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Are there any concerns using our pond if I fertilize the lawn? | Ponds & Lakes Q&A

Q: Are there any concerns using our pond if I fertilize the lawn?

Q: Are there any concerns using our pond if I fertilize the lawn?

James – Augusta, GA

A: Lawn fertilizers can do beautiful things to your terrestrial landscape. They infuse the soil with nitrogen, phosphorous and potassium. They make the grass green and lush. They’re sometimes mixed with pesticides and selective herbicides, creating a bug and weed-free lawn. When used as directed, fertilizers give you an easy way to feed your meadows.

They do, however, have their down side – particularly if they find their way into your pond or lake.

The phosphorous found in lawn fertilizers can help feed algae growth in your pond. That algae growth, when left unchecked, can create pea-soup colored water, deplete its life-sustaining oxygen and harm your fish. That’s not all. Some lawn fertilizers contain other chemicals that may not be friendly to humans and your aquatic environment.

So how can you limit or prevent fertilizers from entering your pond?

  1. Divert storm water away from your pond: Some runoff will inevitably flow into your pond but, if possible, fashion trenches and canals that steer that storm water into the sewer system or an unused field.
  2. Find a fertilizer with low or no phosphorous: Fertilizer labels include three numbers that refer to their nitrogen (N), phosphorous (P) and potassium (K) levels. In a 5-3-4 fertilizer analysis, for instance, the “3” represents the amount of phosphorous; the higher the number, the more phosphorous in the mix. When shopping for a lawn fertilizer, choose one with the least amount of phosphorous.
  3. When fertilizing, stay at least 25 feet away from the pond’s edge: This will create a fertilizer-free barrier around your pond, thereby preventing the chemicals from leeching into the water.
  4. Use natural products that help cleanse organics from pond water: If algae blooms do happen in your pond, use natural products that contain nutrient-eating beneficial bacteria. The microorganisms found in products like Pond Logic® PondClear™ will break down the suspended debris and muck, while Pond Logic® EcoBoost™ Bacteria Enhancer binds and eliminates phosphates and other toxins.

If the chemicals found in lawn fertilizers concern you, consider using a more natural approach. You can keep your lawn lush and green with grass clippings, aged compost and organic fertilizers. Treat weeds with vinegar/water/soap mixture or corn gluten. Think “green” when feeding your lawn – your pond and its residents will thank you for it!

Pond Talk: How do you fertilize the grass surrounding your pond or lake?

Bind Phosphates & Other Toxins - Pond Logic® EcoBoost™

Should I eradicate all algae from my pond? | Decorative Ponds & Water Gardens Q&A

Should I eradicate all algae from my pond?

Should I eradicate all algae from my pond?
Suzanne – Arlington, VA

In a word, the simple answer to this question is no. Algae serves a vital role in the health of your pond, providing both natural filtration and food for fish and wildlife. Algae also looks aesthetically pleasing in a pond, provided there’s not too much of it.

To better understand algae’s place in your pond, it’s important to know the different types that are common. First, there’s filamentous algae. Often referred to as “pond scum,” growth of filamentous algae typically begins on the pond bottom. As it grows, it rises to the surface, and can quickly spread to cover the entire pond if not controlled.

String algae is the second variety of algae pond owners will invariably come to know. Essentially a variation on filamentous algae, this algae isn’t harmful, but its rapid growth can quickly take over the pond if it’s not controlled. Frequently seen on rocks in waterfalls, string algae has been known to double its mass in 24 hours when conditions are right – leaving little room for beneficial algae growth, and inhibiting the growth of beneficial bacteria and plants.

Where filamentous alga are generally unwelcome in most ponds, planktonic algae is its beneficial counterpart. Planktonic algae generally thrives within the first few feet from the surface, where it relies on light for photosynthesis – and produces food for microscopic pond dwellers and newly-hatched fry. While typically desirable in ponds, planktonic algae can bloom, and some forms can be toxic to animals. In those circumstances, special measures may be necessary to control its growth.

In order to maintain a healthy balance of algae growth in your pond, there are a few simple steps that go a long way. First, consider our Airmax® KoiAir™ and PondAir™ Water Garden Aeration Systems to ensure sufficient aeration. Stagnant water is an open invitation for excessive algae growth. Even if you have a waterfall, consider adding one to increase water circulation. For more aggressive algae treatment, our an algaecide such as AlgaeFix® to kill the algae and then follow up with the Pond Logic® DefensePAC®. And as a precautionary measure, consider adding a selection of Aquatic Plants to help maintain your pond’s equilibrium, to reduce excessive algae-promoting sunlight, and to provide safe havens for fish.

Pond Talk: What type of algae do you battle most?

Pond Logic® DefensePAC®


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