# Plant Monograph: Paw Paw
**Name of plant:**
Paw paw
**Catch phrase (Carmina Gadelica or traditional invocation if available):**
No Carmina Gadelica invocation is associated with Paw Paw. No widely documented traditional invocation specific to *Asimina triloba* is known. A suitable descriptive phrase is: **“The northern custard apple.”**
**Family:**
Annonaceae — the custard-apple family
**Genus and species:**
*Asimina triloba* (L.) Dunal
**Other names:**
* Pawpaw
* American pawpaw
* Common pawpaw
* Hoosier banana
* Indiana banana
* Kentucky banana
* Ozark banana
* Michigan banana
* Prairie banana
* Custard apple
* False banana
* Poor man's banana
* Papaw
* *Asimina triloba*
**Brief introduction:**
Paw Paw is a deciduous North American tree notable for producing the largest edible fruit native to the continental United States. It grows naturally in rich, moist bottomlands, floodplains, woodland margins, and understories from the Great Lakes region southward through the eastern and southeastern United States. Its large, tropical-looking leaves and unusual purple-brown flowers give the tree an almost exotic appearance despite its temperate North American origin.
The ripe fruit has soft, custard-like flesh with a flavour often described as a mixture of banana, mango, melon, and vanilla. Paw Paw has a long history as a food plant among Indigenous peoples and later European-American communities. The seeds, leaves, and unripe fruit contain **annonaceous acetogenins**, compounds with potent biological activity; consequently, medicinal use of paw paw requires considerably more caution than its delicious fruit might suggest.
**Traditional uses:**
* Ripe fruit eaten fresh as a seasonal food
* Fruit used in puddings, preserves, baked goods, and other preparations
* Paw Paw fruit traditionally gathered from wild trees in late summer and early autumn
* Leaves and bark were used in some Indigenous and folk-medicine traditions
* Seeds and other plant material were used historically in folk preparations, although these uses are not considered appropriate for casual self-medication
**Historical use:**
* Indigenous peoples of eastern North America harvested paw paw fruit as an important seasonal food
* Paw paw was encountered and recorded by European explorers and settlers during the early history of the eastern and southeastern colonies
* The fruit became incorporated into Appalachian, Ozark, and Midwestern food traditions
* Paw paw was used as a wild food during periods when cultivated fruit was scarce or unavailable
* Folk medicine made use of bark, leaves, and other plant parts, but these medicinal traditions are considerably less well established than the plant's use as food
**Parts used and method of use:**
* Ripe fruit pulp
* Historically, bark, leaves, seeds, and roots have also appeared in folk medicine; these parts are **not recommended for unsupervised internal use**
Used as:
* Fresh ripe fruit
* Cooked fruit in desserts, preserves, and puddings
* Pulp incorporated into beverages and other foods
* Historically, preparations of bark or leaves were made as folk remedies, but these should not be treated as equivalent to the safe culinary use of ripe fruit
**Use in healing (modern herbal practice):**
* Paw paw fruit can provide dietary carbohydrates, fibre, vitamin C, and various minerals and phytochemicals
* Paw paw extracts have been investigated experimentally for antimicrobial activity
* Annonaceous acetogenins have attracted research interest because of their cytotoxic effects against cultured cancer cells
* Extracts and individual acetogenins have been investigated as potential insecticides and pesticidal compounds
* Despite considerable laboratory interest, paw paw is **not an established clinical treatment for cancer or other serious disease**
**Pharmacology and biochemistry:**
* **Annonaceous acetogenins** — a large group of polyketide-derived compounds characteristic of the Annonaceae
* **Asimicin** — a potent annonaceous acetogenin identified in paw paw and related species
* **Bullatacin and related acetogenins** — highly bioactive compounds found particularly in seeds, bark, roots, and other non-fruit tissues
Mechanisms:
* Many annonaceous acetogenins inhibit mitochondrial **complex I (NADH:ubiquinone oxidoreductase)**, interfering with cellular ATP production
* Their disruption of mitochondrial energy metabolism can produce cytotoxic effects in rapidly dividing cells under experimental conditions
* Acetogenins can also influence cellular apoptosis and other metabolic pathways, contributing to their observed insecticidal and cytotoxic activity
Overall profile: Paw Paw is an important North American food plant with unusually potent secondary chemistry. The ripe pulp is primarily a **nutritional food**, whereas the seeds, leaves, bark, and roots contain bioactive acetogenins that make medicinal experimentation potentially hazardous. Laboratory anticancer activity has generated substantial interest, but this has not translated into an established human cancer therapy.
