A method of manufacturing a container-grown seedling protective device includes laying down contiguous lengths of first and second laminar sheets; positioning an array of seedlings therebetween; and sealing the first and second laminar sheets along a congruent edge thereof and along the spaced-apart seams between the seedlings to form individuated pockets, each configured to receive therein a root ball. An alternative method for manufacturing a protective device for container-grown seedlings comprises positioning a plurality of spaced rods of defined length between contiguous lengths of first and second laminar films; adhering the first and second films to form a seam along a congruent edge thereof and along plural spaced apart seams between the rods, the plural spaced-apart seams extending from the congruent edge, thereby to form a contiguous laminate; and removing the rods from between the seams to form individuated substantially sealed plural pockets.
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