Cut the stems during the early morning when the flower is the most fragrant using a pair sharp pruning shears. Set them gently into a basket or plastic bucket.
Bring the flowers into the house immediately and place them into a vase filled with warm water. This vase is temporary and used to prevent wilting.
Prepare a permanent home for the Bupleurum. Fill a vase with warm water and 1 tablespoon fresh lemon juice.
Remove the Bupleurum from the temporary vase and hold the stems under a warm tap. Trim 1 inch from the stem’s bottoms with sharp scissors. Pull off any foliage that will fall below the vase’s water line to prevent potential bacterial infection.
Arrange the Bupleurum in the permanent vase. Replace the water and preservative every two days.