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Iris Reticulata
A few years a go Monty mentioned on Gardeners World that Iris Reticulata won't flower a second year because the ground in the UK is too cold.
I decided to experiment by planting some in a pot with a palm. The compost is very gritty and the pot gets baked in the summer.
The spring they have flowered for the second year in succession and they are showing signs of naturalising. A success!
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Well done. It's not just cold but wet they don't like. Given the right conditions in pots or raised beds or planters, many such plants can thrive in the UK.
Mine are always planted in containers to counteract the cold wet soil issue. Same with tulips. I think if you can create the right conditions though - ie a raised bed, as Obelixx says, you could easily do it.
Planted in with other plants which like the same conditions and I'm sure you'd get a nice display and a few years out of them, as you do in pots.
I live in west central Scotland - not where that photo is...