108 



HORTICULTURE FOR SCHOOLS 



Fio. 78. Leaf type of lettuce. 



within a few weeks. Head lettuce is considered more desir- 

 able. It cannot be grown 

 well under glass since it is 



9 ^^iTi^y^M^^ subject to rot. As head 



lettuce takes long to mature, 

 the seed is sown in flats, 

 and the plants are trans- 

 planted to other flats or 

 pots soon after they come 

 through the ground. They 

 are hardened in the coldframe for a week or two before being 

 transferred to the garden. Head lettuce should be thinned. 

 In some varieties the 

 heads grow to be a foot 

 in diameter. Thorough 

 and frequent cultivation 

 conserves the moisture. 

 Cos lettuce, the leaves of 

 which do not form a com- 

 pact head, is grown in 

 the same manner as head 

 lettuce, but some varieties 

 require blanching of the FlG " 79.-Head type of lettuce. 



inner leaves. This is accomplished by tying the leaves 

 together at the top. 



176. Parsley is able to withstand hot dry weather. Some- 

 times the plants are started under glass, but they are hardy 

 and seed may be sown out-of-doors early in the spring in a 

 carefully prepared seed-bed. As only a portion of the plant 

 is picked at a time, a few individuals will furnish a continuous 

 supply for the average family. Parsley is frequently trans- 

 planted to window-boxes in the fall where it will supply 

 foliage all winter. 



