Hi Peter,
well the answer would depend on whether you just bought the place, as if that is the case, such expenses would be seen as capital improvements... if you owned the IP & had tenants in it, then you should be able to claim for all the expenses (fertilisers, lawn seeds, tools, etc.)... Remember, I'm no accountant, just relaying what my accountant said to me some time ago for a similar situation...
Cheers,
MannyB.