62532
In short rotation coppice ( SRC ) agriculture , fast growing tree species like willow and poplar are grown and harvested in short cycles of three to five years .
 willow, poplar
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 willow, poplar