You don't mention the area space you have for the plant. Hypericum Calycinum will spread and drape over the edges of your planter. Once established a tough plant that should do fine in those conditions.
Thanks for the suggestion. The planter is approx 3.5m long by around 65 wide and mostly shaded although the front will get more sun as it gets higher in the sky later in the year. The Hypericum Calycinum looks good too, added it to the list!
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