The strongest smell I notice around my system is actually the fish food. Or the smell on my hands after I touch a tomato plant. Or then there is a strong smell of basil around that plant and then of course mint (if you are going to plant mint some where, plan on giving the mint it's own bed as it will try to spread and take over.) Rosemary is also another nice smelling plant you could put along the front, nice evergreen shrub, ornamental and edible.
Some people have worked ornamental looking ponds into their systems as the fish tank though these are a little more challenging to deal with if you plant to harvest and eat the fish. If you want ornamental fish it might be a nice pretty touch.
There are lots of pretty plants that are quite edible. Lots of Kales and lettuces can look good. There are many edible flowers, day lily, pansy, viola, violet, and nasturtium to name a few right off the top of my head. I think that many herbs are quite lovely, basil, rosemary, stevia, and thyme are a few that have stayed looking nice for me. I think that carrot foliage is nice texture. Many hot peppers can also be quite ornamental as well as edible if you like that sort of thing. I've got a few small pomegranate trees that are really quite nice looking with their flowers. I don't know if they would do well in AP though. Many fruiting shrubs and trees are quite ornamental and I suppose dwarf types could do ok in half barrels like how outbackozzie has done it.
Personally, I think that many veggie plants look really nice but beauty is often in the eye of the beholder and I realize that many of the plants can look rather tattered and unsightly if they are not doing well or as they reach the end of their time. I also know people who really like the look of blue barrels while other people don't.
I love the idea of an AP system right out in the front yard. My AP system has taken over my side yard.
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