Vrikshayurveda -- The Ancient Indian Science of Trees

In 2006, two small tea growers in Golaghat district of Assam, Arijit Bhuyan and Babul Lahkar, tried something unusual on their family gardens. Their tea bushes had become resistant to most chemical pesticides. Red spider mite and helopeltis kept coming back, season after season, no matter what they sprayed. Soil tests showed pesticide residues had built up to the point where earthworms had disappeared.

They began applying a fermented liquid called kunapa-jala. The recipe, written down in Sanskrit a thousand years ago, called for boiled animal waste mixed with sesame oil cake, soaked black gram, honey, and ghee, fermented underground in a clay pot. They followed it as written. Within a few months, the red spider mite was gone. Within a year, the earthworms had returned. The Assam Agricultural University researchers who tested the soil afterwards found that pesticide residues had begun to break down.

The Sanskrit text was Vrikshayurveda -- literally, the Ayurveda of trees -- composed in Bundelkhand around 1000 CE by a court physician named Surapala under the patronage of King Bhimapala. The manuscript itself was sitting unread in the Bodleian Library at Oxford until 1996, when Dr Y.L. Nene of the Asian Agri-History Foundation tracked it down and Dr Nalini Sadhale translated the 325 verses into English. The Hindi translation followed in 2003.

Most of the science is still being rediscovered. Some of it works. Some of it does not. All of it is older than any European botanical text.

Vrikshayurveda is one of those Sanskrit words that is exact when you slow it down. Vriksha means tree. Ayur-veda is the science of life. Together, the science of the life of trees -- the same framework that produced Charaka and Sushruta for human medicine, applied to plants. The earliest references to a science of plants come from the Rig Veda and the Atharva Veda, which name a worm called kapana that destroys leaves, list rodents and borers as crop enemies, and prescribe certain plants as protective. By the time of Varahamihira's Brihat Samhita in the 6th century CE, an entire chapter (chapter 55) is dedicated to vrikshayurveda -- planting, soil, propagation by cuttings, treatment of trees that fail to flower.

Surapala's text is the most complete one to have survived. Its 325 verses run across 13 chapters: salutation to Ganesha, glorification of trees, raising orchards, agri-horticulture, planting near houses, procuring and treating seeds, preparing pits, soil selection, irrigation, finding groundwater, nourishment and fertilisers, plant diseases, plant medicines, garden layout, examination of land for digging wells, and cultivation of grains. Roughly 170 plant species are described.

What makes the text usable today is that it is not philosophy. It reads like a working manual. Surapala tells you how deep to dig the pit (verse-specific to species), what to put at the bottom (cow bones, cow dung, burnt earth), how to treat the seed before sowing (smear with honey and ghee for bulbous roots; smear with cow dung for stone-like seeds), and what to feed the seedling once it sprouts (fresh acrid fish along with milk of the snuhi plant). It is granular like an Excel sheet. The chemistry behind it is, in many cases, defensible.

The verse looks like an arithmetic of devotion, but it is doing something stranger. By placing one tree above ten sons, Surapala is making a deliberate moral inversion -- a culture that genuinely valued sons (with the patrilineal weight that carried in 11th-century Bundelkhand) is being told that planting a tree exceeds that. The same arithmetic appears in Matsya Purana chapter 154, in Devi Parvati's voice, where it forms part of an explicit explanation of why dedicating a tree as one's spiritual son is meritorious. The logic is not sentimental. A son lives perhaps eighty years and serves one lineage. A tree lives several centuries and serves every species that crosses its shade. Surapala uses this verse to open his text because the entire science that follows -- soil, water, manure, disease, healing -- is written for an audience that already accepts the premise.

The practical consequence is visible in the medieval landscape. Across most of inhabited India, villages had a fixed roster of grama-vrikshas -- the village's own trees, planted and protected by named families across generations. Banyan, peepal, mahua, neem, tamarind, jamun. Some still stand. The 600-year-old peepal at Sarnath, the great banyan at Pillalamarri (Telangana, around 700 years old), the Mahua tree groves of Chhattisgarh -- these are not accidents. They are the surviving fragments of a system that took dasha-putra-samo-drumah seriously enough to plant for a great-grandchild who was not yet born.

