Passage Summary: Since real green flowers are hard to find, florists should buy cheap white ones and dye them green for St. Patrick's Day.

Conclusion: Florists should prioritize purchasing white carnations before St. Patrick's Day because they are affordable and easy to color.

Reasoning: Natural green carnations are extremely rare and difficult for breeders to produce, whereas white carnations are inexpensive and can be easily dyed green to meet holiday demand.

Analysis: To identify the conclusion, look for the recommendation at the end of the passage. The word 'then' serves as a conclusion indicator, signaling that the florist is moving from facts about flower rarity to a specific piece of business advice. The earlier sentences provide the background context and the 'why,' while the final sentence provides the 'what should be done.' Focus strictly on the structure here; we are not concerned with whether this is actually a good business strategy.