Because it requires a mild climate in which Frost does not occur and that the drop in temperature is sporadic, with weak frost.
Although it describes how deciduous, actually behaves like perennial ( it is what they call semi-perennial or semicaducifolia, as ) look.
Its kind Jacaranda mimosifolia is deciduous temperate arriving spring, as other tropical species.
Because in winter the jacaranda loses all its leaves.