The present invention provides an improved trellis system for use with low-lying row crops such as berries, tomatoes, peppers, peas, tomatoes, garlic and the like. The trellis systems of the present invention include a pair of end frames provided at opposite ends of a crop row, and one or more intermediate support frames provided along the row, all of the frames being constructed for easy insertion into and removal from the ground. Retaining lines are removably stretched between the end frames, and engaged with receivers on the intermediate frames without having to thread the lines through the receivers. One of each pair of end frames includes a plurality of tightening devices for applying tension to the retaining lines. The trellis systems of the present invention may be easily installed, removed, stored and reused.