山楂是我国的特产,在北京郊区栽培历史悠久,品种(优系)资源较丰富。有栽培面积较广的传统品种——小金星、大金星。还有不少山楂(Cratacqus Pinnatifida,Bqe.)及其变种大山楂(Cratacqus Pinnatifida var.mazor N.E.Br.)的实生类型。全市现有山楂树近60万株(包括少量食用、医药兼用山楂)。主要产地在门头沟、房山、密云、怀柔、延庆等山区县。其中结果树占总株数的四分之三。一般年产量为600万斤左右,历史最高年产将近1,000万斤,最低年产量为300多万斤。近年来,由于各部门的重视,加强了山楂树的管理,使产量和质量均有提高。如密云县东邵渠公社银冶岭大队有山楂树6000余株,因加强了技术管理,年产量一直保持在40—50余万斤,平均株产60—80斤左右,好果率达90％以上。 Hawthorn is a special product of our country, and has a long history of cultivation in the suburbs of Beijing. The varieties (excellent lines) are rich in resources. Have cultivated a wider area of ​​traditional varieties - Venus, Venus. There are many species of hawthorn (Cratacqus Pinnatifida, Bqe.) And its variant Cratacqus Pinnatifida var. Mazor N.E.Br.). The city’s existing hawthorn nearly 600000 strains (including a small amount of food, medicine and hawthorn). The main origin in Mentougou, Fangshan, Miyun, Huairou, Yanqing and other mountain counties. The result tree accounted for three quarters of the total number of trees. The general annual output of about 6000000 jin, history with a maximum annual output of nearly 10 million jin, the minimum annual output of more than 300 kilograms. In recent years, due to the importance attached by various departments, the management of hawthorn has been strengthened so that both output and quality have been raised. For example, there are more than 6,000 hawthorn trees in the commune of Dongsha Canal in Miyun County, Miyun County. Due to the strengthened technical management, the annual output has been maintained at more than 40-50 kilos, with an average yield of 60-80 kilograms and a good fruit rate of 90% %the above.