This is the 13035th most frequent Spanish word.
plantado
"Plantado" means "planted" or "standing firm."
In this context, 'plantado' is used to mean that someone didn't show up to a planned meeting, leaving the other person waiting.
Juan dejó plantado a su amigo en el parque.
Juan stood up his friend in the park.
Here 'plantados' refers to the act of planting trees, meaning they were placed into the ground to grow.
Los árboles fueron plantados el año pasado.
The trees were planted last year.
In this example, 'plantadas' modifies 'flowers and seeds,' indicating that they have been placed in the soil to grow.