This perennial from the European nature (to deep in Asia, even in North-Africa) grows well in sunny to slightly shaded places in normal fertile, nutritious (often limy) wet soil to in shallow (even running) water and marshes. The plant forms fleshy, bold, creeping and rooting stems which may be slightly reddish. From those appear glossy, deep green, short-stalked, blundly round-tipped, up to 4 cm tall, often toothed leaves. Out of the upper leaf-axils long-stalked trusses of mostly heavenly blue (sometimes pink) flowers appear, followed by ball-shaped seed-boxes. Ideal in the edge of (even small) ponds. Good winter-hardy.