I just got some iris rhizomes and winter is coming. how do I winterize?
I live in Washougal washington
You are just in the nick of time. Plant the rhizomes ASAP and water them in well. Bearded iris (aka German iris) should be planted so that half of the rhizome is above soil level. Start by cutting the leaves back to 4 inches. Dig a hole large enough to lay out the roots in all directions. Place a mound of soil in the middle, put the rhizome on top and splay out the roots. Backfill and tamp down the soil. This year, I would add several inches of wood chips or other loose mulch over the rhizome. This won't be necessary in future years; iris are quite hardy once established.