Unfortunately many resources regarding this topic are in Chinese or behind paywalls. Especially when trying to find this while already in the country (firewall).
I would like to know which botanical gardens I can visit in Shanghai, right now (April 2016). I am mainly looking for gardens easily accessible by public transport from the city center (say no more than 30 minutes from Nanjing Road).
Any extra information like location, nearby metro stations, entry price, best month to visit or what a garden is known for is much appreciated. Honorable mentions like beautiful freely accessible gardens or gardens just outside of the city are welcome too.