First of all, wild melons and vines can't be grafted on big fruit banyan trees. In principle, all plants of Moraceae can be grafted on banyan trees, because they are all plants of the same family, and from the genetic point of view, they can be grafted on each other and survive. As for the grafting method, a general grafting method can be used.

1. Grafting is usually used for the propagation of fruit trees, trees and flowers, as well as the seedling raising of melons and vegetables. Grafting is divided into two categories: branching and budding. The former is suitable for spring and autumn, especially in spring, with high survival rate. Grafting can not only keep the excellent characteristics of scion varieties, but also make use of the beneficial characteristics of rootstock to achieve early fruit and enhance the ability of cold resistance, drought resistance and pest resistance. Breeding materials can also be used economically to increase the number of seedlings.

2. The big banyan tree is a tree of Moraceae, a banyan tree or a small tree. Its height is 4-10m, DBH10-15cm, and its crown is very wide. The bark is grayish brown. Leaves alternate, thick paper, wide oval heart-shaped, long 15-55 cm, heart-shaped at the base. The fruits of banyan are clustered at the base of trunk or on the short branches of old stems, which are large and pear-shaped or flat to gyro-shaped, reddish brown. Stamens 2, anthers ovoid, female flowers, born in another banyan tree.

3. Sweet potato vine, also known as pomegranate, Guolong, sweet potato, etc. , belonging to Moraceae, is the stem and leaf of sweet potato. Perennial deciduous lianas have milk. Air roots and beards attached to trees or rocks. The stem is cylindrical or slightly flat, brown, branched and slightly larger. It can be used as medicine, and has the effects of clearing heat, promoting diuresis, promoting blood circulation and detoxicating. Can be used for treating wind-heat cough, dysentery, edema, jaundice, rheumatalgia, hemorrhoid bleeding, amenorrhea, leucorrhea, dyspepsia in children, traumatic injury and swelling of unknown causes.

4. Sweet potato vine, born on stolons, semi-immersed in the soil. It is the stem and leaf of sweet potato of Moraceae. They all have latex, air roots and whiskers, which are attached to trees or rocks. The stem is cylindrical or slightly flat, brown, with alternate leaves, and the leaves are oval, ovoid or oblong. It has a blunt tip, a wavy jagged edge and a round or heart-shaped base. It's green, with bristles at the top, shallow at the bottom and hairy texture. It is a cryptophyte, with unisexual flowers, oblate peduncle and reddish brown. It was born in sparse forests, hillsides, fields and roadsides in low mountainous areas. Distributed in Hunan, Hubei, Guizhou, Sichuan, Yunnan and other places.

5. Propagation method of sweet potato vine: cutting propagation. Cultivation techniques of sweet potato vines: in Sichuan, stolons are cut into cuttings with a length of 20-40 cm in February and March. After field management planting, weed once a year in spring and summer. After weeding or harvesting in spring, topdressing must be done once.