The thorny jujube (Ziziphus spinosa) is used as a rootstock for grafting Ziziphus jujuba varieties. Using a jujube seedling as a rootstock for grafting is more advantageous than using an in vitro (vegetatively) propagated rootstock, as the seedling is more adaptable to site conditions, has a longer lifespan, and exhibits better vitality. It adapts better to water shortages, can utilize supplied nutrients more effectively, the root system develops significantly better than in vitro propagated rootstocks, and the tree requires no support in adulthood, even in windy locations, as it is well anchored in the soil.
Origin: seedlings were grown from directly imported seeds originated in Chinese Shanxi province, Taigu county. The best for produce jujube saplings. Description: deciduous tree or shrub growing 5–8 m tall, usually with thorny branches. The leaves are glossy green, ovate-pointed, 2 – 7 cm long and 1 – 3 cm wide, with three conspicuous veins at the base and a finely toothed margin. The flowers are small, 5 mm wide, with five inconspicuous yellow-green petals. The edible fruit is oval, 1.5–2.0 cm in size, and weighs 10–15 g. The unripe fruits are green. The ripe fruits are purple-brown to brown and have a wrinkled skin, similar to small dates. The flesh has the consistency and flavor of an apple and contains a hard stone with two seeds. For the seed to germinate, the kernel must be cracked; otherwise, the germination rate is low. Use: the seeds of Ziziphus spinosa, called Suan zao ren, are used in traditional Chinese medicine. They nourish the heart, expand blood circulation in the liver, and calm the mind. They are used to treat irritability, insomnia, and heart palpitation.
