Olea europaea subsp. africana, commonly known as African wild olive, is a native African tree species found from Eritrea to South Africa in seasonally dry tropical biomes. Successful germination requires overcoming significant physiological dormancy through mechanical scarification (especially endocarp removal) and cold stratification. With proper pre-treatment, germination rates can reach up to 90%, though untreated seeds typically germinate at only 0-5%.
Before sowing
After soaking, place seeds in moist environment at 4°C in refrigerator for 30 to 60 days. Seeds can germinate during cold stratification period. Remove all outer fruit pulp before treatment. Seeds exhibit morphophysiological dormancy requiring both mechanical scarification and cold stratification to overcome dormancy
Sowing
What to expect
Tips
1. Thoroughly remove all outer fruit pulp before treatment, as this significantly affects germination success. 2. Endocarp removal is particularly effective—crack the pit shell by hand vice or rolling a stone over seeds to enhance germination rates to 92%. 3. After stratification, move seeds to a warm location (18-25°C) with adequate humidity. 4. Seedlings should be gradually acclimated over 30 days before transplanting outdoors. 5. Species is extremely drought tolerant once established and prefers full sun and well-drained soil. 6. Keep soil consistently moist but not waterlogged during germination and early growth. 7. This species has a deep, spreading root system—plant away from buildings, patios, and swimming pools. 8. Seeds maintain orthodox storage behavior and viability for several years when stored hermetically at 3°C.
Sources: Kew's Plants of the World Online, World Agroforestry Centre, PlantZAfrica, scientific literature on Olea europaea subsp. africana seed germination, Ecology and Evolution (Vukeya et al., 2023)
