Planter liners are a wide variety of plant sleeves designed to fit inside of other planters. The liner may be watertight or porous, depending on its design. Often liners are rectangular containers that fit inside wood or other window boxes. The liner controls the water inside the container; often the liner is intended to be discarded after a few seasons. Some liners are made of natural materials like coconut. These are intended to line wire baskets to prevent soil loss and to provide a natural appearance. These liners degrade over a few years and must be discarded. Few liners are rated to be hung by themselves.
Insert your plant liner inside the planter it is designed to fit. For window-box-style planters the plant liner is often a plastic insert. For metal baskets, the liner will be several inches taller than the top edge of the metal. Often coconut husk or moss is used for metal basket liners.
Add a small layer of gravel in the bottom of the liner. Cut and place a piece of landscape fabric over the gravel. With coconut husk liners it is a good idea to place a plastic watering dish inside the bottom of the husk (otherwise when you water hanging flowers the water will run straight through the pot and your plants will dry out quickly). Place gravel in the plastic dish and cover with landscape fabric; then fill your liner with potting soil, fertilizer and plants.
Place larger plastic pots inside larger terracotta, concrete or ceramic pots. Often these plastic pots are available with built-in watering lines. If the ceramic pot is very large, there may be a big void between the size of the functional liner and the size of the pot. Filling the pot with soil will make it very heavy. One alternative is to fill two or three plastic trash bags with plastic foam peanuts.
Layer the plastic trash bags (filled with plastic foam peanuts) in the base of the large pot. With several bags it is easy to remove them later. Build up until you reach the bottom of your plant liner pot. Place the plant liner so that it is below the edge of the pot. Fill the pot with a small layer of gravel followed by potting soil, fertilizer and your choice of plants. Make sure the watering system of the plant is exposed and add moss around the edges to disguise the system and the edge of the pot.
Examine reusable plant liners every two to three years after the season is over. Remove the plants and soil and clean the liner to look for any problems. Often it is a good idea to remove bacteria and mildew or other types of mineral buildup. Start the next season with clean and fresh liners.
Hang your plant liners using the plant hanger system used by the planter or pot the liner is inside of. Most metal baskets use several chains that connect with a large S hook. Screw an eye bolt into your overhead beam and thread the S hook through the eye. Make sure your eye bolts are rated for the weight of the planter. Rectangular planters will often use two eye bolts. It may be necessary to drill pilot holes if your beam wood is very hard.
Hang your plastic rectangular liners inside of the window-box-shaped planters by placing and filling the liner. The planter is then mounted or hung using brackets, shelves or chains. The chains can be adjusted for height by using small s-hooks to remove links.