Deutzia gracilis aka Japanese Snowflower

Deutzia gracilis is a small shrub known as slender deutzia. Japanese snow flower is another name for this plant. It belongs to the hydrangea family, Hydrangeaceae. Its native range covers central and southern Japan. It has also spread to parts of China and the United States. The shrub drops its leaves each year and grows slowly. Its dense branches form a broad, rounded mound. Most garden plants reach 2–4 feet [0.6–1.2 metres] tall and wide. Some sources report heights of 5–6 feet [1.5–1.8 metres].

The thin stems spread out and curve toward the ground. Young bark is smooth, while older bark may peel. Leaves grow in pairs on opposite sides of each stem. They range from oval to narrow, with pointed tips. Their edges have uneven teeth, and both sides bear hairs. The green leaves have a light, papery feel. They reach about 0.25 feet [0.08 metres] in length. The species gives little or no fall leaf color.

White flowers crowd the branches in small, upright clusters. Each flower has five petals and a bell or star shape. The blooms have a scent and cover much of the shrub. The main show lasts about one to two weeks. Bloom dates vary from April into early June by location. Flowers form on growth made in past years. Dry, brown capsules follow, but add little garden interest. North Carolina State lists the plant as attracting hummingbirds.

Give this shrub sun or part shade and moist, well-drained soil. It grows in sand, loam, clay, and chalk soils. It also accepts acid, neutral, or alkaline soil. Rich loam suits it well, and sun gives the most flowers. Afternoon shade helps the leaves in hot summer climates. Strong sun and heat can bleach leaves almost white. The plant tolerates drought, though it prefers moist soil. Sources place it in USDA zones 4–8 or 5–8. The RHS gives it a UK hardiness rating of H5. Late spring frosts can still cause harm.

Use it in groups, shrub borders, foundation beds, or loose hedges. It also suits cottage gardens and open woodland settings. Deer seldom damage it, and care needs are low. Prune after bloom to remove dead stems and keep its shape. Renewal pruning helps when growth starts to look untidy. Take softwood cuttings in summer to raise more plants. Aphids, leaf miners, and leaf spot may occur. The RHS also notes a risk of honey fungus. The ASPCA lists it as non-toxic to dogs, cats, and horses.