I have these plants producing flower in January. However these plants are colourful out of flower......the glaucous foliage of stocks, the vivid green foliage of wallflowers, the azaleas and dwarf rhodos often have olourful buds and leaves, all give colour over the winter. By June, for me, my tender perennials are in. I mentioned hebes and conifers to reinforce this foliage colour......glaucous hebe, orange foliage of rheingold, blue of juniperus blue star, the red uncinia, the bright yellow foliage of Taxus and juniper aurea, etc. colour in winter can come from foliage and flower and this is what I tried to convey. (just got in to check the posts on this forum and my emails)