西蓮寺, Buddhist temple in Namegata, Japan

Sairenji is a Tendai Buddhist temple in Namegata, Ibaraki Prefecture, with the mountain name Shira-do-san. Its two national Important Cultural Properties are the 1543 Sanmon gate, originally a two-storey tower gate reduced to one storey in the Kansei era, and the 1287 Sorin-to, a 9.16-metre bronze-sheathed pillar in the shape of a shakujo staff. The 16,000-square-metre grounds also hold a hall rebuilt after an 1883 fire.

The temple was founded in 782 on the orders of Emperor Kanmu and established by Saisen, a disciple of the Buddhist master Saicho. Over centuries it became an important site for religious practice and learning in the region.

Each September 24–30, monks from affiliated temples gather in the Jōgyō-dō for the Jōgyō-zanmai-e, circling the hall for seven days and nights while chanting the Amida Sutra standing. Held since the Kanji era (1087–1094), it is also called "Buddha-raising" and draws pilgrims regardless of sect. Around the same time, 100,000 red spider lilies planted by volunteers bloom in the grounds.

The precinct covers 16,000 square metres, with the two great ginkgo trees standing near the sorin-to and the Niomon gate. The 100,000 red spider lilies planted by volunteers bloom around the Jogyo-zanmai-e, held from 24 to 30 September. The Yamayuri festival runs mid to late July, when 20,000 lilies flower in the nearby satoyama.

The two great ginkgo trees are both male and over 1,000 years old. The first, near the sorin-to, is said to have grown from a staff planted by the temple's founder Saizen, and a Koyasu Kannon is worshipped at its base; the second, with a trunk circumference of about 8 metres, has a Shirodo Inari shrine at its roots. Both bear many large aerial roots called "chichi".