Cornus alba; Tatarian dogwood
A species of dogwood with red stems, often used as an ornamental shrub. The Japanese name literally means 'coral dogwood'.
I planted a Tatarian dogwood in the garden.
The red branches of the Tatarian dogwood are beautiful in winter.
ミズキ is the general term for dogwood trees (Cornus genus), while サンゴミズキ specifically refers to Cornus alba.
Katakana spelling is common for this plant name; usually written in kana.
Kanji spelling is rare and mainly encountered in botanical contexts.
From 珊瑚 (coral) + 水木 (dogwood), referring to the coral-like red stems of this dogwood species.