Blueberry Hawthorn {Crataegus brachyacantha} Fruiting Shrub | Tea Alt |NON GMO Heirloom | 10+ seeds Free Shipping! Blueberry Hawthorn is one of the "black-fruited" species of hawthorn , but it is only very distantly related to the other black-fruited species such as C. douglasii or C. nigra. The common name "Blueberry haw" refers to the appearance of the fruit, which are almost blue. Growing Info, follow in order: Scarification: Soak in cold water, let stand in water for 24 hours. Stratification: warm stratify for 120 days, cold stratify for 90 days. Germination: sow seed 1/4" deep, tamp the soil, mulch the seed bed. Other: Spring sowing of unstratified seed will produce germination the next spring.