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Can Aquatic Weeds Go Dormant? | Ponds & Lakes Q&A

Q:Will my fountain be enough to keep my fish safe this winter?

Q: Can Aquatic Weeds Go Dormant?

Jackie – Kalamazoo, MI

A: Yes, those insidious aquatic weeds can go dormant in the cold season, lying in wait in your lake’s muck and sediment, until spring when the hours of sunlight and temperatures increase. The good news is that you can battle them – even in their overwintering state. Here’s how.

Growth Patterns

When temperatures drop and the sun hovers lower in the sky, you’ll start to see those aquatic weeds retreat and hole up for the winter. The duration of their dormancy will depend on where you live (the weed growth patterns in a California pond, for instance, will differ from those in a Minnesota pond!). But, in general, you can expect to see different pond weeds disappear and reappear at different times of year based on environmental temperatures.

If your pond or lake freezes over, the perennial weeds will typically die back in the winter and re-emerge in the spring. Some plants, however, will continue to grow throughout the cold season, though at a much slower rate than you’d see in the warmer summer months.

Controlling Winter Weeds

Because you’ll probably see little to no greenery growing, it will be a challenge to control winter weeds. Methods that work in the spring and summer – like treating with temperature-sensitive herbicides and algaecides – won’t work in the colder temperatures. So what can you do? Here’s what we recommend:

  • Remove Weeds: If there’s no ice on your pond, you can pull on your hip waders and manually remove the weeds with a Weed Raker. This go-to tool efficiently pulls out aquatic weeds by their roots, slowing their regrowth, and also removes decaying matter.
  • Pond Dye: Pond Dye, available in convenient liquid quarts, will shade the water blue or black and reduce the amount of sunlight reaching the weeds and algae growing at the bottom of your lake. Less sunlight means fewer weeds, regardless of the temperature or time of year.
  • Aerate the Water: If you’re not using your lake as an ice rink, crank on your Airmax® Aeration System. The action created by the aerator will circulate the water and reduce the muck buildup throughout the winter.
  • Feeding Fish: Your fish will enter into a semi-dormant state when the water dips below 50 degrees, so there’s no need to feed them. Doing so will add to the lake’s nutrient load (i.e. weed fertilizer …), which is not what you want to do.

If wintertime weeds are taking over your pond, consider trying some of these time-tested tricks. They’ll minimize the nuisance growth during the cold season and reduce the amount of work you’ll need to do in the spring.

Pond Talk: How do you handle aquatic weeds in the wintertime?

Shade & Protect Your Pond - Pond Logic® Pond Dye

I can’t get chemicals in my state, so how do I get rid of my weeds? | Ponds & Lakes Q&A

Q: I can’t get chemicals in my state, so how do I get rid of my weeds?

Q: I can’t get chemicals in my state, so how do I get rid of my weeds?

Wayne- Ocean Shores, WA

A: Some states – like California, Washington, Maine, Connecticut, New York and New Jersey, among others – regulate the use of chemicals more so than others. If you live in one of these places, and need to control weeds or algae growth around your lake or pond, your choices are limited if you want to avoid fines and protect your local ecosystem.

But don’t worry. You still have options! Here are some ways you can manage pesky weeds and algae while keeping the regulators (and the environment) happy.

  • Mechanical Removal: Use a variety of pond tools to control the growth in your pond or lake. Cut down weeds with a Weed Cutter or Razer™ and rake them out with a weed rake, like the Jenlis Weed Raker™. If you have floating algae, you can also skim it away with a pond skimmer. This mechanical removal will take some work, but they are chemical-free ways to manage weeds and algae.
  • Limit Sunlight: Weeds and algae use sunlight to flourish, so another chemical-free way to tamp down growth is to add pond dye to the water. Available in liquid concentrate and in convenient packet formulas, Pond Dye shades your pond, preventing foliage from thriving.
  • Limit Nutrients: Plants need nutrients to grow, so adding some all natural beneficial bacteria can help. The microorganisms will eat through decomposing organics, fish waste and other plant-feeding fodder. We recommend using ClearPAC® PLUS without Algae Defense®, which contains which contains PondClear™, MuckAway™ and EcoBoost™, along with some pond dye.
  • Aerate 24/7: If you don’t already, keep your Airmax® Pond Series™ Aeration System up and running 24/7. Doing so will circulate the water column and deliver oxygen to the beneficial bacteria as they gobble through the nutrients. Aeration will also promote the growth and reproduction of those beneficial microorganisms.
  • Hire a Professional: If you’ve tried the non-chemical methods and aren’t satisfied with the result, a final option is to hire a licensed applicator in your area that has the proper permits to purchase, transport and apply chemical herbicides and algaecides.

Like them or not, rules and regulations controlling the use of chemicals are in place for a reason. Use common sense and obey the federal, state and local edicts. You have non-chemical options available, so try them out. You have nothing to lose – except a hefty fine!

Pond Talk: What are some other ways to control weeds and algae naturally?

Remove Unwanted Weeds & Muck Build Up  - The Pond Guy(r) Pond and Beach Rake

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