Japanese spirea

Japanese spirea generally requires moderate watering, especially during its first year of planting. After that, it does not need much supplemental water. Water them deeply once a week during the growing season (spring to autumn). During the hotter summer months, you may need to water them more frequently. During the winter months, reduce watering significantly or stop watering altogether, as the plant goes into a dormant stage. To maintain the bush’s health, water it thoroughly when the soil is dry to a depth of 1 or 2 inches around the bush.

Japanese spirea, or Spiraea japonica 'Nana', grows best in full sun to part shade and prefers moist, well-drained soils. For optimal health and flowering, the species needs an average of 6 hours of direct sunlight each day. This can be provided from sunrise to just before lunchtime, and again from mid-afternoon until just before sunset. It's best to avoid midday sun, as the plant may be scorched. If using a planted container, make sure it has good drainage and be sure to rotate the container occasionally during the day to ensure all the plant's branches get equal sun exposure.

Japanese spirea (Spiraea japonica 'Nana') should be pruned once a year, in early spring before the new growth emerges. Pruning should be done to remove any dead, damaged or dying branches and to control the size and shape of the plant. The amount of pruning that should be done is minimal, as this plant thrives with minimal attention and intervention. Removing no more than one-third of the total existing branches is recommended to preserve the health of the plant.