I planted calla lilies last week, in a morning sun and warm shade in evening. Kept them watered, added Miracle Grow gardening soil to the soil with mulch on top of soil. They were beautiful for about a week, but now the foliage is yellowing and they look wilted. What can I do to save them?
Your Calla Lily should be planted in full sun or part sun location.
The bulbs or rhizomes should be planted about 4 inches deep and watered well after planting. The soil needs to be moist but well draining. Over watering can lead to root rot.
I looks like your plants may be suffering some transplant shock.
Check the soil moisture before watering instead of watering on a schedule.
Do not fertilizer until you see them actively growing.
Here are some links to refresh you on the care requirements.
Remember that if you live in a colder growing zone you will need to lift the plants to store for winter. Calla Lily are hardy in zones 8 and warmer.