There are no step increases in pay for added responsibility or experience. By my 3rd year working for the parks, I was making the same low wage I always did ($15 an hour) but doing essentially the same job as the full-time florists and responsible for 2 parks, including an important downtown park in OTR. There is no paid time off, no holiday pay, no paid sick leave, or any benefits at all. It is essentially impossible to support yourself on a seasonal wage of $15 an hour, especially considering the major run-up in inflation and housing prices since 2020.
What you do and what you learn is highly dependent on your coworkers and where you happen to be assigned. I learned a lot about horticulture because I was given a lot of mentorship and responsibility, but I had a coworker who barely got to learn anything at all since he was assigned to string trimming and picking up trash most of the time.