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No, not automatics.
A little known fact is this: If you put your (growing) plants into an environment with less then 12 hours daylight, they will start blooming immediately.
So, if you put them outside in a greenhouse, round March 1, they will be fully blooming round March 21.
They will vigorously continue to do so.
Round the start of May, when the day gets longer, they will slowly start to revert back to the vegetative state.
That is the moment to cut them, hang them and after several weeks you will have extremely potent material to make oil...

So you're doing sun dep! It's a great method to use season for multiple harvests! I've been doing it too, but on a small scale :) The quality of flowers is often noteworthy!