The convenience of it all Because of its tall stems and wide spread, knautia, whose name is pronounced "not-ee-ah," is not an ideal plant for the meticulous gardener. This plant has the potential to invade other parts of your garden. However, it has a flowering season that is relatively long, lasting from early summer to fall, and it produces fascinating and lovely pink to deep-red blossoms that resemble a pincushion. It also has green foliage at...