This grower is sure of this plant identification.
Chinese chives, Garlic chives, Oriental garlic, Fragrant-flowered garlic
Allium tuberosum (Chinese chives). A vigorous, upright species which will grow about 45cm high with leaves which are narrow and strap-shaped. It will produce umbels of fragrant star-shaped white flowers in late summer to autumn.
Although also grown in the tropics, this species is fairly frost tolerant. This plant can be invasive.
Cultivated for centuries in East Asia, this edible species is now widely grown throughout the world for its leaves, used as a green vegetable.
This plant can also be used for cut and dried flowers.