This grower is fairly sure of this plant identification.
Not sure of the variety but it is a blue / purple colour. The divisions were made in early October 2019 and have yet to be established in the pots.
Purple bearded Iris
Iris ‘Lent A. Williamson’ (Purple bearded Iris). Lavender-violet standards. Very large velvety royal-purple falls, with a brilliant orange beard.
They are fully hardy, but some groups may thrive only in specific growing conditions. All irises are best planted in late summer and early autumn. Outdoors you can grow them in well drained, fertile, neutral or slightly acid or alkaline soil in full sun to lightly dappled shade. In order for irises to thrive, most of them need long, hot summers. Irises that require protection from rain or frost should be grown under glass.
Grown for their distinctive and colourful flowers. Suitable for coastal conditions.
Italics = data drawn from parent genus or speciesView Full Plant Finder Record