Your unknown plant with whorled, deeply lobed leaves was correctly guessed as a delphinium. Leaf structure matches, and the whorled arrangement is characteristic.
Delphiniums produce tall, elongated spikes with numerous flowers. If your plant bloomed after moving to a sunnier spot, compare the flower stalk to delphinium images. For absolute certainty, take a sample to a local garden center.
Delphiniums are perennial favorites for cottage gardens—enjoy the show!
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