According to the University of Missouri, compost is a collection of partially decayed organic material created by the warm environment of the compost pile to decompose more quickly than it would in the soil. Compost turns into humus eventually, which is why it is so good for the soil. Compost aids the soil by improving its drainage and making a richer environment for plants to thrive in. All organic material, including flowers and nursery plants, can be composted.
Ensure that flowers and nursery plants are disease-free before you compost them. Plant diseases are often soil borne and difficult to get rid of. Place any diseased flowers or plants into a plastic bag and leave it in the sun until the plants are dry before you add them to your compost pile.
Tear up flowers into small 1-inch-by-1-inch sections. Break apart the nursery plants; Tear off the leaves, rip apart the stems and remove the roots. Be sure no piece is bigger than 3 inches by 3 inches.
Place the torn-up flowers and nursery plants into your compost pile.
Add a 1- to 2-inch-thick layer of manure or soil on top of the flowers and nursery plants.
Stir your compost pile with a stick or turn it over with a shovel or the handle, if it is a rotating compost bin.