Yes, the noun waratah is a common noun, a type of plant.
A proper noun is the name of a person, place, thing, or a title; for example:
The Australian Waratah is red.
The Waratah Anemone is on the rocky waters of Australia
Waratah Cup was created in 1991.
The waratah has red flowers and dark green leathery leaves.
Waratah railway station was created in 1858.
Waratah Football Club was created in 1917.
Waratah Mayfield Cheetahs was created in 1927.
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The waratah, Telopea speciosissima, is the state flower of New South Wales.
The area of Waratah-Wynyard Council is 1,187 square kilometers.
Common noun
The Waratah grows in the state of New South Wales and is that state's floral emblem.