Plants collectively, or the study and science of plants in general.
From 'botanic' plus the plural or mass noun suffix '-s.' This is used as both a plural noun and sometimes as a singular mass noun referring to plant life generally.
While 'botany' is the fancy scientific word for plant study, 'botanics' is more casual and can refer to either the plants themselves or the field of study. It's like how 'physics' can be the subject or 'mechanics' can refer to actual mechanical things!
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