Across the UK
Iris foetidissima P. An excellent plant for deep shade. Also known as the roast beef plant. Flowers are grey/purple with darker veins. Followed by orange berries which persist into winter. Flowers: June Requires: Part shade. Height: 30-60cm
Often this species needs to be planted just before the frost or needs a long period of cold for Stratification, so its seed dormancy can be overcome.