what did I do wrong?
I planted 4 rhizomes over a month ago. 3 royal ferns and 1 cinnamon fern. 1 of my royal ferns has sprouted and is about 1 foot tall. However I have seen zero growth from the other 3. I try to keep them moist and they get partial to less than partial direct sun. I have them as foundation plantings between my neighbors home and my own. Do they take long to sprout?