One of the first signs of leaving dormancy is the development of leaf "claws" at the tips. The plant will come out of dormancy when it is darn good and ready. I don't try to force a plant out of dormancy other than provide it warmth and light using a heat mat and grow lights. A lady on another board kept some of hers in a heated GH under 7/24 lighting in order to keep them blooming for a January wedding. So, if you want to encourage a plumie to leave dormancy, you need to duplicate spring/summer temp and lighting.

Don't fertilize until the plant begins leafing out. Also, be very sparing with water until that happens. I would advise moving the plants outdoors when daytime temps are over 60, bringing them indoors for the evening. You should be able to leave them all night when nighttime temps are about 60 as well.
Mike

Thanks for the advise. I have it under grow light and there are some new red colored "claws" but no new leaves yet. I only water (now) when the potting mix is really dry and I haven't fertilized. If I take them out only when the night time temperature is about sixthy, that means that they will only enjoy the outside for about two months. Is that enough? Any one in Chicago with any advise?

OK Nixon,
Here's the truth. Mine are outdoors even when it is in the high 40's, but that is not the general recommendation. (They are brought inside or covered if it gets into the 30's.) They are my plants, and, if they are damaged, it is my loss. I am reluctant to recommend to someone else that they take a similar chance with their plants. Frankly, I think they will not be harmed by temps in the 50's. The soil will retain some heat, so the roots don't get as cold as the air temp might indicate. Also, if the plants are near a wall that gets a lot of sun, there is radiated heat from the wall at night.

I'm sure others will give you additional thoughts.
Mike