Around my mailbox I have "ditch lilies".. 6 "clumps" of 2-4 fans per clump. I would like to remove some and spread them to another area of the yard. In doing so I will make an opening for some new plants. I would add 2 Stella daylilies in the very front as they are much smaller. Will my ditch lilies kill off my Stellas or will they leave them alone and just eventually grown into each other? None of the "clumps" are touching right now, they still have 10" in between each other.