With proper care and sunlight, a Myers asparagus fern can grow to be about 2 to 3 feet wide, and 2 to 4 feet in length. When planted in the ground, the fern will extend horizontally. Those grown in containers or hanging baskets will hang vertically, creating a beautiful cascading effect. Despite their rapid growth, Myers asparagus ferns can tolerate being slightly pot-bound. You should plan on repotting your asparagus fern about once every two years.