Verified answer

Waratah grow naturally in the central coast and nearby mountains

of New South Wales which would have similar temperatures to Perth.

They like a well-drained friable soil of good texture, and do not take

kindly to over-watering on heavy soils. They should be watered in hot and dry spells. They enjoy semi shade, or at least shade from the

afternoon sun. Fertilizer rich in nitrogen (blood and bone) should be

applied once a year in spring.

The various types of Waratah make a good show in gardens, and

many are cultivated commercially for cut flowers.

Protea would also do well in your area. They originate in Australia, Africa and South America. They need acidic soil and are prone

to mildew, so should not be watered in the evening to avoid this.

Protea are also cultivated commercially for their flowers, especially

in Hawaii, from where they are exported world-wide.

Both Waratah and Protea do well with mulching to keep their roots cool.

Hope this helps.