HYB: Questionable seedling

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This is the time I have to make final decisions on some of my seedlings.  I need suggestions about this one.  It has bloomed four years for me, and I have received more compliments on it than on most of my other ones.  I have been told that it is a unique color and pattern.  Its problem is that it a poor grower, subject to many problems in my garden.  After all this time, I have only two healthy rhizomes.  I am tempted to toss them, yet I hate to.  What should I do?

Francelle Edwards  Glendale, AZ  Zone 9