Don't make us tell you to do your own Google search, Yom Kipper. Isn't about
time for you to atone for asking such vague questions?
Exactly what species are you calling "Peacock Fern"? Common names aren't
helpful at all.
If you are hell bent on moving your Japanese Iris, just do it, dude.
There are about 10,000 species of ferns and many having common names that
vary with numerous differences. 'Peacock' is not known generally but all
ferns are foliage plants and always need shady moist positions. Ferns are
neuter plants and serve well as foils for flowering plants.
If you need to move your Irises [Irides?] then do so with as little
disturbance as possible and all should be well.
There is a plant known as Peacock fern. It is neither a fern nor a
peacock. Also known as Selaginella uncinata, it is a spike moss.
Not sure if this is the plant you have. As has been pointed out,
common names lead to much confusion. Google the Latin name to find
a picture. I've grown this plant as a ground cover (damp, shady,
sandy) and as a potted plant.
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