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Oh...I have the Isola soil *and* Isola water. But mutation...I've never messed with that. I was hoping for a solution to get the citrus ball cactus (and eventually the fourpetal maple) the old-fashioned way by simple breeding.
It would be easier to breed directly for the Fourpetal Maple without trying first for the Citrus Ball Cactus (if you had it, it would help, but it isn't necessary.)
If you had a Citrus Maple, it would also be a an easy one generation cross.
However, from Citrus Maranta & Bluestar Ball Cactus (the other plants you listed won't help in this case, sorry):
Citrus Maranta x Bluestar Ball Cactus = Fragrant Maple
Frgrant Maranta x Bluestar Ball Cactus = Viola Pipe Cactus