84 CULTURE OF THE SWEET PEA 



half to four feet high, they should all be- 

 gin to bud. At this time the temperature 

 should be raised every night by one or two 

 degrees. If the temperature averages 44 

 degrees F., make it 45 degrees the next 

 day, and so on until 52 is reached. This 

 is the highest and safest temperature for 

 the older winter grandifloras at night. 

 When in bloom, the temperature may be 

 raised to 60 degrees F. during cloudy days 

 and 68 during bright days. All the new 

 Winter Orchid-flowering sweet peas in the 

 first stage need the same treatment as that 

 just described above. But as these begin 

 to bud and flower the temperature should 

 be raised to ^^ degrees F. at night, 60 to 

 65 for cloudy days, and 70 to 72 during 

 bright days. This higher temperature is 

 necessary for the new strains, as the flowers 

 are larger and the number to a single stem 

 correspondingly more numerous"; the addi- 



