Answer: According to Larry Hodgson and the editors of NGA in "Houseplants for Dummies" the asparagus fern requires bright to medium light, average humidity, normal to cool temps, and an all-purpose fertilizer. He recommends immersing the entire rootball in water for 10 minutes, as the roots become so dense that the soil will have difficulty holding any water.
Yellowing leaves can be a sign of many things, including over- and underwatering, too little light, and lack of nitrogen, which promotes green, healthy foliage. If you have not fertilized, you might want to try that.
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