Description
Mammoth is one of the long-standing benchmark feijoa (pineapple guava) varieties from New Zealand, best known for producing some of the largest fruit of any cultivar. First selected in the early 20th century, Mammoth has remained popular for its impressive fruit size, distinctive aroma, and reliable harvests. Its name comes from the unusually large, heavy fruit that set it apart from earlier seedlings. This evergreen shrub is both ornamental and productive, featuring attractive gray-green foliage and brilliant red-and-white flowers each spring. Mammoth performs well in Zone 8 climates and is a favorite among gardeners who prefer feijoas with substantial size and classic feijoa flavor.
Overview
- Exceptionally large fruit — among the biggest of any pineapple guava variety.
- Classic New Zealand selection with a long reputation for quality.
- Self-fertile but produces larger crops with a companion feijoa.
- Evergreen and ornamental — excellent landscape presence.
- Cold-tolerant, making it suitable for the Pacific Northwest and similar climates.
Growing Details
Latin Name: Acca sellowiana
Site and Soil: Well-drained soil; 1/2 day to full day of sun
Hardiness (Temp): 10°F
Bearing Age: 2–3 years after planting
Rootstock:
Size at Maturity: 10–12 ft
Bloom Time: Late spring
Ripening Time: Late October into early November (varies by climate)
Yield: Heavy cropping
Pests and Diseases: Very resilient; few issues in most climates
USDA Zone: 8–10
Additional Notes
- Mammoth produces some of the largest feijoa fruit available — ideal for fresh eating and recipes.
- Annual pruning after harvest helps keep fruiting wood productive and the plant well-shaped.
- Fruit softens slightly after falling; collect frequently for peak quality.
- Explore more Pineapple guava varieties in our collection: Pineapple Guavas
