This is a theme puzzle with the subject stated below. Find the listed words in the grid and when you have completed the puzzle, there will be letters left over. They spell out the alternative theme of the puzzle.
A native garden
Solution: 27 letters
Acid Annual Banksia Bed Biennial Bract Bunya Callistemon
Cane Dryandra Fern Foliage Frost-hardy Fruit Gum Gymea lily
Gypsum Habit Hothouse Humus Income Insect Leggy Leptospermum
Lime Loam Manure Micro Mulch Organic Plant Scent
Soil Soluble Wollemi pine