QUESTION: Are calla lilies sun or shade plants? I’ve seen some conflicting information about this. — Rodney L.
ANSWER: The reason you’re seeing conflicting information is that calla lilies should be grown either in sun or in partial shade, depending on the region where they are grown.
Calla lilies can be grown year-round in USDA Plant Hardiness Zones 8 through 10. However, they can be grown in other zones either as annuals or as part of a houseplant collection. Where calla lilies are grown affects whether they should be planted in sun or partial shade.
The plants thrive in full sun when the temperature is between 60 and 80 degrees Fahrenheit. But if you’re growing calla lilies in a zone where the temperature exceeds 80 degrees Fahrenheit, they will appreciate the respite of partial shade when the temperature climbs.
Remember that full sun equates to six to eight hours per day of direct sunlight. Partial shade means that the plants will get sun for part of the day and shade for part of the day. To be exact, partial shade means that plants get at least two hours of direct sunlight but are in shade for at least half of the day. Calla lilies will benefit most from shade during the hottest parts of the day.
Not sure about how much sun is available in your garden? Draw yourself a simple diagram of the garden and spend a day checking the sunlight at different times of day. Write or draw on your diagram where the sun and shade are at several different times of day. Make sure to indicate on the map what time sun and shade are available. This map will show you where the sun and shade are at what times so you can plant with confidence.