This is not 100% clear. My interpretation would be that the Tudor and Stucco do indeed refer to the house, then the writer moves on to describing the garden - but in a sense this is describing the house too. The writer sees the 'rhodedendrons and a perennial garden fading fast' as part of the appearance of the house, then goes on to explain im more detail how the garden is fading: 'losing its pinks and whites and blues' (perennial flowers being those that tend to make a big splash of colour and then die out).
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