- You Will Get 100 Seeds Of Blackberry Bush Rubus Allegheniensis Fruit Seeds. - Description: - Name: Blackberry Bush. - Scientific Name: Rubus Allegheniensis. - Color: White Flowers / Black Berries. - Plant Seeds: Fall / Cold Stratify 3-5 Months. - Plant Height: 36 - 48". - Plant Spacing: 36 - 48". - Bloom Time: Spring Flowers / Summer Fruit. - Hardiness Zone: 3 – 8. - Light Requirements: Sun. - Soil & Water Preferences: Average.