To give you a visual: here's the pond in spring (top) and in summer (bottom)...
These were taken from almost the same spot. If you look closely, you can see the fallen tree on the far banks as a comparison. Pretty crazy, right? Here in California, that's about as much "change of seasons" that we get, so it's neat to be able to make observations at such a spot.
As you can see, the marsh grasses -- sedge, smartweed, cattails, and rushes -- take over almost all of the pond and leaving just a wet, mucky bit in the center:
In spring, the banks are covered in a beautiful, colorful range of wildflowers. But in summer, yellow star thistle and bull thistle run the show, with some tarweed and bindweed here and there. (There's a reason these varieties are considered invasive!) But the bees love them, even if we don't! ;)
We also found a new-to-us variety of sedge this week:
At least I think it's a sedge -- it looks so very different from the flatleaf variety we're used to. But I remembered "sedges have edges" from Botany in a Day and then did some Googling. ;) (If you know what kind it is, please give me details in the comments!)