290 THE BOOK OF VEGETABLES 



again, the roots may be planted out in spring for use 

 again in the following winter. 



UNICORN-PLANT is Martynia, which see. 



VALERIAN, AFRICAN. African or Algerian Vale- 

 rian, is Fedia Cornucopia?, a somewhat tender annual 

 salad plant, similar to Corn Salad. 



Soil rich and moist. 



Rows one foot apart or more. 



Depth about one inch. 



Sow in May, June and July, successively. 



Thin to nine to twelve inches in the rows. 



Pick the leaves as wanted when the plant is well 

 established or pull the whole plant at about eight 

 weeks. 



VEGETABLE MARROW. See under Squash. 

 VEGETABLE OYSTER. See Salsify. 

 VETTICOST. See Com Salad. 

 VIPER'S GRASS. See Scorzonera. 

 WATER-CALTROP, or 



WATER-CHESTNUT, (Trapa natans) is a hardy 

 and attractive aquatic plant, which bears a fruit or nut 



