Palo Santo: The Holy Wood of South America

A Note from Sindy

Palo santo is one of the most distinctive woods I work with. Most aromatic woods are heavy — they ground a space downward, settle the body, slow the breath. Palo santo does something else. It grounds and lifts at the same time. There is a brightness to it — a citrus shimmer riding on top of the warm wood base — that no other resinous wood I know carries in quite the same way. This is the molecular signature of an unusually limonene-rich oil, and it is what makes palo santo so beloved by people who want grounding without sedation.

This page is the deep-dive — what I know about Bursera graveolens after years of working with this oil, drawing on peer-reviewed research, the cultural history of palo santo's traditional use across Andean and Amazonian Indigenous nations, and direct experience with the wood. It is also the page where I want to be clear and honest about the sourcing concerns that surround palo santo in the wellness market today, and what we do differently.

The Tree: Bursera graveolens

Palo santo — botanically Bursera graveolens, meaning "heavy wood" in Latin — is a small to medium-sized tree native to the dry tropical forests of the Pacific coast of South America. It grows wild from southern Mexico down through Ecuador, Peru, and parts of Argentina, with the most aromatic and commercially valued populations concentrated in the coastal dry forests of Ecuador and northern Peru. The tree is closely related to frankincense and myrrh — all three belong to the Burseraceae family of aromatic resin-producing trees — which is why palo santo's scent carries notes that fragrance perfumers describe as somewhere between a soft frankincense and a warm cedar.

What makes Bursera graveolens unusual is that the aromatic chemistry of the heartwood develops only after the tree dies. Living palo santo wood is not particularly fragrant. After a tree falls naturally — from age, storm, or disease — the heartwood undergoes a years-long maturation process in which oils and resins concentrate and complex aromatic compounds develop. Traditional harvesting practice waits at least four to ten years after the tree falls before collecting the heartwood, and the most prized palo santo wood has aged on the forest floor for considerably longer. This natural aging is what gives palo santo its characteristic depth and sweetness.

The essential oil is extracted from this aged heartwood through steam distillation. The process is slow — the wood is dense and yields only a small amount of oil — which is part of why true palo santo oil has historically commanded premium prices among perfumers and aromatherapists.

Sacred Use Across Indigenous Cultures

Palo santo holds deep ceremonial significance across many of the Indigenous nations of the Andes and the western Amazon. Quechua-speaking peoples of the highland regions of Peru, Ecuador, and Bolivia have used palo santo in ceremony for centuries. Shuar and Achuar peoples of the eastern Amazon foothills have their own long traditions of use. The Spanish name palo santo — "holy wood" — was given to the tree by Spanish colonizers who observed its central role in Indigenous spiritual practice, but the tree was sacred long before it had a Spanish name.

Across these traditions, palo santo wood has been burned to mark transitions, support contemplative practice, accompany healing work, and clear what is sometimes called energetic heaviness from a space. The smoke from the wood is considered protective and clarifying. In some Shuar and Achuar practices, palo santo accompanies plant medicine work as a supportive aromatic. In Quechua highland tradition, it has been used in offerings and in ceremonies marking seasonal change.

I want to be clear about what our spray is and is not. Our Palo Santo Ritual Spray is inspired by these traditions — it is not a substitute for them. The ceremonial use of palo santo wood is a culturally specific practice with its own protocols, its own teachers, and its own context. A botanical room spray is a different thing: a tool for daily ritual that honors the lineage without claiming to participate in it. Customers from these traditions, and customers who simply want to live with the scent of palo santo in their homes, are both welcome here — but we make this distinction clearly so that the cultural heritage is respected for what it actually is.

Aromacology: The Science Behind the Scent

Most people experience aromatic plants as something that simply makes them feel good. The reality is more interesting.

There is a field called aromacology — the scientific study of how aromatic compounds affect mood, cognition, and physiology. It is distinct from aromatherapy, which is the practice of using aromatic compounds for wellbeing. Aromacology asks the underlying question: what is actually happening when we inhale these molecules? What measurable changes occur in the body and brain?

The answer, increasingly, is: a great deal. Aromatic compounds are volatile by nature — they evaporate easily, which is what allows them to reach the olfactory receptors at the top of the nasal cavity. From there, signals travel directly to the limbic system, the part of the brain that governs emotion and memory. Unlike most sensory inputs, smell does not pass through the thalamus first — it goes straight into the emotional centers of the brain. This is why scent can shift mood faster than almost any other sensory experience.

Aromacology has shown that the effects go beyond memory and emotion. Specific aromatic compounds bind to specific receptors in the brain and body. They modulate neurotransmitter activity. They influence the autonomic nervous system. They affect cortisol levels, heart rate variability, and sleep architecture. These are measurable, peer-reviewed effects — not mystical claims. Palo santo, as it turns out, contains one of the most-studied aromatic compounds in the entire field.

The Chemistry of Palo Santo

Palo santo essential oil is dominated by a single compound to an unusual degree. Most essential oils are complex blends of dozens of compounds in roughly balanced proportions. Palo santo is different — it is more like a high-purity limonene oil with a supporting cast of other terpenes. This single-compound dominance is part of what gives palo santo such a clean, characteristic scent profile.

