Safecracking

by Corey Plover, with help from Craig Kasper and Paul Melamud

ANSWER: SPY

The completed Rows Garden puzzle is:

The initial letters of the bloom clues spell SPIN THREE DIALS, CREATE NEW WORDS and TOP LETTERS. Searching the grid, there are three blooms (ILLEST, PATTEE and RELAYS) which can be rotated to form new words (STRANGEST / MILLIARY, UNSEPARABLE / UNSETTLED and UNDERPAYS / SNARLER respectively:

Taking the top letters as instructed spells the answer SPY.