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My pond has some filamentous algae growth around the edges. It’s too cold to treat, right? | Ponds & Lakes Q&A

Q: My pond has some filamentous algae growth around the edges. It’s too cold to treat, right?

Q: My pond has some filamentous algae growth around the edges. It’s too cold to treat, right?

Jeff – Hanahan, SC

A: Cold-weather algae. It’s the worst. And, unfortunately, you can’t treat it right now because the temperatures are too low. Your pond or lake’s water temps need to be higher than 60°F before you can start treating the green stuff with algaecide.

So until things heat up, you have two options:

  1. Rake It Out: If you can safely access and maneuver around your pond, grab your Pond & Beach Rake and get to work skimming and pulling that filamentous algae out of the water and up onshore.
  2. Add Some Color: Pond Dye will limit the amount of sunshine that reaches the algae. Without enough sun, the algae can’t survive. So toss a Pond Dye water-soluble packet or some liquid concentrate into your pond – and your problem is solved!

Once your water temperatures rise above 50°F, start adding PondClear™ & MuckAway™ to the pond. The beneficial bacteria will clear the water and start breaking down the debris and nutrients that are feeding that troublesome algae.

Pond Talk: How much time do you spend puttering around your pond or lake in the winter?

Protect Your Pond in All Seasons - Pond Logic(r) Pond Dye Quarts

Is it Too Cold to Treat My Pond for Algae? – Pond & Lake Q & A

Picture of Floating Algae

Pond & Lake Q & A

Q: I see some algae in my pond. Is it too cold to treat my pond at this point? – Jack of Ohio

A: Algae has a tendency to grow in colder temperatures even when there is ice covering your pond. To treat or not to treat really all just comes down to the temperature of the water. Algaecides, like Algae Defense (or Hydrothol if your have koi or goldfish in your pond), are most effective when water temperatures are above 50-60 degrees Fahrenheit. If you are living in the southern climates, the water temperatures may be already high enough for an algae treatment. As for the northern climates, it may be best to hold off until the water temperatures rise above the 50-60 degree Fahrenheit threshold.

Algae Growth During the Winter – Water Garden Q & A

Algae Growing in a Water Garden During Winter.

Q: I shut my water garden down for the winter, but I still see some algae growth. Can algae grow in cooler temperatures?

A: In some cases, a pond that stays clean and clear through the summer can blow up into an algal nightmare in the fall. Shutting down your watergarden ceases the flow-through characteristics of the pond. This reduces the amount of filtration that occurs both mechanically (i.e. skimmers) and biologically (i.e. filterfalls). Since there is less flow, it is a good idea to bump up the amount of bacteria in the pond by adding Seasonal Defense Bacteria with Barley. These bacteria operate in cooler conditions and will greatly reduce the amount of nutrients in the water, and also contains barley straw to naturally help with the algae. Using Oxy-Lift Defense to scrub down your rocks will also help to remove any debris build up.

Algae Growth During the Winter – Pond & Lake Q & A

Picture of Algae in Ice.

Q: That isn’t algae growing under the ice, is it?

A: A common question that we receive in the winter pertains to winter algae and what to do with it. In the northern climates, there are strains of algae that do thrive in temperatures down to freezing. The good news is that typically these strains do not reach nuisance levels in ponds or lakes. They tend to hang out in warmer locations, usually around an inflow of water, where it is nice and sunny. In optimal growing conditions, these algae can generate enough biomass to put your fish at risk. A sudden die-off caused by a sudden swing in temperature, overcast weather, etc. can deplete the dissolved oxygen levels under the ice which leads to unnecessary fish stress.

Solutions: Nutrient management in your watershed as well as your pond will slow down the growth of any algae or plant all season. Typically phosphorus is the key nutrient for algal growth, so try switching to phosphorus free fertilizers if you fertilize your lawn. Our Pond-Clear Packets and Pond-Clear Pellets eat away at the muck/nutrients found in the pond. Our Nutri-Defense Packets bind up any excess nutrients flowing in from the watershed. These are things to do in the summer, but what about winter? With the pond frozen over, your options are limited. Dying the pond a deep blue with pond dye will reduce the amount of sunlight that passes through the water column. If you can safely do it, I would suggest adding an extra dose through the ice to slow down growth.

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