Encyclopaedia of Gardening 31 



plant that thrives with treatment as a hardy biennial. If there 

 were only these two the section would be important, but, as the 

 table shows, there are several. The best method of treatment for 

 the biennials is to sow the seed in well-pulverised soil in drills drawn 

 a foot apart in May or June, thin, hoe, set out a few inches apart in 

 a spare bed in July, and plant in beds and borders in autumn. 

 When treated thus they are strong and sturdy, transplant well in 

 showery weather, branch freely, and bear a long succession of 

 flowers. 



GOOD HARDY BIENNIALS 



NAME. 



Adlumia cirrhosa 

 Androsace lactiflora 

 Aster Bigelovii 

 Campanula pyramidalis 



,, alba 



Canterbury Bell 



,, ,, Cup and Saucer 



Dianthus Heddewigii 

 Foxglove (Digitalis) 

 Gilia aggregata 

 Michauxia campanuloides 

 Poppy, Iceland 

 Stock, Brompton + 

 Sweet Rocket 

 Sweet William 

 Verbascum olympicum 

 Wallflower 



The Dianthuses are often treated as annuals (see Annuals), and 

 Eschscholtzias are almost always grown as annuals, together with 

 Sweet Scabiouses, although both are biennials. Antirrhinums 

 (Snapdragons) and Pentstemons are admirable when sown in boxes 

 in autumn, wintered in a frame and planted out in spring; they 

 bloom nearly all the following year, thus proving their worth as 

 biennials. Wallflowers become perennial if left, but in regular 

 garden practice it is most convenient to discard old plants after 

 they go out of flower in late spring and raise a fresh supply from 

 seed for the following year. Wallflowers and Snapdragons will 

 thrive in most soils, but they are the best of all hardy flowers for 

 poor limestone. 



Bignonia (bigno-nia, after Abbe Bignon. Ord. Bignoniaceae) . 

 Brilliant hothouse climbers, with compound leaves, well suited to 

 train up the pillars or roof of a large heated house. They are best 

 planted out in a compost of fibrous loam and peat in equal parts, 

 with sand. They are propagated by cuttings of half-ripe side 

 shoots kept close in heat; also by seed and layers. The principal 

 species are magnifica, with purplish-crimson flowers; speciosa or 

 picta, pink; tweediana, yellow; and venusta, orange. Capreolata, 



