Yes, if you want them to keep blooming. Deadheading also keeps them from getting long and scraggly.
Do I need to dead-head the dried blossoms on snapdragon plans?
yes. the plant sets it's energy to making seed if you don't deadhead. If you deadhead, the plant will try to make seed again (by blossoming).
Reply:yes you do , I bought some this year and have done awesome since I took off the old flowers , start at the bottom never off the top and what them bloom . ty dee
Reply:yes ....then I save the heads for the seeds....make sure that they are good and dry first or they wont be mature enough for seeds saving