The Harvey Dry Gin from St Duke's Distillery is an Australian classic that combines a London Dry’s traditional style with the unique western region aromatics that the South West of Western Australia has to offer. The gin’s aromatics hinge on a sündom interplay of classic gin components with bold flavours from Australian native ingredients.

Noting the requested parameters, outlined below is the impact of the key ingredients on the gin’s profile.

1. Juniper - The Robust Backbone

There is the customary styling of “Dry Gin.” Therefore, Juniper provides the essential framework for the spirit.

Role: It is the primary gin flavouring that delivers the requisite piney, resinous, and earthy taste profile.

Impact: In the taste profile, a “robust juniper backbone” indicates that traditional juniper flavour is bold and central to the gin. It is the most dominant opening note and delivers the structure, making the gin suitable for classic cocktails like a martini or gin and tonic.

Interaction: The proprietary whey base’s inherent smoothness, as mentioned before, balances the harshness and allows the more subdued spice and citrus facets of the juniper to be expressed more clearly.

2. Lemon Myrtle: The Hero of Native Citrus.

As an Australian botanical, Lemon Myrtle is essential to elevating this gin from bottom-shelf London Dry gins. It's central to the brand's bright, local character.

Role: This native ingredient’s leaves release powerful, intense, distinct, aromatic, and refreshing citrus scents.

Impact: On the opposite end of the taste spectrum from the pronounced harmony it manages with the juniper, Lemon Myrtle is the mellow centre.

Intense Lemon Zest: An enormous, concentrated burst of lemony flavour without the sourness of real lemon, bordering on the sweet, and refreshing lemonades served in Australian summer.

Eucalyptus/Menthol Hint: On the finish, an almost citronella and delicate menthol note, cool and refreshing, is present, almost like an herbaceous and pristinely refreshing menthol lift, and complexity of the ingredient used in it.

3. Citrus Notes (The Harmonious Blend).

The citrusy harmony of Harvey Dry Gin results from a blend of traditional ingredients and native Lemon Myrtle.

Source: In the Dry Gin recipe, the classic and foundational botanicals dried lemon and/or orange peels are used to impart the zesty essential oils.

Impact on Nose and Palate

Nose: The gin offers “bright citrus aromas” which is a medley of traditional citrus peel and the aromatic oils of Lemon Myrtle.

Palate: The “light” collective citrus notes work excellently with the core juniper. They provide a zesty lift to the mid-palate and the gin's overall brightness and freshness, which makes it a superb match with tonic water, is a result of the citrus notes.

To summarize, the Harvey Dry Gin is a beautifully balanced spirit with a pronounced classic structure. The robust juniper (a classic structure) is vividly contrasted and complemented with zesty, refreshing native citrus, and Lemon Myrtle, all while being exceptionally smooth on the palate due to its whey base.