I thought the question was about vertical ladders, not wood ladders. As far as I know there is no rule against vertical ladders.
What does gender have to do with the ability to climb a ladder? I must have missed that day in HI class, I'm sure some of the female home inspectors, linemen, etc. may take exception to that comment. Or is the assumption that all florists are female?
These are OSHA approved Hatch Access Vertical Ladder–Light Duty