Calla lilies (Zantedeschia) need moist soil and lots of direct sun. Your dining table location lacks sufficient light, causing yellow leaves despite new growth.
Move to a sunny windowsill. Yellowing should decrease as light increases.
Spring Mulch Management: Lilies, Daylilies, Irises
Valentine's Cut Calla Lilies in a Vase: No Roots = Temporary
Torch Lily (Kniphofia) Root Rot in Wet Florida Summer
Calla Lily Rest Periods and Identification: Zantedeschia aethiopica
Timing Bird of Paradise and Calla Lily Orders for a Wedding
Mango Calla Lily: Features and Growing Guide
Lilies: The Great Garden Plants for Beauty, Fragrance, and Cut Flowers
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