The Strawberry Guava (Psidium cattleyanum) is a tropical evergreen shrub or small tree belonging to the Myrtaceae family, which also includes eucalyptus, cloves, and allspice. Native to eastern Brazil, this species is widely cultivated and naturalized across tropical and subtropical regions worldwide for its flavorful, aromatic fruits.
• The common name "strawberry guava" derives from the fruit's distinctive flavor profile, which combines notes of strawberry and guava
• Also known as cattley guava, cherry guava, or purple guava (depending on the cultivar)
• The species name "cattleyanum" honors William Cattley, a 19th-century British horticulturist and patron of botany
• Two main fruit color varieties exist: the red-purple variety (P. cattleyanum var. cattleyanum) and the yellow variety (P. cattleyanum var. littorale, sometimes called lemon guava)
• While prized as a fruit crop in its native range, it has become one of the most aggressive invasive species in tropical island ecosystems, particularly in Hawaii
Psidium cattleyanum is native to the coastal regions of eastern and southeastern Brazil, where it grows naturally in Atlantic Forest (Mata Atlântica) ecosystems.
• Native range extends along the Brazilian coast from Bahia to Santa Catarina states
• Thrives in lowland tropical and subtropical forests, coastal restinga (sandy coastal plain vegetation), and disturbed areas
• Introduced to Hawaii in 1825 as an ornamental and fruit plant, where it subsequently became one of the most destructive invasive species in the islands
• Now naturalized across many tropical and subtropical regions including Hawaii, Florida, the Caribbean, parts of Africa, Indian Ocean islands, Pacific islands, and parts of Southeast Asia
• The genus Psidium comprises approximately 100 species, the majority of which are native to tropical and subtropical America
• The most commercially important relative is the common guava (Psidium guajava), which produces significantly larger fruits
• Native range extends along the Brazilian coast from Bahia to Santa Catarina states
• Thrives in lowland tropical and subtropical forests, coastal restinga (sandy coastal plain vegetation), and disturbed areas
• Introduced to Hawaii in 1825 as an ornamental and fruit plant, where it subsequently became one of the most destructive invasive species in the islands
• Now naturalized across many tropical and subtropical regions including Hawaii, Florida, the Caribbean, parts of Africa, Indian Ocean islands, Pacific islands, and parts of Southeast Asia
• The genus Psidium comprises approximately 100 species, the majority of which are native to tropical and subtropical America
• The most commercially important relative is the common guava (Psidium guajava), which produces significantly larger fruits
The strawberry guava is a densely branched evergreen shrub or small tree, typically reaching 2 to 6 meters in height, though it can occasionally grow up to 13 meters under favorable conditions.
Stem & Bark:
• Bark is smooth, grayish-brown to reddish-brown, and may peel in thin flakes on mature specimens
• Young branches are slightly four-angled (quadrangular) and may be sparsely hairy
Leaves:
• Simple, opposite, elliptic to oblong-elliptic, measuring 4–8 cm long and 2–4 cm wide
• Leathery (coriaceous) texture with a glossy dark green upper surface and a paler, slightly pubescent underside
• Prominent pinnate venation with a distinct midrib; lateral veins are clearly visible on the abaxial surface
• When crushed, leaves emit a characteristic aromatic scent due to essential oil glands embedded in the leaf tissue (a hallmark of the Myrtaceae family)
• Petioles are short, approximately 3–6 mm long
Flowers:
• Solitary or in small clusters of 2–3, borne in leaf axils
• Approximately 2–3 cm in diameter with 4–5 white petals
• Numerous conspicuous white to pale pink stamens (150–200 per flower), giving the bloom a fluffy appearance
• Flowers are hermaphroditic and primarily pollinated by bees and other insects
• Blooming can occur year-round in tropical climates, with peak flowering typically in spring and early summer
Fruit:
• Round to slightly ovoid berry, 2–4 cm in diameter (significantly smaller than common guava)
• Skin color ranges from deep red-purple to bright yellow depending on the variety
• Flesh is juicy, white to pale pinkish, with a soft, granular texture and numerous small, hard, cream-colored seeds embedded throughout