Limonene — The Featured Compound

Limonene typically makes up 60-80% of palo santo essential oil — an extraordinarily high concentration. For comparison, lemon oil is about 60-70% limonene, and orange oil is around 85-95%. Palo santo is the rare non-citrus oil with a citrus-fruit-level limonene profile. This is why palo santo has that bright, sunlit, almost citrus-fruit-like top note that distinguishes it from heavier woods like cedar or sandalwood. Peer-reviewed research has documented limonene's measurable effects on mood, including reductions in anxious feelings, improvements in self-reported mood scales, and supportive effects on the body's natural stress response through A2A adenosine receptor pathways in the brain. Limonene is also one of the most extensively studied terpenes in essential oil research, with documented antioxidant and anti-inflammatory properties at the cellular level.

α-Terpineol

α-Terpineol is the second major compound in palo santo, typically 5-15% of the oil. It contributes a soft, floral-pine quality that rounds out the bright limonene character — adding warmth and depth where pure limonene would feel sharp. α-Terpineol has its own body of research documenting calming and sedative effects, which complements the mood-elevating effects of limonene. Together, these two compounds create palo santo's signature "grounding-yet-uplifting" character that is so difficult to describe but immediately recognizable when you smell it.

Carvone and Trace Aromatics

Smaller amounts of carvone, menthofuran, and several other minor terpenes round out the profile. None of these is present in large enough concentration to define the scent on its own, but together they create the complexity that distinguishes true Bursera graveolens oil from cheap synthetic palo santo fragrance reconstructions. A trained nose can tell the difference instantly — synthetic palo santo always smells flat compared to the real thing.

What the Research Shows

Limonene — palo santo's dominant compound — is one of the most clinically studied terpenes in modern aromatherapy research. Peer-reviewed studies have documented measurable effects on mood, stress markers, and certain behavioral measures in both animal models and human inhalation trials. The proposed mechanism involves limonene's interaction with A2A adenosine receptors in the brain, a pathway involved in regulating arousal, anxiety, and reward.

Specific to palo santo oil itself (as distinct from isolated limonene), the published research base is smaller — palo santo has been studied less rigorously than lavender, peppermint, or bergamot. What can be said with confidence is that the chemistry is well-understood, the mechanistic foundation is strong, and the centuries of traditional Indigenous use represent a meaningful kind of empirical knowledge.

I do not make claims that palo santo treats any disease or replaces any medical or mental health care. I am a craftsperson and a researcher, not a clinician. What the research and tradition together suggest is that palo santo contains a compound with documented mood-supportive effects, in a botanical context that has been honored across cultures for centuries — and the spray exists as a tool for daily ritual and atmospheric reset. The science is what gives me confidence that the ritual is doing something real.

Ethics, Sourcing, and the Sustainability Question

Palo santo has a sustainability problem in the global wellness market, and I want to address it directly because customers deserve to know.

Over the past two decades, demand for palo santo has exploded — driven by yoga and wellness culture in North America and Europe, by Instagram aesthetics, by the smudging-alternative market. The supply of naturally fallen, properly aged Bursera graveolens wood has not been able to keep up. This has created several problems.

First, some unethical harvesters cut down living trees to meet demand. This is genuinely damaging — Bursera graveolens grows slowly, the wood needs years to develop its aromatic character after the tree dies naturally, and cutting living trees both kills the tree and produces inferior wood. Living-cut palo santo is not the real thing, and harvesting it undermines the long-term viability of the species.

Second, palo santo's popularity has led to confusion with an entirely different tree — Bulnesia sarmientoi, a South American hardwood sometimes called "Argentine palo santo" or "palo santo wood" in the lumber and incense trade. Bulnesia sarmientoi is a different genus, a different family, and is genuinely endangered (CITES Appendix II listed). Some products marketed as palo santo on the global market actually contain Bulnesia sarmientoi wood. This is one more reason to verify your source: the species you want is Bursera graveolens, full stop.

Our palo santo is sourced from suppliers committed to traditional sustainable practice — only naturally fallen wood, properly aged, from Bursera graveolens specifically, harvested under Ecuadorian regulatory frameworks designed to protect both the species and the people who steward it. We pay more for this. We accept lower margins. We believe it is the only honest way to be in this market.

The House of Botanicals is a proud Business Member of United Plant Savers, the leading nonprofit working to protect at-risk medicinal and aromatic plants. Palo santo is on the global watch list. We would rather sell less and source genuinely than scale a brand by participating in the depletion of a sacred tree.

A Final Word

Palo santo is, to me, one of the more remarkable aromatic woods on Earth — and one of the more endangered, both ecologically and culturally. The tree itself faces real threats. The traditions that have stewarded it for centuries deserve real respect. The chemistry behind its scent is genuinely beautiful — that high-limonene profile delivering grounding and lift in a single molecular signature. Every time I formulate a batch of Palo Santo Ritual Spray in my Colorado studio, I am thinking about the dry coastal forests of Ecuador, the harvesters who collect the fallen wood with patience and care, and the Indigenous nations whose relationship with this tree gave the world the wisdom to use it well.

If you choose to bring palo santo into your life, I hope it serves you the way it has served Andean and Amazonian peoples for centuries — as a presence in the room, a quiet anchor, a moment of transition between what came before and what comes next.

— Sindy Wise

Ready to experience palo santo for yourself? Shop the Palo Santo Ritual Spray

More about Sindy — founder, certified aromatherapist, and herbalist behind The House of Botanicals.