Hi jw... Didn't want to hijack the potting thread... Large tall red plant is Lobelia Cardinalis... It does just as well or better out of the pond and is perennial (likes water), Split Leaf by skimmer Buddha is a Ligularia, we like the tropical look but it does not like too much sun and needs lots of water... I've now got it in a pot in the pond with just "wet feet" (perennial also)...
Most everything is hardy/perennial; Tasmanian spurge, Hot Lips Salvia, Aster, Delphinim, Creeping Jenny, dianthus, Hebe (it got bit this year with the snow) and what we call Donkeys's Tail groundcover (some kind of very hardy succulent with yellow flowers in the Spring)... Hosta in the creek and WF come back every year bigger than last...
I bring the Taro in for the winter and it does fine in the garage with just occasional waterings... We plant bare-root impatiens in the WF and around the edges for color spots, along with petunias, salvia, and coleus and that's about all the annuals we buy each year... Tried to make a conscious effort to go with perennials just so there's less "knee time" in the spring!!!!
I also go out back of our place and get native sedge every couple years, there is no stopping it and it stays green thru winter and summer in the pond, only the pot keeps it from getting too large...
Take Care... Dave