The dayflowers are part of the Commelinaceae family which also includes the more commonly grown Tradescantia and more scarcely Tinantia. Commelina are annuals and perennials, found across the world, but with many found in tropical areas. Small, three petalled flowers, often blue, top thin stems, with narrow leaves. Similar to Tradescantia, but more delicate. Hardy, but good to protect the roots from excessive cold and damp over winter.