Hello,

Horticulture deals with growing and cultivation of plants that include  medicinal plants, fruits, vegetables, nuts, seeds, herbs, sprouts, mushrooms, non-food crops such as grass and ornamental trees etc..

Wheras agriculture deals with the cultivation of plant as well as animal farming..

It's better to choose what field you would like to work in the future. As both of them have different career prospective.

Hope it answers you.