ISO 



THE CULTURE OF POT- PLANTS 



in the conditions, they cease to make growth and form flower- 

 buds instead ; but, as a rule, the change — usually increasing 



J tuber 



rhixome 



Fig. 5&. — Corm, Tuber, and Rhizome. 



heat and drought, or it may be increasing cold — becomes too 

 much for their further development, and instead of opening 

 their buds at once, they go to rest for a time, and do not 

 spend, until the following season, the material which would 



