Kalk Samen Kuri no Hana (Japanese: 加爾基 精液 栗ノ花),[b] also known as Kalk Samen Chestnut Flower[1] and Chlorine, Semen, Chestnut Flower is the third studio album by Japanese singer-songwriter Ringo Sheena, released on February 23, 2003, on Toshiba EMI / Virgin Music.

The album's lead single was a massive success, topping the Oricon charts for the first time in her career.

[2] The 2001 single "Mayonaka Wa Junketsu" (真夜中は純潔, Midnight is pure) was to have been included on the album along with one of the single's b-sides, "Aisaika no Choushoku" (愛妻家の朝食, The breakfast of the devoted husband), however these tracks were dropped on the basis of not thematically fitting in with the rest of the album.

Toshiyuki Mori orchestrated each of the recorded songs and arranged the entirety of "Yattsuke Shigoto".

Kalk Samen Kuri no Hana was ranked second in CNN International Asia's list of "the 2000s' most under-appreciated Japanese music of the last decade" on December 22, 2009.