Little princess spirea is an extremely versatile and useful plant. It is a deciduous shrub that can be used as a specimen plant, in hedges, or in mass plantings. It has small, deep green leaves and produces an abundance of delicate pink flowers in the spring. The flowers are followed by small, round, red fruits.
Related plant:
Photinia Little Red Robin
Related plant:
Little Henry Sweetspire
About soil condition, little princess spireas are adaptable to a range of soils as long as the site is well-drained. They are tolerant of both clay and sandy soils, as well as chlorosis. The ideal soil is moist but well-drained, with a pH of 6.0 to 7.5.
Not too different with other Spirea shrubs, the Little Princess Spirea (Spiraea x urticifolia) prefers full sun to partial shade in order to thrive. It's a low-maintenance shrub that's deer-resistant and easy to grow. This plant blooms in late spring with pretty, pink flowers that attract bees and butterflies.
The temperature condition for the little princess spirea is that it should be kept in a cool area. This plant does not like it too hot or too cold. It should be kept in a spot where it gets some sun but not too much.
Ideal humidity condition for this plant is 50%. If the humidity gets too low, the leaves may start to turn brown and crispy. If the humidity gets too high, the leaves may start to turn yellow and drop off.
About fertilizer, this kind of plant likes acidic soils, so use fertilizer that has a low pH. You can also use organic matter to help lower the pH of the soil. As for the roots, they like to be in moist but well-drained soils. If the roots are too wet, they will rot. If the roots are too dry, the plant will not be able to uptake water and nutrients.
Pruning your little princess spirea is important to keep the plant looking its best. You can prune the plant in the spring or fall. If you prune in the spring, you will need to wait until after the plant blooms. If you prune in the fall, you will need to wait until the leaves have fallen off the plant. When pruning, you will want to remove any dead or diseased branches. You will also want to trim back any branches that are growing too long.
Propagation of little princess spirea is typically done through softwood cuttings taken from the tips of new growth in late spring or early summer. Cuttings should be 4-6 inches long and taken from healthy, disease-free plant material. Place the cuttings in a well-drained potting mix and water thoroughly. Keep the cutting moist but not wet and in a location with bright indirect light until new growth appears, which can take 4-8 weeks. Once new growth appears, fertilize with a half-strength balanced fertilizer and continue to water as needed.
Usually, the plant growth rate is about 1 to 2 feet per year. With the right amount of sunlight and water, this plant can grow up to 3 feet per year. It is a fast-growing plant that can reach its full size in just a few short years.
Common problems for this kind of plant plants are powdery mildew, rust, and leaf spot. These can all be treated with fungicides. However, if the plant is already infected, it is best to remove the affected leaves and stems.
Source:
Spiraea japonica 'Little Princess' habit: UIPLANTS
Spirea | East Asian Plants: A Cultural and Horticultural Guide
Spiraea japonica 'Little Princess' habit: UIPLANTS
