Leucanthemum x superbum.
Another favourite amongst Australian gardeners, the Shasta Daisy offers big beautiful white and yellow flowers that are long lasting throughout summer and autumn.
This hardy, easy to grow perennial enjoys a full sun / part shade position in well drained soil. I find the hot Perth summers can sometimes burn the leaves if planted in direct sun.
The plant should grow to about 80cm high by 65cm wide and it is great for helping to attract pollinating insects into the garden.