Iris Pseudacorus Bastardii, With Its Vigorous Broad Green deciduous Foliage & Amazing Large Primrose Yellow Flowers, Makes An Attractive Addition To Any Garden Or Pond Margin. After Foliage Has Died Back In Autumn, Cut Back To Just Above The Water Surface.iris Bastardii Is A Fast Growing Hardy Perennial Reaching 120cm In Height. Plant In A Basket 20cm Below The Water Surface In Full Sun Or Partial Shade. flowers june-julyheight 120cmplanting Depth 0-20cm