String Algae, Blanketweed, Filamentous Algae

More talk about string algae:

A solution to it, if it's a problem for you.
 
To get rid of string algae or blanketweed, add about 1 quart of hydrogen peroxide per 1000 gallons of water.  When the algae grows, clean out as much as you can and just pour the peroxide in.  It gets rid of all of the algae.

Question:  
Is the string algae a bad thing or just some people don't like it. We have it growing on our lilies and it doesn't bother us.

Answer:  
It's an OK thing. It keeps the pond clean and clear. Fish love to eat it, but can't stay ahead of it. I never mind it, but most folks simply can't bear it. I get more letters about blanketweed/string algae than anything else.

More:  
Wow I kinda like it lol. Blanketweed is that the algae on the bottom attached to the liner?

Pondlady again:  
Blanketweed is the stuff that looks like angel hair spaghetti. You can get it out of the pond with a spaghetti fork if you wish.

The conversation continues:  
Thats funny, I think I know what you're talking about it was on the waterfall awhile back, whole thing gets covered in algae and one good rain storm its all gone.

 
Another answer:  
All ponds should have a nice blanket of algae along the sides of the pond that should be about 1/4" to 1/2". At least, that's what mine are like although one pond has no algae along the sides that I can see. I wonder if this has anything to do with the alkalinity of the water.

Pondlady again:  
Algae on the sides of the pond can only help with pH. If a pond is balanced properly, a healthy pH of about 7 happens automatically.

You can learn all about algae, blanketweed or just plain pond scum in my book, "A Practical Guide to Building and Maintaining your Pond", available here.

And visit us at pondlady.com for more conversations like this one and lots more.
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Filamentous Algae aka Blanketweed aka String Algae

We get questions:


Hi, It's me again.

I worked furiously in March to clean out my pond, and you all were a great help. However my enthusiasm, and your great help did not prevent the weather in PA from going cold for the month of April. So I let my pond sit, with the waterfall going 8 hours a day from mid March to now.

I have been calling nurseries around here waiting to get some new plants in there, and then once the plants came in I would put in the fish (I found a guy for that too) however, looking at my pond 2 months after the clean out i see what looked like a green haze, or some fine green cotton candy, I pulled some out and see that it is more like seaweed.

Is this good (that I have food for my future fish), or is this bad (that all the stuff I tried to remove in March is coming back), or something in between?

FYI the nurseries around here are claiming that the water plants should not go in until memorial day.

Thanks in advance



ANSWER

That is filamentous algae. Which species it is is difficult to determine without a microscope. Note that it is most abundant just below the waterfall, where there is a strong current. It likes moving water. Your pond area looks susceptible to influx of nutrient from rain runoff. Nutrient runoff into the pond, especially phosphorus, is the likely source of your algae growth. With your small pond, the best treatment is to first stop the runoff into the pond and then manually remove the algae. I suggest the use of a toilet brush.

Here is a good article on filamentous algae in ponds:

Filamentous algae


More discussion:

After you remove as much of the string algae as you can, you can use Microbe-Lift PL to keep it gone.  H202 works too. Also I have poured a can of beer in a week and that works. Cheap beer.

But the fish do love to eat it.  It's we humans who think it's awful.

Put plants in your pond after the last danger of frost has passed.

You can read more about blanketweed, aka filamentous algae, aka string algae in my new book, A Practical Guide to Building and Maintaining a Pond" Download it here


Join us with your questions at pondlady.com

Spring is leaving

Spring just got to New Orleans and it's leaving already. My garden that was at its peak a few days ago now looks as if goats ate it. I have snaps to pull and compost, petunias that are melting in the heat. My bog garden is growing nicely; it loves the heat. Pictures as soon as some of those baby plants can be seen a bit better. We are so far down on rain this year, that I have to water my bog garden. Something is dreadfully wrong with that picture.

Ponds are turning green all over the South. String algae or blanketweed are taking over ponds that are just now waking up. I have found that having enough anacharis and about half the pond covered will take care of regular green water. String algae or blanketweed need more help. I use Microbe-lift PL and it works just fine. First you must get as much of the stringy stuff out and then use the Microbe-Lift PL according to the directions on the bottle. Using a toilet brush really works well to get existing string algae out of your pond.

Monday, Monday

And the livin' is still hot hot hot. Not anything we are not used to like the rest of the country. How do you folks handle our weather, but without air conditioning? How hot is it? So hot that I didn't write anything here yesterday, so you can stop hitting your refresh button now. We have had oodles of rain in New Orleans. It is normal to have oodles of rain this time of year, but we have had so little since Katrina that we are not used to it. If you stand still very long, there's a good chance mildew will start creeping up your legs.

Oh, ponds, that's right. We talk about ponds here. The cursed blanket weed is rampant this year again because we did not have a freeze again last winter. That's two winters in a row with no freezes. So the filamentous algae flourishes. But under it, if you can get under it, the water is happy and so are the fish. It is the humans who are not happy. We have experimented with many things to control blanketweed. Some of us use a beer and it works! No one really knows why, but it does. One wonders how it got tried the first time. A mishap at a yard party perhaps? The only thing I know works is Microbe-Lift. Great product, great company. Use the Microbe-LIft PL. Not only does it keep the blanketweed at bay, it's good for the fish. Before Microbe-Lift, I had a problem pond (a client's) and was at my wit's end as to how to control the blanketweed. I tried covering the top of the pond with water hyacinths...nope. Finally in desperation, I dyed the water black. I was dreading how it might look, but found that the black water made a rather ugly concrete pond a dramatic reflecting pool. The water lilies shot their flowers up from the black water and elicited ooh's and aah's from everyone. A month later, I drained the pond and NO BLANKETWEED. That was years ago and only recently has that green spaghetti reappeared. I tried it in a liner pond with rocks. It looked awful, so bad, we drained it immediately and refilled it, blanketweed and all. Microbe-Lift was the answer for that pond.