They look kind of like roasted garlic cloves - elephant garlic from your measurements. 😁 I know you’re looking for seed ID but that’s what they look like in picture

Do you have Irises in your pond? If so that's what they look like to me. Maybe I pseudacorus.

There is a yellow Iris in the pond and the flower buds are about the right size. I am surprised I didn't notice the rotting bud all winter, but I suppose not too as I don't spend as much time at the pond when it's cold.

I'll sow them and see what comes up.

Thanks.

It's not buds you are seeing, it's the fruit. If you have I pseudacorus in the pond then I am certain that's what the seeds are. The species is a noxious weed in your area. Yellow flag iris identification and control: Iris pseudacorus - King County

Yes, I meant to say fruit, not bud. Are all yellow iris pseudacorus? This was purchased, though I don't recall from where or exactly when. I realize that doesn't mean it's not a pseudacorus.

Interesting that the link says it's invasive, but there are no restrictions I certainly don't want to spread it. not too far from our house is a wetland that is overrun with yellow iris. While realizing it's invasive it's quite pretty when in bloom.

There are 3 classifications of noxious weeds in WA state depending on how pervasive the plant in question is and its financial impact (usually to agriculture). Iris pseudacorus is listed as a Class C weed or one of lowest concern. And not because it isn't a bothersome invasive - it is - but only that its presence is already so well established here and also because it has minimal financial impact. Control is suggested but left to the property owner.

If you have ever driven from the east side across the 520 Evergreen Point floating bridge at bloom time, there is a huge colony of these irises lining the shoreline of Foster's Island. Hard to miss!!

Pseudacorus is not the only yellow flowered iris but it is easily the most visible and widely distributed one. And the only invasive one.

The seeds look exactly like those of the I pseudacorus which grow in my tiny pond. There are other yellow Iris but I think, given the situation, pseudoacorus is the most likely. The leaves should be visible on the pond margins. Mine are about a foot tall at the moment.

This is a man made pond and the iris is one we bought at a nursery. Is the flower of pseudoacorus distinctive, ie can it be distinguished from other yellow iris?

" Is the flower of pseudoacorus distinctive, ie can it be distinguished from other yellow iris? "

The entire plant is distinctive. First, it is a much taller growing species than any other yellow flowered iris, it is beardless (eliminating many other possibilities) and it will tolerate growing in standing water. Japanese iris will as well but they do not get nearly as tall, have flattened flowers and bloom later than does pseudacorus.

Pseudacorus also spreads quite aggressively when happily sited, which is why it is considered invasive in many areas and all other yellow irises not.

Yesterday mine were a foot tall. Today they are eighteen inches. That's how vigorous it is. I don't have any seeds to show you as I always cut them down in autumn but this is what the plants look like. The roots are orange inside.

If it's the tallest yellow iris, and the only one that can grow in standing water, ours is most likely a Pseudacorus . Damn, that's too bad. It is one of the few water plants that does well in shade. We've had it for 5 years or more and It hasn't escaped it's pot, last year I did divide it so there are two. We have one volunteer outside of the pond.

I will definitely not let it go to seed and may toss it out. I need to find a suitable replacement. This pond is rather shady and finding plants that will grow here and survive the winter hasn't been easy.

If it has no access to moving water - so in your manmade pond that is entirely on your property and not connected to any stream or creek - then it cannot escape and is not really an invasive threat. Deadheading after flowering will eliminate seed development so any increase will be due only to rhizomes. And contained rhizomes that are never exposed to moving waterways should be quite safe.

If it's stayed in a pot for 5 years perhaps it is inhibited by that and the shade. My pond is tiny and I have to throw out half the root clump every year or it would fill the entire space.

I was thinking the same thing about the shade. When we cleaned the pond last year, something we hadn't done for a few years, it had gotten a bit out and was trying to grow into the rocky bottom, but it was easy to remove and that became plant number 2.

We have another pond in a very sunny location and many years ago had planted Saururus cernuus 'Lizards tail'. It took a few years and at first it was kind of nice to have lots of greenery, but it completely took over and it was a hell of a job to clean it out and a few years to eradicate it completely.

This is the day we stated. It took a week of hard labor and then another to let it dry out to kill as much of it as we could before refilling.

This is what it look like now.

Never again. The iris has been much better behaved, so far, but all water plants are on a short leash.

That’s the day you started? Can’t even see the pond!! I note that you’re well prepared for that work - glass in hand! Bet you raised more than a few after that marathon job! 😁 That’s a lovely pond. I especially love the ferns around it.

More of a stunt shot the day before. This was just placing the pump and getting most of the water out. Next day we started in earnest, and yes several were hoisted. :o)

Funny story about the pump. We always rented a pump from Home Depot at a cost of $60 or so for a day. It meant we didn't clean them very often. I talked to my wife and we decided to buy one. We got a what's called a heavy duty trash pump $275. I told my wife we bought a "trash" pump and she responded, :"Why didn't we get a good one?" When I explained, mutual laughter ensued.

Wise move to buy that pump with your two ponds. It must’ve already paid for itself several times over