Hello, welcome to the website. My name isXXXXX can assist you with this.
You should be able to take action against the workmen and/or the neighbour for the destruction of your plants if they destroyed them without your consent.
You can do this by issuing a claim online at www.moneyclaim.gov.uk
The value of your claim would be the replacement cost of the plant that was destroyed, taking into account it's age and size etc.
So you want to claim off the people that actually damaged them - yes, you could do this, and if you can show that they did the damage, then yes, I think you have a claim.