide. 
For ease of culture the Germanica section, the 
Pumilas, Sibericas, and Spurias may be made a 
starting-point by the novice. The connoisseur will 
in due time try his skill with the Oncocyclus and 
Regelias, the remarkable Iris Susiana with its black- 
netted blossoms being a favourite among this group. 
There are the bulbous types and species as well 
as the rhizomatous, and we may have Irises in the 
water and bog garden, Irises on the rockery, and 
others among the ordinary perennials of the her- 
baceous border. 
Isatis glauca. — Why it is we so seldom see Isatis 
glauca in herbaceous borders is difficult to under- 
stand. The plant makes tall branching stems 
clothed with glaucous foliage and produces great 
spreading masses of tiny golden flowers, waving in 
the slightest breeze like a cloud of yellow smoke. 
The plants scatter seed freely, and an abundant 
supply of seedlings is thus obtainable which can be 
transplanted in Spring. 
Kniphofia. — The Torch Lily or Red-Hot Poker is 
a noble plant, making a truly gorgeous display in 
late Summer and early Autumn. Two points must 
be observed to ensure successful cultivation. When 