The chapter on plant disease in Surapala (verses 165-217) is where the science gets unexpectedly precise. Diseases are classified by the three doshas of Ayurveda transferred onto plants: vata-roga (drying, wilting, brittleness), pitta-roga (yellowing, scorching, oozing), kapha-roga (rotting, fungal growth, sliminess). The framework is humoural in name and has none of the modern microbial vocabulary, but the symptoms are recognisable to any agricultural extension officer today. Surapala's treatments use specific plant decoctions -- vidanga (false black pepper), yashtimadhu (liquorice), turmeric, garlic, and a few others -- many of which have since been confirmed in modern lab studies as having actual antifungal or antibacterial activity.

The most thoroughly studied of his prescriptions is kunapa-jala, the fermented liquid manure. Verse 101 lists the ingredients in the order of preparation: animal excreta, bone marrow, brain, flesh, and blood, mixed with water and stored underground. Verse 102 expands the source list -- if not boar, then ram, goat, or other horned animals; verse 103 adds husk to the mixture before sealing. Later verses prescribe variations for specific trees: dates, jackfruit, bilva, plantain, citrus, and the pleasure-flowers of the royal garden each get a slightly different recipe. The active mechanism is fermentation. Anaerobic decomposition of organic nitrogen produces ammonium-rich liquid with a microbial population that, when applied to soil, both fertilises and out-competes pathogens. Modern labs have measured nitrogen, phosphorus, and potassium content in kunapa-jala prepared by Surapala's method, and the readings come in close to commercial NPK fertiliser ranges, with the difference that the kunapa-jala also delivers a working microbial inoculum.

Surapala's tenth chapter, vichitra-adhyaya or chapter of botanical wonders, is where modern readers should read with the most care. He prescribes methods to make plants flower out of season, change their colour, produce fruit at unusual times, or shrink to half their normal size. Some of these are recipes for what would today be called horticultural manipulation -- light blocking, hormonal trigger by specific plant decoctions, root pruning, controlled stress. Others read like fairy tale. The challenge is that without controlled experiment, the two are hard to tell apart.

Dr Y.L. Nene's group at the Asian Agri-History Foundation has been running comparative trials since 1999. Some of Surapala's seed treatments produce statistically significant improvements over untreated controls. Some do not. The point of the work is not to vindicate ancient claims wholesale or dismiss them wholesale -- both reactions are emotional, and both are wrong. The point is to do what Surapala himself would presumably have wanted -- read carefully, test honestly, keep what holds up, and put aside what does not.

This is the same standard you would apply to any other thousand-year-old technical manual. It happens to be written in Sanskrit. Its dating is contested -- some scholars place Surapala in the 7th century, others in the 10th, and at least one tradition associates the name with several authors across centuries. None of that affects whether kunapa-jala helps an Assam tea garden recover. The Golaghat farmers did not need to settle the historiography first.

Today, three streams of work meet at this old text. The first is academic -- universities, the Asian Agri-History Foundation, ICAR, and a few state agricultural research stations doing controlled studies on specific Vrikshayurveda treatments. The second is craft-revival -- small organic tea growers in Assam and Darjeeling, coffee estates in Karnataka, paddy farmers in the Cauvery delta, who simply use the text as a working manual. The third is policy. India's Paramparagat Krishi Vikas Yojana, launched in 2015, formally recognises traditional agricultural inputs including jeevamrit, bijamrit, and panchagavya. Most of these are direct descendants or simplifications of formulations described in Surapala. Sikkim, the world's first fully organic state since 2016, draws extensively on this same lineage.

Not every modern claim about Vrikshayurveda holds up. The text does not predict modern genetics, does not anticipate Mendel, and does not contain a Sanskrit version of Watson and Crick. What it does contain is a thousand-year-old framework for how to read a plant -- by leaf colour, root pattern, soil type, season, and disease symptom -- and how to act on what you read. Some of those readings have been tested and survive. Some have not. Some never will. None of that changes the fact that someone in 11th-century Bundelkhand was already asking the right questions.