Calla color

I have had Zanthedeschia rehmanii for many years.  I got them as a potted
plant with nice strong pink blooms.  In the garden (acid clay, no
supplemental water), they flower well, but the color is very washed out
with only a tinge of pink. Do these callas require any special conditions
for proper color development? 

Donna Maroni, Zone 7

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