Grafting or graftage is a horticultural technique whereby tissues of plants are joined so as to continue their growth together. The upper part of the combined plant is called the scion while the lower part is called the rootstock. The success of this joining requires that the vascular tissues grow together. The natural equivalent of this process is inosculation. The technique is most commonly used in asexual propagation of commercially grown plants for the horticultural and agricultural trades. The scion is typically joined to the rootstock at the soil line; however, top work grafting may occur far above this line, leaving an understock consisting of the lower part of the trunk and the root system.

कलम बांधना उद्यानिकी की एक तकनीक है जिसमें एक पौधे के ऊतक दूसरे पौधे पौधे के ऊतकों में प्रविष्ट कराये जाते हैं जिससे दोनों के वाहिका ऊतक आपस में मिल जाते हैं। इस प्रकार इस विधि से अलैंगिक प्रजनन द्वारा पौधे तैयार किये जाते हैं।