Thats easy!
Just buy entire clove of garlic and carefully take it apart. Sow each bud in the ground, pointy end up. Garlic requires a nice sunny spot (but not hot) and should be grown between Oct-Nov. Later it will require short days, cool (12–18 °C) moist period during its vegetative growth. A well drained soil rich in organic matter with a pH range of 6 – 7 is ideal.
However, if you are growing it commercially, its best you go for plug seedlings from a company as garlic is very prone to diseases and stuff like clove rot etc...