Hello - newbie here, and received such good help from my first question about bearded iris rhizomes with holes, that I thought I'd ask about my siberian iris late bloomer. I planted that grouping from plants from a friend who was moving about 7 years ago. Hers always bloomed all at the same time, and since I've had them, it's been the same, until now. Mine finished blooming some time ago, but this past week, I noticed one smaller one on the edge was blooming -the last week of June! Is this unusual? I'm zone 5+.