THE CLASSIFICATION OF VEGETABLES 199 



Group ii. Condimental and Sweet Herbs. 



Dill, mint, sage, savory, tansy, thyme and many others. 

 Group 12. Mushroom. 



Not discussed in this book. It is more generally regarded 

 as a forcing crop. 



CLASS II. PERENNIAL VEGETABLES. 



Artichoke, globe (Cynara scoJymus). 

 t Artichoke, Jerusalem (Helianthus tuberosus). 

 } Asparagus (Asparagus officinalis). 

 Rhubarb (Rheum rhaponticum). 

 Sea kale (Cranibe maritima). 



261. Requirements of the various groups. Root crops 

 (Group i) thrive at comparatively low temperatures. 

 They usually prefer sandy loams, and deep soils are also 

 important for long-rooted crops. Sandy types of soil 

 favor symmetrical development of roots and decrease the 

 percentage of the small, fibrous roots objectionable in 

 this class of vegetables. 



TUBER CROPS. (Group 2.) The sweet potato requires 

 a long season and high temperatures. Sandy soils are 

 preferred. 



BULB CROPS (Group 3) are hardy and may be grown 

 successfully in many soil types, although sandy loams 

 are best. They do not require high temperatures, but 

 the soil must be well provided with humus and available 

 plant food. 



COLE CROPS (Group 4) are hardy and require a cool sea- 

 son, a fertile soil and an abundant supply of moisture. 



POTHERB CROPS. The requirements of the "greens" 

 (Group 5) are variable. (See Chapter XXI.) 



SALAD CROPS (Group 6) are hardy. They require liberal 

 feeding and an abundance of moisture. 



PULSE CROPS. (Group 7.) Soil and weather require- 

 ments vary with each crop 



SOLANACEOUS CROPS (Group 8) are "tender" vegetables 



