Question
will they do well in an home (vs professional) Oklahoma greenhouse. Or should I cut them back, put them in trash bags and store in my insulated, but unheated garage. thanks

Answer
Boston Fern ("Nephrolepis exaltata") and Asparagus densiflorus Sprengeri are entirely different shade-loving plants.  But both are hardy to Zone 9 and as you correctly note will need special care to survive your Oklahoma winter.

Asparagus will grow happily in a bright window, especially one that is not shaded by summer trees during the coldest, shortest days of the year.  Keep conditions cool and water only occasionally to slow down metabolism.  Play your cards right and you'll get flowers in the spring -- fragrant ones at that.  It is a close relative of those green spears people grow in the spring and serve with butter.  Not a fern.

Non-flowering Boston Fern is a true fern, and actually a little tougher than Zone 9.  Grow it under the same conditions as the Asparagus, but in the Spring, divide the root ball into individual plants and pot immediately.  Longer days and warmer temps will accelerate growth at that point, and you'll have full grown plants for summer decorating schemes in no time.

You don't want to completely withhold water from these.  Water with discretion, but be cautious about too much of a good thing.  Of course, it goes without saying there should be absolutely zero fertilizer at any point in this Winter exercise.  Good luck,

THE LONG ISLAND GARDENER