noun
Cornus alba; Tatarian dogwood
A species of dogwood with red stems, often used as an ornamental shrub. The Japanese name literally means 'coral dogwood'.
庭にサンゴミズキを植えた。
I planted a Tatarian dogwood in the garden.
冬のサンゴミズキの赤い枝が美しい。
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.
From 珊瑚 (coral) + 水木 (dogwood), referring to the coral-like red stems of this dogwood species.