Sea lavender is also known as marsh-rosemary or statice. It can be found along the sea coasts and in salt marshes. This is a beautiful perennial with small delicate purple flowers. It flowers through October and then the entire plant turns brown. It is highly valued in floral decorations. Due to coastal development, many of the natural habitats have been destroyed, butt is grown extensively for commercial purposes.
Allow plants to die down naturally so they can store needed nutrients in their root systems. Sea lavender will turn completely brown at the end of the season.
Cut back the plant down to a height of 2 to 3 inches from the ground after the first hard frost. Deposit healthy plant material in your compost bin or heap. Throw away any diseased plant material.
Mulch the plants that have been cut back to protect from freezing and thawing. Apply 4 to 8 inches of mulch to the plant bed.