‘Atropurpureum’ is the classic purple Japanese maple, forming a 4–6 m tree with an airy, rounded canopy and deep red, seven‑lobed foliage that holds colour through summer and flames scarlet in fall. Small red spring flowers give way to samaras. Best colour in full morning sun and afternoon shade, it thrives in acidic, humus‑rich soil and brings four‑season architecture to courtyards and containers.