Hi Will,
You are right - a juniper will not make a happy house plant. They require a winter dormancy so to grow one indoors, you will have to mimic its outdoor environment: for 3 - 4 months during the winter, low light, low temps, low water.
That will hold true for any plant that like cool (alpine) conditions. Likewise, if you want to grow a plant that, in nature, has high temperatures and humidity, you will need a greenhouse to mimic their natural environment. The plants we normally consider houseplants are houseplants because our indoor environment mimics theiroutdoor environment.
But you knew all that.
Daisy
