A modular plant cage assembly for supporting a plant during all stages of growth includes a plurality of horizontal members that is each curved along a longitudinal axis such that each of the horizontal members defines an arc of a circular segment. A plurality of vertical supports is each removably coupled between the horizontal members. Thus, each of the vertical and horizontal members forms a cage for positioning around a plant growing in the ground. The vertical supports are stackable in a vertical orientation for adjusting a height of the cage to accommodate all growth stages of the plant. A plurality of stakes is each of the stakes is releasably coupled to one of the horizontal members that is positioned at the bottom of the cage. Each of the stakes penetrates ground such that the cage is spaced above the ground.
