I used to put the plants in the filter box over the flitration media but since the mess of roots - beautiful plants I may add - I decide not to go that route any more. Then I had the water a cleaned filter box cycle into a barrel with a waterfall, full of plants, before re-entering the pond. Worked well.
![Afro O0](https://www.worldwidewatergardeners.org/forum/Smileys/smilies_smf/afro.gif)
I am not doing that now until I rework the pond, koi pond.