Russian sage is best planted where it will have room to grow to its mature size of three to five feet tall and three to four feet wide without being crowded. It needs full sun and average soil that drains well.
Love Lily of the Valley (Convallaria majalis ), it can spread -- Solution, put it in a pot. Also "makes a wonderful ground cover perennial. The very fragrant flowers appear in abundance in April and May. They are ideal for growing in wild or woodland gardens or use for ground cover in a damp shaded border. They form dense colonies which can last a lifetime."