There are two kinds of primroses in Xishuangbanna Botanical Garden, one is self-pollinated, and the other is non-self-pollinated, that is, it must rely on insect pollination  In recent years, the number of pollinating insects has decreased significantly  In addition, a non-self-pollinated primroses produce fewer seeds than self-pollinated primroses  Obviously, non-self-pollinated primroses have worse breeding conditions than self-pollinated primroses
In previous years, the ratio of the number of non-self-pollinated primroses to self-pollinated primroses in the above-mentioned botanical gardens was about 5:1
 However, what visitors see more often in botanical gardens are non-self-pollinated primroses rather than self-pollinated primroses