A monoculture is when a single crop is grown in a large area. This is very common in modern agriculture, as it allows to harvest large amounts, with relatively little labour. Monocultures have problems, however: It is easier for pests and diseases to spread in a monocultrure than when Crop rotation is used . Growing the same crop also puts a strain on the soil, which may need to be fertilized to support a monoculture. Without special knowledge, monoculture will perform worse than Crop rotation.