The translation of “零落成泥碾作尘只有香如故” into English can indeed convey the beauty of the original Chinese. Here is one possible translation:

“Though scattered to dust and ground into powder, the fragrance remains as it was before.”

This translation aims to preserve the essence of the original phrase, which speaks of the enduring nature of fragrance despite the passage of time and the decay of physical form. The English version maintains the poetic quality and emotional depth of the original Chinese, making it a beautiful rendition.