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Will snails survive the winter in my pond? | Decorative Ponds & Water Gardens Q & A

When should I remove the fountain from my pond?

Will snails survive the winter in my pond?
Cody – Falling Spring, VA

While your fish and some of your aquatic plants remain safe and sound during their winter dormancy you may wonder if your snails will be as successful. Your pond snails are amazingly resilient in cold weather and will do just fine given their habitat is suitable.

Your pond depth will play a major role in the success of all of the living creatures in your pond. Your plants, fish and snails can survive in cold water but they won’t fair too well if frozen into a solid block of ice. The ice that forms on the top of your pond varies in thickness depending on where you live but the general rule of thumb is to build your pond to be around 20”-30” in depth. This ensures there is an ample layer of water at the bottom of the pond that is left unexposed to the elements which will provide a safe haven for all of your pets and plants.

You won’t have to worry too much about your snails finding a safe place to hide over the winter as they come equipped with a strong shell which provides adequate shelter. They can hide amongst the rocks and plant remains in the pond as well during the winter but as your fish are in dormancy there is not an overwhelming need for additional habitat. As water temperatures drop and bacteria begin to dwindle a lot of pond owners tend to rely on algaecides to keep their ponds free from algae. If you are using an algaecide in your water garden review the product label thoroughly to ensure it is safe to use with your snails. When your pond comes back to life in the spring your snails will flourish amongst the new plant growth.

Pond Talk: Do you do anything special to provide safety for your snails in the winter?

How does ice form on a pond? | Ponds & Lakes Q&A

How does ice form on a pond?

How does ice form on a pond?
Jonathan – Denver, CO

You look forward to and enjoy the ice formations that appear on your pond each winter but have you ever wondered how it begins? Why is it that the ice in your pond expands when it freezes instead of shrinking and why does ice float?

Unlike those horror flashbacks of falling asleep in science class we’ll keep this as simple and interesting as possible. As the air cools off outside your water looses heat and becomes heavier. This cool and heavy water sinks to the bottom of the pond as the lighter warmer water rises to the top to cool. This process continues until the pond water reaches about 4 degrees Celsius or 39 degrees Fahrenheit and the water cools enough to freeze. Water is unique in the fact that as is it freezes its molecules form crystals that are spaced farther apart causing ice to expand and take up more space. Once the water in your pond begins to form these crystals and expand it actually becomes lighter than warmer unfrozen water and once again begins to rise to the surface of your pond where it begins to form a sheet of ice. If this all seems a bit too wordy or confusing to you visualize a glass of water with ice cubes in it. The spaced out, crystallized, water molecules of the ice cubes make them lighter than the water in the glass and cause them to float at the surface of the water. The water in the glass that is cooled by the ice cube (but not cold enough to freeze) becomes more dense and sinks to the bottom of the glass and the warmest water rises to the top where it is cooled by the floating ice cubes.

The layer of ice formed by this crystallized frozen water can become fairly strong as it becomes thicker. An inch of ice can be strong enough to hold a small animal without cracking. 3 inches of ice typically is enough to bear the weight of the average person and once a pond freezes to 6 to 8 inches thick it is ready to play host to a hockey game or hold up a snowmobile. Some have even taken their cars out on the ice! While we don’t recommend you give it a try, 8 to 12 inches of ice can support a slowly moving vehicle.

Pond Talk: What do you use your pond for in the winter? Do you skate? Ice fish?

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