Deutzia gracilis requires consistent moisture, particularly during its establishment phase in the first year after planting. Once mature, it becomes quite drought tolerant, but regular watering during prolonged dry spells will ensure optimal health and flowering. Ensure the soil is well-drained to prevent waterlogging, which can harm the roots. Container-grown plants will need more frequent watering than those in the ground.

Prune Deutzia gracilis immediately after it finishes flowering in late spring or early summer. This allows the plant to set new wood for the following year's blooms, as it flowers on old wood. Remove any dead, damaged, or weak branches. Thin out about one-third of the oldest stems at the base to encourage vigorous new growth and maintain an attractive, open form.

Deutzia gracilis can be easily propagated from softwood cuttings taken in late spring or early summer, or from hardwood cuttings in late autumn or winter. For softwood cuttings, take 4-6 inch sections, remove lower leaves, dip in rooting hormone, and place in a moist, well-draining potting mix. Keep humid until roots form. Hardwood cuttings are taken from dormant wood.

For Deutzia gracilis grown in containers, repotting is typically needed every 2-3 years or when the plant becomes root-bound. Choose a pot one size larger and use fresh, well-draining potting mix. The best time to repot is in early spring before new growth fully emerges. Plants grown in the ground do not require repotting, but can benefit from soil amendment.