Deadheading certain plants or flowers

I can't find a good answer on the web, so I thought I would go to the experts at Dave's Garden. Most of my plants or flowers I know how or when to deadhead. Here is a short list of a few new ones I have planted, and I want to make sure I am deadheading correctly for the ones that will rebloom.

Garden Phlox (David) As far as I know these do not rebloom, where would I snip?
Altroemeria (Princess Lilly Assorted) Do these rebloom and where do I snip?
Liatris (Purple GayFeather) Do these rebloom and where do I snip?
Bee Balm- Same question
Lobelia X Speciosa- Same Question

These are my newest babies, I tend to buy what looks pretty to me, then go on the net to find out what I should do. I couldn't find good answers for these guys. As many times as I have been on here asking for help, glad to say everything is growing beautifully right now thanks to all the advice I've gotton from the gardeners on Dave's Garden. Thanks

For Alstroemeria, deadheading is a little different than normal plants. Instead of just snipping off the flowerhead, you're supposed to pull out the whole stalk that the flower's on (give it a gentle tug, I've found they usually pull out pretty easily). They will rebloom.

I don't think Liatris will rebloom, could be wrong though. I don't grow the others so can't help on those.

Hi Vickiejackson, I have the David phlox and this is what I do: when the flowers start looking ratty, I snip them off just below the flower 'head'. Some of the stems will send out a few more flowers, but not as much as the first batch. Later on, maybe late fall or winter, or when the leaves are turning brown, I cut them almost to the ground and leave them alone. The clump growes back larger the next year. I have also found new seedlings that I did not plant!

All plants need deadheading, unless you want them to set seeds for you to regrow, better to just let a few flowers set seed as seed production weakens the plants as they use a lot of energy doing so, all bulbs will only flower once, so to stop the bulb waisting energy by seeding, you just cut under the actual flower so all the foliage will die down naturally and this feeds the plant so it gets even stronger the following year, all perennials need deadheading, for the same reasons, however, best to just cut off below the flower as the plant thinks it needs to re flower to make seeds for it's survival, therefore it throws up more flowers, they are not always as good and big/strong as the first flush, but never the less, it is extra colour for the rest of the season, shrubs also like deadheading to save energy as do trees, but most trees/shrubs will throw out new shoots before the flowers have all faded ensuring survival, Rhododendrons/Azaleas etc have to be very carefully deadheaded as they form the next seasons flower buds just as the old flowers fade, so you have to just break off the old faded flowers and make sure you don't take any of the tip/stem with the flowers or you remove the tiny new buds as well. I always add a feed around the root system as I do my last deadheading for the end of season to give the plants a boost for the following spring, then again early spring as the new shoots come through so I don't have to worry about soil deficiency and have to trample on the borders to do so when there is a lot of top growth, but I have a fairly sandy soil here in UK, in spring I add my home made compost to the top like a mulch. hope this helps you some. WeeNel.