Temperature: climatic factors such as temperature can help or hinder your plant. Calla lilies do well when you expose them to moderate temperatures. But extremely high temperatures can harm the rhizome of your flower.Winter: you will need to keep your calla lilies indoors during winter. Extreme cold can destroy the rhizome of your flower and you won’t see them come back the next year.
Factors That May Affect Your Calla Lilies Being Annual or Perennial
Potted flower: Keeping your calla lilies potted is a good solution. This way you get and grow your potted calla lilies as perennial either indoors or outdoors.Moist soil: To enhance perennial growth, always maintain an evenly moist soil so the top of your flower does not dry out completely.
Sunlight: Your calla lilies will need an all-day moderate sun supply or a little afternoon shade. This will help your calla lilies yield healthy leaves with good growth.
Garden Calla lilies: You can put your calla lilies outside your garden during spring and summertime. Then during the first frost fall or winter, you take your plant back inside.
You may decide you want your calla lilies to be annual. Therefore, you can simply treat them as annual.Also, there are a few calla lilies varieties that may not survive in harsh conditions. Assuming you are concerned about the climate condition in your zone. Then you can treat your calla lilies as annual and simply replace them every year.