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The following have gained the Royal Horticultural Society 's Award of Garden Merit : - Helenium Hybrid has brilliant yellow petals surround spherical brown cones covered with golden pollen .
 Royal Horticultural Society
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Royal Horticultural Society