1, poppy
Poppy seems to be both familiar and unfamiliar to everyone. In fact, poppies are beautiful, but as the saying goes, "The more charming, the more dangerous." But under the beautiful appearance of poppy, it is highly toxic. If someone uses poppy as medicine, the harm to human body is incalculable, so poppy has long been listed as a crop prohibited by the state.
2. Ephedra plants
Compared with poppy, ephedra may not have heard of it so much. But ephedra is not as toxic as poppy. The fruit of ephedra is as big as a cherry and tastes very sweet. It is precisely because of this feature that many children can't help but want to pick it. But the problem is that ephedra is very toxic.
3.goldenrod
Solidago was first introduced to China from Canada. As an ornamental plant, Solidago was loved by many people when it was first introduced. But after a long time, many people found a very serious problem: too destructive.
4. Aquatic flowers
Aquatic flowers have many aliases. Some people call it "water hyacinth", while others call it "revolutionary grass". In fact, aquatic flowers are as destructive as goldenrod, and both crops have very strong growth ability. However, because aquatic flowers are not only land crops but also can be planted in water, the impact on fisheries is still great.
5. Fast growing eucalyptus
Fast-growing eucalyptus is also an exotic cash crop. In fact, if cultivated well, it can still bring some benefits to people's lives. However, many farmers have found that this fast-growing eucalyptus will cause some damage to the soil after planting for a period of time, and basically no other plants will grow on the land where eucalyptus has been planted.