Juniper berries are the defining flavor of gin, and by law, they have to be. The European Union defines gin as “a juniper-flavoured spirit drink produced by flavouring ethyl alcohol of agricultural origin with juniper berries,” with a minimum strength of 37.5% alcohol. But juniper is just the starting point. Most gins contain a carefully chosen mix of plants, seeds, roots, and peels, collectively called botanicals, that layer complexity on top of that signature piney backbone. How those botanicals are selected, sourced, and extracted during distillation is what separates one gin from another.
Juniper: The Required Foundation
Juniper berries look like small, dark blueberries, but they’re actually the seed cones of an evergreen shrub. Their essential oil is dominated by a compound called alpha-pinene, which accounts for roughly 51% of the oil’s composition in well-studied Bulgarian berries. Alpha-pinene is what gives gin its classic pine and resinous aroma. Smaller amounts of myrcene (about 8%) add a woody, slightly balsamic quality, while limonene (around 5%) contributes a subtle citrus lift even before any citrus peel is added to the recipe.
With more than 100 volatile compounds packed into each berry, juniper flavor isn’t one-dimensional. And it changes depending on where the berries grow. For decades, Tuscan juniper was considered the gold standard for gin production. More recently, berries from Macedonia and Albania have gained recognition for their distinct profiles. The levels of key aromatic compounds shift with altitude, latitude, rainfall, and temperature because the chemicals that create flavor are part of the plant’s response to its environment. A Dutch distiller called Origin Gin has explored this directly, producing separate batches using juniper from specific regions, from cool, rainy Meppel in the Netherlands to warmer Arezzo in Italy, to highlight how terroir shapes the final spirit.
Coriander, Citrus, and the Supporting Cast
After juniper, coriander seed is the most common botanical in gin. Its flavor profile bridges the gap between juniper’s resinous punch and the brighter citrus notes many gins are known for. Coriander seeds taste fresh, sweet, and aromatic with citrus, warm, spicy, and minty tones. The compound responsible for most of that character is linalool, which typically makes up 60 to 70% of the seed’s essential oil. Interestingly, linalool concentrations increase when coriander plants grow in drier, hotter conditions, meaning the same seed variety can taste different depending on its growing season.
Citrus peels, usually lemon, orange, or grapefruit, are another near-universal ingredient. They provide the bright, zesty top notes that hit your nose first when you open a bottle. Some distillers use fresh peel, others use dried, and the choice affects how sharp or mellow the citrus reads in the finished gin.
Beyond these core ingredients, recipes diverge dramatically. Common additions include cardamom for warmth, cassia bark for a cinnamon-like spice, cubeb pepper for a mild heat, almonds for a faint nuttiness, and liquorice root for sweetness and body. Some distillers use as few as four or five botanicals. Others work with twenty or more.
Why Roots Matter More Than You’d Expect
Two roots play a quiet but critical role in many gin recipes: angelica root and orris root (from the iris plant). Neither one is meant to grab your attention on its own. Instead, they act as fixatives, binding and prolonging the flavors of the other, more volatile botanicals so they hold together as a cohesive whole rather than fading quickly or clashing. Orris root is particularly valued for this quality. It helps create a smoother, more integrated gin where the juniper, citrus, and spice notes feel like a single experience rather than a list of separate ingredients.
How Distillation Shapes the Flavor
The same set of botanicals can produce noticeably different gins depending on how the distiller extracts their flavors. The two primary methods are maceration and vapor infusion, and many distillers use a combination of both.
In maceration, botanicals are soaked directly in the base spirit before or during distillation. This retains much more of the botanical oils, producing a bigger body, a fuller mouthfeel, and more pronounced, dense flavors. It’s the traditional approach and tends to yield a bolder, more robust gin.
Vapor infusion takes a lighter touch. Instead of soaking in liquid, the botanicals sit in a basket above the spirit. As alcohol vapor rises and passes through them, it picks up aromatic compounds more gently. The result is a lighter overall body with more delicate extraction. The same botanical processed through vapor infusion at a lower temperature produces a distinct but softer flavor with a lighter footprint compared to maceration.
Some modern distillers have pushed further with vacuum distillation, which lowers the boiling point so botanicals can be distilled without the heat that “cooks” them. This preserves especially fragile aromas, like fresh flowers or herbs, that would break down under conventional temperatures. Rotary evaporators, ultrasonic vibration-enhanced maceration, and supercritical fluid extraction are other high-tech approaches now appearing in craft distilleries.
The Base Spirit Isn’t Neutral
Gin starts with a base spirit, and while it’s often described as “neutral,” the raw material it’s made from leaves a subtle but real fingerprint on the final product. Both the base spirit and the distilling method make a significant difference to the flavor profile and texture.
Wheat, one of the most common bases since the 20th century, contributes soft vanilla flavors. Rye is one of the most evident character bases, infusing strong spicy and peppery flavors. Grain-based spirits generally bring creamy, earthy, peppery tones with a buttery texture. Grape-based spirits take gin in a different direction entirely, carrying rich, vibrant aromatic flavors with a silky, velvet-like mouthfeel that’s easy to recognize as the spirit glides across the palate. Apple and other fruit bases similarly let fruit character carry through into the finished gin.
London Dry vs. New Western Styles
Traditional London Dry gin is juniper-forward by design. Under U.S. regulations, the “London” designation requires that the gin be made exclusively by original distillation or redistillation, with no artificial flavors added afterward. The result is a clean, dry style where juniper and its piney, resinous character clearly lead.
The category now called New Western or contemporary gin takes a fundamentally different approach. Rather than building everything around juniper dominance, these gins emphasize a wider variety of botanicals and aim for a more balanced, often experimental profile. Juniper is still present (legally, it must be), but it plays a supporting role alongside floral, citrus, herbal, or spiced notes. This is the space where you’ll find gins flavored with everything from cucumber and rose petals to seaweed and native Australian plants. The style has driven a surge in craft gin production, giving distillers room to make juniper more subtle and let other ingredients take the spotlight.
The flavor of any gin, then, comes down to a chain of choices: which juniper and where it grew, which supporting botanicals to include, whether to macerate or vapor-infuse them, how much heat to apply, and what base spirit sits underneath it all. Small shifts at any point in that chain ripple through to the glass.