B, can I hop on your thread? I have just put in a large window box pond at the front - about 40cm deep. Can anyone recommend evergreen, floofy water plants I can put in the box to fall over and cover the edges? At the moment it looks like a window box in a bed. (Cheap option with bricks in for experimentation).
As @thevictorian says, creeping jenny will work well. There is a yellow form. It is evergreen ( or everyellow) and whilst it will spread, it is easy enough to pull up and keep in check. It's always worked well on the edges of my ponds and softens the edges nicely whilst offering an easy entrance/exit.
No different from several other plants in reality Depends what you want, what you want it to do and whether you are prepared to be strict with it. I find it useful in places - one of which is pond edging. As always. each to their own
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Same as greenhouses then?
As always. each to their own