Berberis julianae is a multi-stemmed, well-branched shrub in the Berberidaceae valued for its spring display, flowering in April to May. Leaves can be either evergreen or deciduous depending on site and clone. It tolerates full sun to partial shade and withstands exposed as well as sheltered positions. It prefers moist but well-drained soils across chalk, clay, loam or sand and is fully hardy in the UK (H7).

Berberis julianae (Wintergreen Barberry) flowers in April–May and suits full sun to partial shade on moist, well-drained soils.

Berberis julianae

Wintergreen Barberry (Berberis julianae) | April Flowers

Berberis thunbergii 'Atropurpurea Nana' is a compact deciduous shrub notable for its purple foliage. It typically reaches about 2.0 m tall with a 2.5 metre spread. Flowering is April to May, producing pale yellow blooms. Plant in full sun on sandy, loamy or clay soils that are well drained or moist but well-drained.

Dwarf Purpleleaf Japanese Barberry is a compact deciduous shrub that flowers April to May with pale yellow blooms and grows to about 2.0 m by 2.5 m.

https://en.wikipedia.org/wiki/Berberis_thunbergii

Berberis, commonly known as barberry, is a large genus of deciduous and evergreen shrubs from 1–5 m tall, found throughout temperate and subtropical regions of the world. Species diversity is greatest in South America and Asia, but native species also appear in Europe, Africa, and North America.