• Flavor is sweet-tart with distinctive strawberry-like and guava-like aromatic notes
• The persistent calyx lobes at the fruit apex are a characteristic feature shared with other Psidium species
Seeds:
• Small, hard, kidney-shaped, approximately 2–3 mm in length
• A single fruit may contain 20–50 seeds
• Seeds remain viable in soil for extended periods, contributing to the species' invasiveness
Stem & Bark:
• Bark is smooth, grayish-brown to reddish-brown, and may peel in thin flakes on mature specimens
• Young branches are slightly four-angled (quadrangular) and may be sparsely hairy
Leaves:
• Simple, opposite, elliptic to oblong-elliptic, measuring 4–8 cm long and 2–4 cm wide
• Leathery (coriaceous) texture with a glossy dark green upper surface and a paler, slightly pubescent underside
• Prominent pinnate venation with a distinct midrib; lateral veins are clearly visible on the abaxial surface
• When crushed, leaves emit a characteristic aromatic scent due to essential oil glands embedded in the leaf tissue (a hallmark of the Myrtaceae family)
• Petioles are short, approximately 3–6 mm long
Flowers:
• Solitary or in small clusters of 2–3, borne in leaf axils
• Approximately 2–3 cm in diameter with 4–5 white petals
• Numerous conspicuous white to pale pink stamens (150–200 per flower), giving the bloom a fluffy appearance
• Flowers are hermaphroditic and primarily pollinated by bees and other insects
• Blooming can occur year-round in tropical climates, with peak flowering typically in spring and early summer
Fruit:
• Round to slightly ovoid berry, 2–4 cm in diameter (significantly smaller than common guava)
• Skin color ranges from deep red-purple to bright yellow depending on the variety
• Flesh is juicy, white to pale pinkish, with a soft, granular texture and numerous small, hard, cream-colored seeds embedded throughout
• Flavor is sweet-tart with distinctive strawberry-like and guava-like aromatic notes
• The persistent calyx lobes at the fruit apex are a characteristic feature shared with other Psidium species
Seeds:
• Small, hard, kidney-shaped, approximately 2–3 mm in length
• A single fruit may contain 20–50 seeds
• Seeds remain viable in soil for extended periods, contributing to the species' invasiveness
In its native Brazilian habitat, P. cattleyanum occupies a range of ecological niches within the Atlantic Forest biome, from coastal restinga to lowland rainforest margins.
Native Habitat:
• Grows in well-drained sandy soils of coastal plains and lowland forests
• Tolerant of poor, acidic soils and moderate drought once established
• Found at elevations from sea level to approximately 600 meters
Invasive Ecology:
• In Hawaii, strawberry guava has invaded over 100,000 acres of native forest, forming dense monotypic stands that displace native vegetation
• Thrives in disturbed areas, forest edges, and gaps in native canopy
• Highly shade-tolerant as a seedling, allowing it to establish under closed forest canopies
• Produces fruit prolifically year-round in tropical climates, with peak fruiting in summer and autumn
• Fruits are consumed and seeds dispersed by feral pigs, birds (particularly non-native bird species), and other mammals
• Feral pigs are a key dispersal agent in Hawaii — they consume the fruits and spread seeds across vast distances through their droppings
• Dense thickets alter soil chemistry, reduce native plant recruitment, and modify habitat structure for native fauna
• Can hybridize with the closely related yellow strawberry guava (P. cattleyanum var. littorale), further complicating management efforts
Reproduction:
• Begins fruiting at 3–5 years of age
• Capable of both sexual reproduction (via seed) and vegetative reproduction (via root suckers)
• Root suckering allows clonal expansion, making mechanical removal difficult
• Seeds germinate readily in moist soil with partial shade; germination rates can exceed 80% under optimal conditions
Native Habitat:
• Grows in well-drained sandy soils of coastal plains and lowland forests
• Tolerant of poor, acidic soils and moderate drought once established
• Found at elevations from sea level to approximately 600 meters
Invasive Ecology:
• In Hawaii, strawberry guava has invaded over 100,000 acres of native forest, forming dense monotypic stands that displace native vegetation
• Thrives in disturbed areas, forest edges, and gaps in native canopy
