That depends. Ferns like cool, shaded soil kept moist and lots of organic matter such as compost or leaf mold mixed into the soil. If you offer them those conditions than growing side by side will be fine - and actually look like a lush fern garden. If the ferns must compete for water they will not do as well. I suggest you plant both and see what happens. You can always dig up one later if you change your mind. Don't be afraid to move plants. Keep growing, Marianne Binetti