The spring is beautiful when everything turns green and lively, but those who allergic to fluff can also be annoyed as the cotton-like fuzz is floating around.

The "snow in April" will begin with Chinese parasol catkins seeds floating in the air, followed by willow seeds in late April.

For years, Hangzhou has made efforts to reduce the fuzz in spring.

Willows in Hangzhou are usually planted as landscape trees alongside the West Lake, rivers, and parks. The city's greenery authority has begun to use an "inhibitor drug," which is injected into the willow trees to prevent the production of the flying willow fuzz. Now about 95% of willows growing on the public greenbelts will not produce catkins.

As for the willows in the non-public greenbelts like residential communities, one can contact the greenery authority to solve the problem of fuzz.

The catkins of Chinese parasol trees are divided into two categories. One is the secreta from the insects, the other is the catkins from the fruits. The latter will fly around in the air and become an annual annoyance for many people who suffer from allergies and respiratory diseases.

Hangzhou has groped for years to reduce the fruits. The number of fruits has decreased by around 50% in the two trial sections. The experiment will be applied to more trees after further tests.