Give it a little sunshine and it blooms gloriously, and once it flowers, the whole balcony is covered in blooms

Spiraea thunbergii (bridal wreath spirea)
Spiraea thunbergii is a very sun-loving plant that likes ample sunlight and tolerates waterlogging; as long as there is no prolonged standing water, it is fine. It is relatively cold-tolerant and has strong adaptability to soil. The Spiraea thunbergii shrub is full and lush, with clean, elegant branches and leaves. In midsummer it can produce elegant white flowers, and the flowering period is very long. It has a killing or inhibiting effect on many harmful bacteria. It is very suitable for planting in courtyards or various types of garden green spaces.
Chionanthus retusus (Chinese fringetree)
Chionanthus retusus likes sunlight, does not tolerate shade, is drought-tolerant and cold-tolerant, dislikes waterlogging, has a long lifespan, and likes to grow in fertile sandy loam with good air permeability. Its tree form is tall and neat, with luxuriant branches and leaves, and a long and beautiful flowering period. When it blooms, the small white flowers are dense and fresh and lovely, and the flowering period lasts about 1 month. It is suitable for planting in courtyards or parks.
Weigela florida
Weigela florida likes sunlight, is cold-tolerant and shade-tolerant, does not tolerate waterlogging, and has low requirements for soil, but moist soil rich in humus is best. Weigela florida has luxuriant branches and leaves, bright and beautiful flower colors, and abundant flowers. Its flowering period coincides with the time when spring flowers are fading and summer flowers are few, and its flowering period lasts as long as 4~5 months. It is suitable for planting in lawns, courtyards in front of or behind houses.