Save The Crabs - Then Eat Them!
The "Save The Crabs, Then Eat Them" campaign, as part of the South West Catchment Council's "Home River Ocean" program, encourages urban gardeners not to fertilise in winter when the fertiliser is most likely to leach and run off into waterways.
Excess nutrients in waterways lead to algal blooms that remove oxygen from the water when they break down and threaten wildlife and fish communities.
Fertilising in spring, rather than winter, also saves time, effort and money for the home gardener. Most lawns are warm season grasses and stall their growth in winter. Nutrients are absorbed more easily in spring and this is when many plants start their new growth cycles.
So, like the campaign says, hold off on the fertiliser till spring!