Wednesday, September 29, 2010
If you're going to try the reblooming irises, they require just a little more attention because they are said to grow more vigorously. They benefit from a little low-nitrogen fertilizer in spring and fall and they should be watered more often during the summer to prevent dormancy. And, of course, since water tends to make iris rhizomes rot, it is recommended to keep the rebloomers separate from other iris and to take extra efforts to make sure the soil drains easily. They also need to be divided more often than usual for best results. And good luck. Schreiner's Iris Gardens lists 65 iris varieties that consistently rebloom in Oregon, including three iris that I grow with my regular iris and which I've never seen rebloom, and then they follow the list up with the admonition to "remember that remonancy is NOT guaranteed."