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It depends on what area of plant species you are looking at.

In general, the Rafflesia flower can be as large as 39" wide whereas the largest sunflower on record is only 32.5" wide. However, the Rafflesia is a parasistic plant, meaning it gets its nutrients off another host instead of the soil-root system. in my opinion, therefore, I do not consider the Rafflesia a "true flower".

I would also like to mention that the sunflower record for height is 25.5 feet tall, and the record number of flowers on a single plant stands at 837 heads.

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Q: Is the world's biggest flower the Sunflower or the Rafflesia?
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