This type of puzzle is called "Rows Garden," which is appropriate, as you will be passing rows of gardens en route to the cache.
Words are entered in the grid in two ways. The Rows are labelled A to F, and stretch across the grid horizontally. Rows consist of two consecutive answers reading left to right (Rows A and F only contain one answer). The clues for Rows are given in the order the answers appear in the grid.
The Blooms are six-letter answers that are entered in the coloured hexagons. You have to determine the starting space for each Bloom, and whether the answer will be entered clockwise or counter clockwise. Clues are given according to the colour of Bloom, but clues for each colour of Bloom are given in random order. Use the Row answers to figure out where to plant each Bloom.
Once you have filled in the grid, read the numbered letters in order to get directions from the posted coordinates, UP the path, past the gardens, to the cache.