**Common dosage:**
* **Fresh ripe fruit:** Culinary consumption; no established medicinal dose
* **Frozen or puréed fruit pulp:** Culinary quantities according to recipe
* **Leaf or bark preparations:** No recommended medicinal dosage because safety and efficacy have not been adequately established
* **Concentrated paw paw extracts:** No established safe therapeutic dosage; should not be self-administered as an anticancer treatment
**Safety factors (including side effects):**
* Ripe fruit is generally considered a food, but some people experience gastrointestinal upset after consuming large quantities
* Paw paw contains compounds that can cause nausea, vomiting, or gastrointestinal irritation in susceptible individuals
* **Seeds, bark, roots, leaves, and unripe fruit should not be consumed medicinally without expert guidance**
* Allergic reactions to paw paw fruit are possible, including reactions in individuals with latex or certain plant-food sensitivities
* Repeated or prolonged exposure to concentrated annonaceous acetogenins is a particular concern because of their mitochondrial toxicity; extracts should not be treated as ordinary nutritional supplements
**First aid / adverse reaction response:**
* **Mild nausea or stomach upset:** Stop consuming the plant material; drink fluids and monitor symptoms
* **Persistent vomiting or diarrhea:** Stop exposure and seek medical advice, particularly if dehydration develops
* **Signs of allergic reaction:** Discontinue use; seek urgent medical attention for facial swelling, difficulty breathing, or widespread hives
* **Suspected ingestion of seeds, bark, roots, or concentrated extract in a significant quantity:** Contact a poison centre or emergency medical service promptly rather than attempting to induce vomiting
**Drug interactions:**
* Theoretical interactions may occur because annonaceous acetogenins affect mitochondrial energy metabolism
* Concentrated extracts could potentially alter the effects or toxicity of medicines metabolized through cellular or hepatic pathways, although specific clinical interactions are poorly characterized
* Individuals receiving chemotherapy should not substitute paw paw preparations for prescribed treatment or combine concentrated extracts with anticancer drugs without oncology supervision
* General interaction consideration: culinary consumption of normal amounts of ripe fruit is fundamentally different from medicinal use of concentrated leaf, bark, seed, or acetogenin extracts
**Horticultural requirements:**
* **USDA / Canadian zone:** USDA Zones 5–9; generally hardy across much of southern and central Canada, although young trees benefit from winter protection
* **Soil pH:** Approximately 5.5–7.0; prefers fertile, slightly acidic to neutral soil
* **Light requirements:** Partial shade when young; full sun to partial shade when mature
* **Moisture:** Consistently moist, well-drained soil; particularly vigorous in moist bottomland soils
* **Other notes (growth habit, harvest timing, etc.):**
* **Growth habit:** Small to medium deciduous tree or large shrub, commonly reaching approximately 10–15 m under favourable conditions
* **Flowering/fruiting:** Flowers appear in spring before or as leaves emerge; large aromatic fruits mature in late summer or early autumn
* **Harvest timing:** Fruit is harvested when it softens and develops its characteristic tropical fragrance, generally August–October depending on latitude
* **Habitat:** Rich deciduous forests, river bottoms, floodplains, ravines, woodland edges, and moist fertile soils
* **Propagation/cultivation notes:** Paw paw is commonly propagated from seed, but seeds require **cold stratification** and should not be allowed to dry out. Named cultivars are generally propagated by grafting. Planting genetically distinct trees together improves pollination and fruit production. Young plants tolerate considerable shade but mature trees fruit best with abundant sunlight.
**Sampling of clinical reports / studies:**
* **Clinical study or report:** Human clinical evidence for paw paw preparations as medicinal treatments is very limited; there is no established clinical indication for paw paw extract
* **Pharmacological study:** Numerous laboratory investigations have demonstrated strong cytotoxic and mitochondrial effects from annonaceous acetogenins such as asimicin and bullatacin
* **Phytochemical study:** Chemical analyses have identified numerous annonaceous acetogenins in paw paw, particularly in seeds, bark, roots, and leaves
* **Ethnobotanical evidence:** Indigenous and regional North American traditions provide substantial evidence for paw paw as a seasonal food and more limited evidence for medicinal use of various plant parts
* **Overall assessment of evidence:** **Strong ethnobotanical and phytochemical interest, but insufficient clinical evidence for medicinal indications.** The ripe fruit is best regarded as a valuable traditional food, while concentrated preparations and non-fruit plant parts warrant significant caution because of their potent mitochondrial effects.
Educational Use Only: The information presented on this page is provided for educational, historical, and informational purposes only. ArdNemeton na Tuatha and Bhùth Draoi do not provide medical advice. Always consult your physician and pharmacist before using any herb, mushroom, supplement, or botanical product for medicinal purposes. Traditional uses described herein do not constitute medical claims.