PLANTS WORTH GROWING 171 
blossoms after they have fully expanded. Cuttings 
of this plant will root if taken in September and 
inserted in a mixture of leaf-mould and sand. 
Ononis. — Of shrubby character, the " Rest Har- 
rows " are of compact and attractive growth, their 
flowers being pea shaped and of effective colouring. 
Arvensis is a native plant frequently met with on 
sandy drifts near the sea. O. rotundifolia and 
O. spinosa are both good plants with rosy-tinted 
blossoms. 
Onopordon. — The Onopordons are giant thistles 
of majestic appearance. Their huge, elegantly-cut 
leaves are densely covered with white woolly hairs, 
and their thistle-head flowers are borne on branching 
stems, producing a candelabra-like effect. 0. arabi- 
cum may easily be grown to a height of ten feet, 
frequent soakings with water and an occasional 
bucketful of liquid manure being all that is required 
to promote wonderful vigour. The Onopordons 
grow readily from seed, but should be planted in 
flowering quarters while quite young and small. 
The plants are best treated as biennials, in fact they 
generally flower to exhaustion in a season. 
Ostrowskia magnifica. — Here we have a real 
aristocrat among hardy perennials. It may be 
called a glorified Campanula, for it is the largest 
and most magnificent of the Bell-flowers. It is, 
however, stately and refined as a Lily, and its colour 
is delicate and full of charm, a pale and beautiful 
mauve suffused with white and with a richer shade 
