You don't need the Savage Garden, you have me,LOL.
If your D. intermedia forms a hibernacula it is a temperate form and will nned dormancy. So will D. 'California Sunset' which I presume is your D. Hybrida. The jury is still out on D. filiformis var filiformis Red Form, Washington Co., Fla. It is supposed to be non-dormant, but I suspect it may profit from a winter rest. If yours forms hibernacula, it needs dormancy. For the temperate forms, if they form a hibernacula, they are dormant, if not then let them grow. They will tell you what they need. Try to keep the photoperiod close to natural length, and the initiation of the hibernacula will be a natural process.
All the other forms atr tropicals, or may be treated as tropicals. Note however, that D. binata is a light hungry species, and unless you can give the plant adequate winter light (read LOTS of light) it might be best to encourage it to go dormant, and provide a Sarracenia like dormancy for it. It will go dormant in cold conditions, and return in the spring.
Some forms of D. capillaris experience a summer dormancy, but all grow well throughout the winter for me.
-Savage Tamlin