What can I plant in this hanging fence box to flower after my bulbs?

[Muststopeating]

I have two of these hanging boxes on a fence that I can see out of huge picture windows.

Last year I planted them with dwarf sweet peas (seeds sown directly) and hung them on the patio side of the fence, which was lovely but late. In autumn I planted a mix of Tete-a-Tete, Muscari & two varieties of Iris and I've hung them on the other side of the fence so that they are visible from our open plan kitchen where we spend all our time.

My preference would be to leave the bulbs in situ and plant 'over' them. But I'm not sure if this is possible? If so, any suggestions as to what I could plant? I prefer pink/white/purples. I generally stay away from hot colours (the daffs being an exception).

The boxes can be hung in full sun or partial shade (west facing) depending on what I plant.

Obviously the other option would be to buy another two boxes and put these in a corner until next spring.

Unless someone tells me that those bulbs won't be happy in a container long term?

Erigeron karvinskianus - flowers for months on end, drought tolerant, never needs deadheading, can be planted over the bulbs (which should be fine left in there)

Your bulbs will be fine in the pots if you plant on top of them, but you might want to replace some of the compost or add feed to the pots to make sure the compost doesn't get depleted.

Nasturtium seeds would be good to plant. They come in all sorts of pretty colours now (not just the hot orange we all know). Some trail too which would look lovely on your fence.

Thanks both, great suggestions. Indeed I do associate nasturtiums with orange but seems I'm wrong.

For either these options would I direct sow seeds after the bulbs start to die back rather than attempt to fit plugs round the bulbs.

I had assumed I couldn't direct sow my dwarf sweet peas because they have quite a strong, deep root (the 7 seeds that germinated in each tub last year filled the base with roots). But perhaps I'm over thinking it?

Is there anything perennial I could plant? If not now then in autumn when I can empty out the bulbs and replant?

I don't mind growing from seed (though don't have a proper greenhouse so am a bit limited space wise) but hate paying for bedding plants that only last a season.

I had wondered about depletion, my plan is to scrape back the top layer each year and replace with fresh as a sort of mulch. But I guess every few years I should probably tip them out and replant in fresh?

Pansy's and polyanthus spring and autumn.
Then summer bedding end of May.

Erigeron is perennial so would just need a tidy up every so often