|What type of flowering bush or small tree (total growth 4x4) grows well in shade?|
|Not many shrubs will remain at the size you want and perform well in the shade so your choices are limitied, but consider one of these;
Viking Black Chokeberry (Aronia melanocarpa 'Viking') It is a spreading, multi-stemmed shrub with glossy, dark green foliage turning red to purple in fall. Adapted to wet lowland areas. The white flowers in May are followed by clusters of purple-black fruit. Effective in winter, since the fruit is astringent tasting and avoided by birds till later into the winter. Height 3-5', Spread 3-5'
Green Mound Currant (Ribes alpinum 'Green Mound') A dwarf, mounded shrub with bright green foliage. It is a good choice for use as a facer or a rock garden specimen. Height 2-3', Spread 2-3'
Japanese Kerria (Kerria japonica 'Pleniflora') An upright, arching shrub, with bright yellow, double flowers bloom in early May. Its brilliant yellow-green branches are striking in winter, but will benefit from renewal pruning. Height 3-6', Spread 4-6'
Regent Serviceberry (Amelanchier alnifolia 'Regent') A dense, upright, rounded shrub with excellent foliage and white flowers in spring. The foliage has a nice yellow to red fall color and the sweet, bluish purple fruit is suitable for eating or making jelly. Height 4-6', Spread 4-6'.
Best wishes with your landscape.