• Highly shade-tolerant as a seedling, allowing it to establish under closed forest canopies
• Produces fruit prolifically year-round in tropical climates, with peak fruiting in summer and autumn
• Fruits are consumed and seeds dispersed by feral pigs, birds (particularly non-native bird species), and other mammals
• Feral pigs are a key dispersal agent in Hawaii — they consume the fruits and spread seeds across vast distances through their droppings
• Dense thickets alter soil chemistry, reduce native plant recruitment, and modify habitat structure for native fauna
• Can hybridize with the closely related yellow strawberry guava (P. cattleyanum var. littorale), further complicating management efforts
Reproduction:
• Begins fruiting at 3–5 years of age
• Capable of both sexual reproduction (via seed) and vegetative reproduction (via root suckers)
• Root suckering allows clonal expansion, making mechanical removal difficult
• Seeds germinate readily in moist soil with partial shade; germination rates can exceed 80% under optimal conditions
While P. cattleyanum is not considered threatened in its native Brazilian range, it is classified as one of the most problematic invasive species in tropical island ecosystems worldwide.
• Listed among the "World's 100 Worst Invasive Alien Species" by the IUCN Invasive Species Specialist Group
• In Hawaii, it is designated as a noxious weed and is a primary target of biological control programs
• The Brazilian scale insect Tectacoccus ovatus has been introduced in Hawaii as a biological control agent, though results have been mixed
• Mechanical removal and herbicide application are common management strategies but are labor-intensive and often ineffective due to vigorous resprouting from root systems
• In its native Atlantic Forest habitat, the species is not considered at risk, though the broader ecosystem faces severe deforestation pressures (only ~12% of original Atlantic Forest cover remains)
• Listed among the "World's 100 Worst Invasive Alien Species" by the IUCN Invasive Species Specialist Group
• In Hawaii, it is designated as a noxious weed and is a primary target of biological control programs
• The Brazilian scale insect Tectacoccus ovatus has been introduced in Hawaii as a biological control agent, though results have been mixed
• Mechanical removal and herbicide application are common management strategies but are labor-intensive and often ineffective due to vigorous resprouting from root systems
• In its native Atlantic Forest habitat, the species is not considered at risk, though the broader ecosystem faces severe deforestation pressures (only ~12% of original Atlantic Forest cover remains)
Strawberry guava fruits are nutritionally rich and have been valued as a food source in their native range for centuries.
Per 100 g of raw fruit (approximate values):
• Calories: ~43–50 kcal
• Vitamin C: exceptionally high, reported at 20–60 mg (comparable to or exceeding common guava, though values vary by source and cultivar)
• Dietary fiber: moderate, approximately 3–5 g
• Contains potassium, magnesium, and phosphorus in modest amounts
• Rich in antioxidant polyphenols, carotenoids, and flavonoids
• The red-purple variety contains anthocyanins, which contribute to its deep color and antioxidant capacity
• Contains essential oils including α-pinene, limonene, and caryophyllene, which contribute to its distinctive aroma
Note: Nutritional data for P. cattleyanum specifically is limited compared to the common guava (P. guajava); values above are compiled from available literature and may vary by cultivar, growing conditions, and ripeness.
Per 100 g of raw fruit (approximate values):
• Calories: ~43–50 kcal
• Vitamin C: exceptionally high, reported at 20–60 mg (comparable to or exceeding common guava, though values vary by source and cultivar)
• Dietary fiber: moderate, approximately 3–5 g
• Contains potassium, magnesium, and phosphorus in modest amounts
• Rich in antioxidant polyphenols, carotenoids, and flavonoids
• The red-purple variety contains anthocyanins, which contribute to its deep color and antioxidant capacity
• Contains essential oils including α-pinene, limonene, and caryophyllene, which contribute to its distinctive aroma
Note: Nutritional data for P. cattleyanum specifically is limited compared to the common guava (P. guajava); values above are compiled from available literature and may vary by cultivar, growing conditions, and ripeness.
