why do water lettuce turn yellow in my pond

Water lettuce may turn brown if it gets too much sun, too little sun, too much of a certain nutrient, or too little of a certain nutrient. Also, they can yellow if attacked by aphids or water lettuce weevils. Do they show any damage or just turn yellow? How much sun do they get. They don't like a lot of sun. As far as nutrients go, ponds are often low in potassium which you can add.

My water lettuce turns yellow if their leaves are wet when the sun is shining on them.

My water lettue's roots fall off.At first it was the fish but after I seperated it ,it still fall off.why dose this happen

I'm not sure. In the past, water lettuce has grown like mad on my pond but this year, it all died off. Only a few tiny pieces remain. Now, my water hyacinth is browning, much too early for it to be due to cold weather (it's 90 degrees F today!). I don't know why. Normally this time of year, my pond surface has no openings in it with the water hyacinth and water lettuce completing covering the surface. The other plants are behaving normally. I've been meaning to add some FloraFin which has potassium. A deficiency of potassium is a common cause of floating plants not doing well.

The roots will fall off of floating plants when they're dying for whatever reason, be it nutrient deficiency, temperature, lighting, fish biting, etc.

Water lettuce likes partial sun, not too much and not too little.

I've seen the opposite this year. My hyacinth suffered so badly I finally tossed it all, but my lettuce has flourished. My pond would be completely covered if I wasn't tossing overgrowth on a daily basis.

Seems I have to keep an opening in the lettuce, like a stream/channel opening between waterfall and skimmer otherwise my pond gets mucky and stuff coagulates together on the surface. Keeping an open path between waterfall and skimmer the water tends to stay clearer. Has anyone else experienced that?

My water lettuce died off months ago. My water hyacinth is all brown and shriveling right now. It only covers 1/5 as much surface area as in a normal year. I don't know why it's not loving the heat we had this year.

Certainly plants can block normal water flow as well as gas exchange. For the first time in the history of my 9-year-old pond, the surface is mostly open this time of year. In the past, it was salvinia, water lettuce, and/or water hyacinth covering almost every available space.

My hyacinth is TOTAL opposite. These past few weeks the weathers been totally whacky ( and colder ) and I'm starting to get blooms all over the place. The plants have gotten taller and branching out. My 50 gal. (pond) skippy filter is now totally covered. I put 2 plants in and it took a month to have a population explosion. All is green and still healthy.

In a confined area, water hyacinth are more apt to bloom (as they know they can't grow out) and grow upwards. Since I don't confine mine, they never bloom. The last time I got a bloom was maybe 3 years ago when I put some in a hoop of floating garden hose to confine it.

I had no idea hyacinth bloomed. That's neat. Next year, providing I can get it to grow, I'm going to confine some.

I'm wondering, is hyacinth sensitive to salt? Maybe that's why I couldn't get hyacinth to grow this year. I salted my pond for the first time.

I doubt I'll ever do that again; besides losing a patch of horsetail that had quadrupled in size since I bought it, other plants like my once huge parrots feather all but died and still suffer today (darn it), which again I think is because of the salt.

Yep, plants hate salt. When I add salt, only in the spring, I probably put in less than half what they say for planted ponds so the fish get a little benefit but the plants are fine.

Less than half is probably a good rule of thumb. I used half of what's recommended, that was too much.