Robinia 'Hillieri'Enjoy summer afternoons sitting out on the patio, or in the garden, with friends surrounded by the sweetest fragrance. The Robinia x slavinii Hillieri, more commonly known as the Pink Acacia Tree not only has the most amazing scent, thanks to its flowers, but looks the part too. During spring and summer your Pink Acacia Tree transforms into a flurry of pale pink and lilac flowers, which are particularly striking against the gorgeous green foliage.