HISTORY AND EVOLUTION 37 



so that the plants in pots do not become 

 tall enough to require much support. The 

 usual practice is to plant these pot-clumps 

 twelve to eighteen inches apart in the row. 

 The entire potful is planted without dis- 

 turbing the twigs supporting the plants. 

 It is better to pick out the crock from the 

 ball since it loosens the tips of the roots 

 which, when planted, are encouraged to 

 strike down into the soil. Sometimes, the 

 roots are long, and therefore are wound 

 around the ball of earth in the pot; if they 

 are not loosened, they may continue to 

 grow in the same manner, thus not estab- 

 lishing connection with the soil prepared 

 for the plants. It is essential to keep the 

 roots growing down into the cooler, 

 moister soil. No difficulty will be experi- 

 enced in planting sweet peas from pots, 

 provided they have been given a good 

 watering the day before planting, which 



