Pawpaw (Triloba)

The Pawpaw (Triloba) is generally described as a perennial tree or shrub. This is native to the U.S. (United States) has its most active growth period in the spring and summer . The greatest bloom is usually observed in the mid spring, with fruit and seed production starting in the spring and continuing until summer. Leaves are not retained year to year. The Pawpaw (Triloba) has a short life span relative to most other plant species and a slow growth rate. At maturity, the typical Pawpaw (Triloba) will reach up to 25 feet high, with a maximum height at 20 years of 25 feet.

The Pawpaw (Triloba) is easily found in nurseries, garden stores and other plant dealers and distributors. It can be propagated by bare root, container, seed. It has a slow ability to spread through seed production and the seedlings have medium vigor. Note that cold stratification is not required for seed germination and the plant cannot survive exposure to temperatures below -25°F. has low tolerance to drought and restricted water conditions.

Uses of : Landscaping, Medicinal, Culinary, etc.

Ethnobotanic: Some Native American tribes cultivated the pawpaw for fruit and are responsible for its widespread range today. The Cherokee and many other tribes used the pawpaw fruit for food. The fruit, which is the largest edible fruit native to America, is high in amino acids. The Iroquois used the mashed fruit to make small cakes that were dried and stored. The dried cakes were soaked in water and cooked to make a sauce or relish that was served with corn bread. Raw and cooked fruits were dried by the sun or on a fire. These were stored for use in the future or taken on hunts. The Cherokee used the inner bark to make cordage. By twisting the bark, they made string and strong ropes.

Other: The twigs and leaves contain extracts that have insecticidal properties. The leaves contain anti-carcinogens.

Wildlife: Opossum, raccoon, foxes and squirrels eat the fruits. Larvae of the lovely Zebra Swallowtail butterfly (Eurytides marcellus) feed exclusively on the leaves.

General Characteristics

General: Custard-apple or Annona family (Annonaceae). This perennial tree or shrub grows from 3 to 12 m tall. The drooping, pear-shaped leaves are alternate, from 10 to 30 cm long, with smooth margins and pointed tips. The leaves are coated with fine whitish hairs on the upper surface with rusty-colored hairs on the under-side. Leaves are aromatic, with a smell reminiscent of bell pepper. Inconspicuous but interesting flowers (4 to 5cm in diameter) with 3 sepals, are green upon opening and turn to dark purple or maroon in color. From 1 to 4 flowers grow in the leaf axils before leafing, usually in April or May. The six velvety petals (2cm-2.5cm long) are stiff and curl slightly backwards. Yellowish green to brown, cylindrical, mango-shaped fruits are 7-16 cm long and grow solitarily or 2 to 4 together. The large fruits (5 to 16 ounces) ripen between August and October. Fruits have a thin skin, which contain a yellow custard-like pulp that is said to taste like papaya. Some varieties contain a whitish-green pulp that is less flavorful. Fruits contain several flat 2cm long seeds. The deciduous leaves turn bright yellow before dropping in the fall.

Similar species: A. parivflora, is called the “dwarf pawpaw” or “possum-simmon.” A. tetramera, commonly known as ‘opossum pawpaw’, is a rare and endangered species from southern Florida. Other similar species include A. incarna, A. longifolia, A. obovata, A. pygmaea, A. reticulata, A. X nashii.

Required Growing Conditions

This plant grows over much of Eastern North America from Ontario and Michigan south to Florida and Texas. For current distribution, please consult the Plant Profile page for this species on the PLANTS Web site.

Adaptation Pawpaws grow in humid climates and are highly frost tolerant. They grow in the shade in open woods usually in wet, fertile bottomlands, but can grow in upland areas on rich soils. Pawpaws occur as understory trees in oak-hickory forest in the mid-south where they are found in clusters or thickets. They do not do well in coastal environments. The plants purportedly may do well in the Pacific Northwest and parts of California. Growth trials are being conducted at Oregon State University.

Cultivation and Care

The appearance of this tree gives a tropical flavor to temperate gardens and provides edible landscaping. Pawpaws can serve as a screen or can be grown in a container as a specimen tree. Both trees and shrubs have a conical pyramid-like shape when grown in sun, and a more open structure if grown in shade. They can be planted in the shade of tall, open trees or in partial shade, although they fruit best in sun. If planting in open sun, provide a shading structure to allow filtered sun for the first few years. The plants prefer moist, slightly acidic soils and require regular watering, but are adaptable to many conditions. They do not perform well in poorly drained soils and need protection from the wind. At least two plants are needed for cross-pollination.

Seeds: Seeds can be sown in the fall to over-winter or can be stratified by exposing to cold temperature (32-40 degrees) for 90 to 120 days. Seed should never be allowed to dry out. If sowing seeds into containers use deep pots or tubes to allow for healthy roots.

Transplanting seedlings: Transplant seedlings in the spring. Larger plants do not transplant well. The roots are widely spreading, so purchase plants that have been grown in deep pots or tubes to insure healthy plants. The roots are brittle, so use care when transferring from containers. Water the transplants frequently during the growing season.

Vegetative propagation: Pawpaws can be propagated by whip-and–tongue, bark inlay, cleft graft, or chip budding techniques.

General Upkeep and Control

This plant spreads quickly by suckers to form a “pawpaw patch.” Remove suckers as they form if a tree form is desired. Sucker formation slows as the tree develops. Other than control of suckers the plants do not require pruning. The plants are disease and pest resistant and they are not browsed by deer.

Plant Basics
Category
Growth Rate Slow
General Type Tree, Shrub
Growth Period Spring, Summer
Growth Duration Perennial
Lifespan Short
Plant Nativity Native to U.S.
Commercial Availability Routinely Available
Physical Characteristics
Bloom Period Mid Spring
Displays Fall Colors Yes
Shape/Growth Form Single Stem
Drought Tolerance Low
Shade Tolerance Tolerant
Height When Mature 25
Vegetative Spread None
Flower Color Purple
Flower Conspicuousness No
Fruit/Seed Abundance Medium
Fruit/Seed Seasonality Spring Summer
Seed Spread Rate Slow
Gardening Characteristics
Propagations (Ways to Grow) Bare Root, Container, Seed
Moisture Requirements Medium
Cold Stratification Required Yes
Minimum Temperature -25
Soil Depth for Roots 20
Toxic to Nearby Plants No
Toxic to Livestock No
After-Harvest Resprout Ability Yes
Responds to Coppicing Yes
Growth Requirements
pH Range 5.1–7.2 pH
Precipitation Range 9–9 inches/yr
Planting Density 3400–4800 indiv./acre
Soil Textures Coarse, Medium
Soil Depth for Roots 20
Minimum Frost-Free Days 160 day(s)
Salinity Tolerance None
CaCO3 Tolerance Medium
Sustainability & Use
Leaf Retention No
Palatability Low
Fire Resistant No
Causes Livestock Bloating None

Source: USDA, NRCS, PLANTS Database, plants.usda.gov.
National Plant Data Center, Baton Rouge, LA 70874-4490 USA