Real Florida grows citrus inland; Leonida does the same. Trailer 2 shows orange groves in aerial frames - one of the cleaner pieces of agricultural detail in the trailer.
For the wider rural region, see the rural towns piece.
What's visible
Rows of trees in regular planting patterns. Fenced fields. Service roads cutting between them. Aerial framing makes them readable as orange groves - the spacing and colour are wrong for any other crop.
Specific size of the citrus belt is unconfirmed. Trailer aerials suggest it's a meaningful inland zone but not overwhelming.
What this region is likely to do
Atmosphere, mostly. Quiet rural drives. Possibly a story-side location for a hideout or meeting. Wildlife encounter territory. Side content density low to medium - this is the kind of region Rockstar uses for mood, not for gameplay loops.