Some plants can be cut back and will rebloom in the spring, others will need to be removed and placed indoors or in a compost pile. Marginal perrenials should be cut back to just below the water level so that no part of the plant emerges from the surface. Summer tropicals should be composted or placed inside to protect them from the freezing temperatures. Make sure you remove as much leaves and debris as you can from both the bottom and the surface of your pond. Stop fertilizing your plants during the winter.
Do some research into all of your plants to see if they are hardy enough to survive the winter in your particular Hardiness Zone. The USDA Plant Hardiness Zone Map was developed by scientists and growers in the US in order to categorize parts of the country by their climate and growing conditions. Gardeners can use this map in order to find out what particular zone their intended growing area is in, and compare this to the plants they hope to grow.