No significant toxicity has been documented for the fruits of P. cattleyanum, which are widely consumed fresh and processed into jams, juices, and desserts.
• Fruits are considered safe for human consumption
• Leaves and bark contain essential oils and tannins common to the Myrtaceae family, but are not known to pose significant toxicity risks at normal dietary or medicinal exposure levels
• As with many Myrtaceae species, concentrated essential oils may cause skin or mucous membrane irritation in sensitive individuals
• No documented cases of poisoning from fruit consumption in the scientific literature
• Fruits are considered safe for human consumption
• Leaves and bark contain essential oils and tannins common to the Myrtaceae family, but are not known to pose significant toxicity risks at normal dietary or medicinal exposure levels
• As with many Myrtaceae species, concentrated essential oils may cause skin or mucous membrane irritation in sensitive individuals
• No documented cases of poisoning from fruit consumption in the scientific literature
Strawberry guava is relatively easy to cultivate in tropical and subtropical climates and is grown both commercially and in home gardens.
Climate:
• Thrives in USDA hardiness zones 9b–11
• Prefers warm, humid subtropical to tropical climates
• Tolerant of brief temperature dips to approximately -3°C (27°F) once established, though young plants are more cold-sensitive
• Optimal growth temperature range: 20–30°C
Light:
• Prefers full sun for maximum fruit production
• Tolerates partial shade but fruiting will be reduced
Soil:
• Adaptable to a wide range of soil types, including sandy, loamy, and clay soils
• Prefers well-drained, slightly acidic to acidic soils (pH 5.0–6.5)
• Tolerant of poor, nutrient-deficient soils
• Does not tolerate waterlogged or poorly drained conditions
Watering:
• Moderate water requirements; drought-tolerant once established
• Regular watering during the first year promotes strong root development
• Reduce watering during fruit ripening to concentrate sugars and improve flavor
Propagation:
• Primarily propagated by seed, which germinates within 2–6 weeks
• Seeds should be sown fresh for best germination rates; dried seeds may have reduced viability
• Can also be propagated by cuttings, air layering, and grafting
• Root suckers can be separated from parent plants for vegetative propagation
Pruning:
• Responds well to pruning and can be maintained as a hedge or small tree
• Prune after fruiting to maintain shape and encourage new growth
• Remove root suckers if clonal spread is not desired
Common Pests & Diseases:
• Fruit flies (particularly Anastrepha spp. and Ceratitis capitata) are significant pests in commercial production
• Feral pigs and birds can cause substantial fruit loss
• Susceptible to guava rust (Puccinia psidii), a fungal disease that affects many Myrtaceae species
• Root rot can occur in poorly drained soils
Climate:
• Thrives in USDA hardiness zones 9b–11
• Prefers warm, humid subtropical to tropical climates
• Tolerant of brief temperature dips to approximately -3°C (27°F) once established, though young plants are more cold-sensitive
• Optimal growth temperature range: 20–30°C
Light:
• Prefers full sun for maximum fruit production
• Tolerates partial shade but fruiting will be reduced
Soil:
• Adaptable to a wide range of soil types, including sandy, loamy, and clay soils
• Prefers well-drained, slightly acidic to acidic soils (pH 5.0–6.5)
• Tolerant of poor, nutrient-deficient soils
• Does not tolerate waterlogged or poorly drained conditions
Watering:
• Moderate water requirements; drought-tolerant once established
• Regular watering during the first year promotes strong root development
• Reduce watering during fruit ripening to concentrate sugars and improve flavor
Propagation:
• Primarily propagated by seed, which germinates within 2–6 weeks
• Seeds should be sown fresh for best germination rates; dried seeds may have reduced viability
• Can also be propagated by cuttings, air layering, and grafting
• Root suckers can be separated from parent plants for vegetative propagation
Pruning:
• Responds well to pruning and can be maintained as a hedge or small tree
• Prune after fruiting to maintain shape and encourage new growth
• Remove root suckers if clonal spread is not desired
Common Pests & Diseases:
• Fruit flies (particularly Anastrepha spp. and Ceratitis capitata) are significant pests in commercial production
• Feral pigs and birds can cause substantial fruit loss
• Susceptible to guava rust (Puccinia psidii), a fungal disease that affects many Myrtaceae species
• Root rot can occur in poorly drained soils
Strawberry guava has a range of culinary, medicinal, and practical uses, particularly in its native Brazil and in regions where it has been traditionally cultivated.
