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"Hierbas" is a form of "herbar", a transitive verb which is often translated as "to dress with herbs". "Planta" is a noun which is often translated as "plant". Learn more about the difference between "hierbas" and "planta" below.
herbar
A transitive verb is a verb that requires a direct object (e.g., I bought a book.).
1. (general)
la planta(
plahn
-
tah
)A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
2. (factory)
a. plant
Mi hermano trabaja en una planta depuradora.My brother works at a water purification plant.
3. (personnel)
b. story (United States)
Regionalism used in the United States
Este edificio tiene 20 plantas.This building is 20 stories high.
c. storey (United Kingdom)
Regionalism used in the United Kingdom
El bloque de apartamentos donde vive Susana tiene solo tres plantas.The apartment block where Susana lives is only three storeys high.
5. (design)