Weigela maximowiczii is a broadleaf deciduous shrub with green foliage. In spring yellow flowers emerge. Grows well with sun - mostly sun and regular water. Does well in average and well-drained soil.
Maximowiczii looks quite similar to middendorffiana, and subsessilis, all three are yellow flowered and very different from the Weigela florida cultivars you generally encounter in gardens. Weigela will cross with Diervilla although I don't know if any of the yellow species has been attempted.