Culinary Uses:
• Fruits are eaten fresh, with a flavor often described as a blend of strawberry, guava, and mild citrus
• Widely used to make jams, jellies, preserves, and fruit pastes
• Popular in juices, smoothies, and sherbets
• Used in sauces, particularly in Hawaiian cuisine where it is incorporated into barbecue sauces and glazes
• The yellow variety is sometimes preferred for processing due to its slightly less intense flavor
Medicinal Uses:
• In Brazilian folk medicine, leaf decoctions have been used traditionally as an astringent and to treat diarrhea and gastrointestinal complaints
• Leaf extracts have demonstrated antimicrobial and antioxidant activity in laboratory studies
• High vitamin C content supports traditional use as a general health tonic
• Research has identified anti-inflammatory and antidiarrheal properties in leaf extracts, though clinical evidence remains limited
Other Uses:
• Wood is hard and dense, suitable for tool handles, fence posts, and small woodworking projects
• Sometimes planted as a hedge or ornamental shrub due to its attractive foliage, flowers, and fruit
• Leaves and fruit can be used as livestock fodder
• In Hawaii, despite its invasive status, some communities harvest the fruit for personal use and small-scale commercial sale
Culinary Uses:
• Fruits are eaten fresh, with a flavor often described as a blend of strawberry, guava, and mild citrus
• Widely used to make jams, jellies, preserves, and fruit pastes
• Popular in juices, smoothies, and sherbets
• Used in sauces, particularly in Hawaiian cuisine where it is incorporated into barbecue sauces and glazes
• The yellow variety is sometimes preferred for processing due to its slightly less intense flavor
Medicinal Uses:
• In Brazilian folk medicine, leaf decoctions have been used traditionally as an astringent and to treat diarrhea and gastrointestinal complaints
• Leaf extracts have demonstrated antimicrobial and antioxidant activity in laboratory studies
• High vitamin C content supports traditional use as a general health tonic
• Research has identified anti-inflammatory and antidiarrheal properties in leaf extracts, though clinical evidence remains limited
Other Uses:
• Wood is hard and dense, suitable for tool handles, fence posts, and small woodworking projects
• Sometimes planted as a hedge or ornamental shrub due to its attractive foliage, flowers, and fruit
• Leaves and fruit can be used as livestock fodder
• In Hawaii, despite its invasive status, some communities harvest the fruit for personal use and small-scale commercial sale
Anecdote
The strawberry guava's invasion of Hawaii is considered one of the most ecologically devastating plant invasions in the islands' history — yet the story of how it got there is a cautionary tale about the unintended consequences of introducing non-native species. • Introduced to Hawaii in 1825 by a single individual (likely as a garden curiosity), it escaped cultivation and spread across multiple islands • Today it infests over 100,000 acres of native Hawaiian forest, earning it the nickname "the worst plant pest in Hawaii" • Feral pigs, themselves an invasive species, have become the strawberry guava's unwitting ally — pigs devour the fruit and disperse seeds across vast distances, while their rooting behavior creates disturbed soil perfect for seedling establishment • This creates a destructive feedback loop known as an "invasive meltdown": pigs spread guava, guava provides food for more pigs, and together they transform native ecosystems • A single strawberry guava tree can produce thousands of fruits per year, each containing dozens of seeds • The species' ability to form dense, shade-tolerant thickets means it can invade even intact native forests, not just disturbed areas • In a twist of irony, some Hawaiian conservationists have explored whether commercial harvesting of strawberry guava fruit could help fund eradication efforts — turning an ecological enemy into an economic resource
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