Iris Bulb Planting Depth -- Confused!!
I finally got my Breck's bulbs on the 22nd. I haven't planted them yet since I have about 60 of them and I've had company until yesterday. I noticed the Dutch Iris mix bulbs said plant about 4" deep. I also bought some 32" tall Bearded Iris bulbs that actually have some stems on them (the bags of 3 Lowes has. Iris Barbata, Caprice and Congratulations) and the outer label says to plant them 12 inches deep but then contradicts itself inside the label saying plant the rhizome just below the surface. I thought you were supposed to plant Irises with the top of the rhizome sticking out? I haven't planted any iris in about 10 years probably and could swear my old ones (in Texas) were planted with the tops sticking out. My Iris book says with no less than 4" covering for bulbous irises and just says top level with soil for rhizome irises. The schreiners iris site says with the top of the rhizome sticking out. Is it different in this climate? I'm in Pittsburgh and it says I'm Zone 6, but apparently that isn't always true depending on where you are here.