oh i've heard of this plant . i grow it as well . my neighbor had a big tree and she gave me cuttings and they wonderfully . they flowers bloom all day and are big , i don't know why you think they smell good to me it smells musky a bit . i've enerv heard of them being annuals , your probably thinking abiut brugmansia probably or jimsom weeds that i can find growing as a weed anywhere , there seed pods are spikey and the sap from any part of the plant is poisonous . i've seen amny forms , tree growing , low growing , bush growing , white flowered , oink flowered , yellow flowered , all sorts . my plant datura does not make seeds for some reason . if your talking about the vine morning glory i have that too but it grows like a weed .