A shrub that is vigorous and showy in your neighbour's garden will turn out scrawny and dull in yours. Nice plants are easier to pull out than weeds. The heaviest frost of the winter will occur on the first night that you forget to cover a tender plant. If spraying is carried out in calm conditions, weedkiller will be blown towards the shrubs but insecticide will be blown back in your face. A cricket ball will attain maximum velocity as it hits the glasshouse.
Cats find newly planted seed beds superior to kitty litter.
Stray livestock will always eat the most desirable plant first. Dwarf eucalypts will turn out to be forest giants and windbreak plants will turn out to be prostrate varieties. Weeds can never be eradicated, only changed in form. For every pest you can see there are a hundred you can't. The unusual form with large crimson flowers will turn out to be the common form with insignificant white flowers.