Must visit / experience (spring) - Tulips and Wildflowers
Check out the Tulip festival at Araluen Botanic Park (near Perth hills) from end of August to mid September. Entry charges apply.
The park can be a bit busy during this time.
http://araluenbotanicpark.com.au/
Cost: Check website for latest price.
https://www.araluenbotanicpark.com.au/visit-araluen/admission-fees/
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The Kings Park Festival in September, marks the arrival of spring, typically showcases stunning wildflower displays.
Cost - Free
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On wildflowers >
Top tips for wildflower enthusiasts:
TAKE nothing but photos – picking wildflowers is illegal and can attract a $2000 fine.
RESPECT private property / don't trespass.
PROTECT canola crops and prevent the spread of disease by staying out of canola fields.
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Look out for regions where along the way you can view magnificent wildflowers blooming especially early spring
Related:
https://www.westernaustralia.com/en/things_to_do/must_do_and_top_10/pages/top_10_see_wildflowers.aspx#/
http://viewer.e-digitaleditions.com/i/959040-wildflower-guide-2018/10?
https://www.experienceperth.com/page/wildflower-season-perth