The very common method used in ornamental plants and fruit plants to develop new varieties ,called hybrid varieties is known as grafting.
it involve following steps;
1 a bud that has several buds called the scion,of 1 plant is placed over the cut stem with roots of another plant called the stock.
2 the scion and the stocks are firmly placed together.
3 the stock supplies water and minerals to the scion.in due course new cells develop in the area where they are joined and a new variety of plant develops.ex-rose,mango,guava etc