How can such a small plant have such a huge flower output? I guess we'll never know but don't ponder that question too long, just sit back and enjoy a season-long show of bloom that stretches from late April right on through September! Dense, rounded plants with deep green foliage are constantly alive with creamy yellow flowers that are edged in purple and loaded with fragrance. It's the perfect, easy care plant that begs to be planted in groups and admired!