Pond in full Sun?

xman(7/8)March 25, 2009


I am planning my first pond, it is a 140 gal preformed liner. The current location that I have planned for it is in full sun. I read somewhere that too much sun will cause the water to be green due to algae. is this true?

I am not planning to keep any fish in this pond as the depth of the pond is only 18 inches (and we do have freezes in TX), just a few plants. Can I use chemicals to keep the algae levels down? at the same time I do not want to use anything that is too harsh as my kids may touch the water in the pond.

The other location I have is under trees that drop their leaves in fall and in full shade. Which option should I go with, Sun or Shade? or should I just make it a pondless waterfall?



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horton(6 b Ontario.)

If you have lots of plants in your pond there should not be a problem with green water, after the plants establish themselves. Don't add fertilizer at first, let the plants do their own thing.

You maybe wise to add a few minnows to help keep the mosquito larvae down, or use Mosquito Dunks. You can buy them at a garden store or Home Depot/Lowes.

    Bookmark   March 25, 2009 at 1:02PM
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I have found that floating plants like water hyacinth and water lettuce help a lot with algae and also in keeping the water clear.

I have wondered about mosquito dunks. Are they safe in ponds with fish? Though I haven't seen any mosquito larva, it seems like even with the fish, we have had a lot more mosquitoes in our yard since we've had the pond.

    Bookmark   March 25, 2009 at 10:45PM
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You could add a UV light and that would take care of the green water. My pond is in full sun and don't have a problem as long as the UV is on... turn it off and that is another story. BUT... If you want to keep fish my biggest concern would be that in that small of pond, things would really heat up quickly. Partial shade might be better.

    Bookmark   March 26, 2009 at 4:04AM
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albert_135(Sunset 2 or 3)

As evesta notes a UV light can be quite effective. My spouse has 450 gallon in full sun and one UV light is effective most of the summer, she adds a second when the sun and air temperatures are high.

    Bookmark   March 27, 2009 at 11:08AM
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Is your pond going to be above ground or below ground? Either way, if you have 60% of the surface covered with plants, you shouldn't have any green water. While waiting for plants to fill out, you can shade the pond with an umbrella or shade cloth. Unfortunately, water hyacinth are illegal in Texas or I would recommend them too.

If your pond is below ground, you might be surprised that fish can survive over the winter. I'm in 8a and our first pond was a little peanut shaped pond and that first winter we had a hard freeze with ice so thick over the pond that we could stand on it. And still, the goldfish lived, we could see them through the ice moving around. The lily I had in it was toast though.

The next year I put the same pond on the south side of a building and everything in it did fine.

    Bookmark   March 28, 2009 at 1:16PM
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sleeplessinftwayne(z4-5 IND)

The mosquito dunks are absolutely safe for the fish. The only thing it works on is mosquito larva. It is safe for children. I have even seen a few of my fishies pushing the dunks around when they are bored. Sandy

    Bookmark   March 28, 2009 at 2:09PM
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marti8a why are water hyacinths illegal in Texas? Last summer I bought a house in Conn. with a small water fall/ water garden. I won't have fish. Just plants. I don't want to have more mosquitos than normal so I'll be looking into these dunks you're talking about.

Last summer there were water hyacinths and my water looked fine. It wasn't discolored at all. I threw away all the plants because I was told they wouldn't make it threw the winter. I guess I'll be buying plants every sprint. Does anyone know of plants that could last thru a New England winter? thanks.

    Bookmark   March 28, 2009 at 8:22PM
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buddyrose, like many invasive species, when they get into natural waterways, they can clog them and choke out native species which are food and habitat for native fish and other native creatures. Once their food source and habitat is gone, the critter dies, creating either a break in the food cycle or an opening for a non-native and probably undesirable species to move in.

Every state has their own list of prohibited species. Here is the one for Texas. Last I heard, the fine for being caught with hyacinth was $200. As much as I like hyacinth, it's not worth it to me, both the fine and the damage it would cause in our native lakes and streams.

Here is a link that might be useful: Texas Prohibited Species List

    Bookmark   March 29, 2009 at 2:26PM
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wow. good to know they're that invasive. they're not illegal in CT so I'll buy just a couple for my little water pond. They should fill it by themselves I guess once they spread.

    Bookmark   March 29, 2009 at 9:48PM
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You're probably cold enough that they can't survive a winter. Even here in north Texas where we get a few freezes, they will overwinter in protected coves.

    Bookmark   March 30, 2009 at 11:28AM
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