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Kamran Maman, 36, was attacked by a group of 12 men in Slough, Berkshire, on 18 May.
BBC: Kamran Maman killing: Police arrest four more people
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Hamilton, 52, launched the attack with the 14ft (4.2m) sunflower after police were called to her home near Slough, Berkshire, last September.
BBC: Model Paula Hamilton fined for sunflower police assault
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The 40-year-old man was arrested at around 06:00 BST on Wednesday at his home in Slough, Berkshire, by police working on Operation Elveden.
BBC: New Scotland Yard sign