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Asparagus ferns can be indoor or outdoor plants. It is your choice to plant them in a pot, hang them outside, or plant them directly in the ground. Make sure that you choose an open space that allows room for the plant to grow.  Place it in a space that allows 4 feet of height and 3 feet of width to grow. Think carefully about the location because transitioning the plant from indoors to outdoors can be traumatic for it. If you do choose to change the location, gradually transition the plant during a course of two to three weeks. Start by moving it into a shaded area, like in a patio or under a tree. Then, move it into a place that receives more sunlight until eventually moving it into your chosen spot indoors. This plant needs daytime temperatures around 50 to 75ºF (around 10ºC-24ºC). Night temperatures are best around 50 to 65ºF (10-18ºC). Choose a spot that maintains an average room temperature.  Asparagus ferns can grow in places with moist or dry air, but they do best in a place with moist air. To assure moist air, you can place a humidifier in a room adjacent to the room the fern is placed in. This plant will grow best in a place that has bright, but indirect lighting. It should not be placed fully in the sun. Too much direct sunlight will cause the needles to scorch and drop off of the plant.  You will know that the fern is receiving too little sunlight if it the needles turn yellow. Plant it in a place that benefits from the morning sun. Asparagus ferns do best in soil that is rich, light, and slightly acidic. The soil should also be well-drained. Add peat moss to your soil or buy a peat moss planting mix. Peat moss is the partially decomposed remains of several types of mosses that contribute to the right soil condition for your fern. Your soil is well-drained if water percolates through it easily. You can check this by digging a hole in your soil, filling it with water, and allowing it to drain. Your soil is well-drained if the water drops from 1 to 6 inches an hour.
Choose a location. Search for a location with a moderate temperature. Pick a place with good lighting. Find a slightly acidic soil.