how cold hardy is asparagus fern
Grown Outdoors. Asparagus fern growing outdoors can withstand some light frost, but freezing temperatures, below 32 degrees Fahrenheit, often kill the plant to the ground. After a light frost, the plants do grow back from the roots.rown Indoors. You can grow fern asparagus as a houseplant in any region. Indoors, the plant still needs warm temperatures, but not too warm. A good daytime temperature is about 72 degrees Fahrenheit with a cooler temperature around 60 degrees Fahrenheit at night.