Abstract: A protective enclosure for protecting garden plants against frost and other environmental hazards. The enclosure consists of support arches over which a protective cover is deployed. The cover is held in place by elastic hold-downs strung across the outside of the cover at each arch. Each arch presents to the hold-down a concave shape that receives and stabilizes the hold-down. The cover is translucent to sunlight and may include two types of material, one impervious to wind and rain, the other a mesh transparent to wind and rain. The cover or portions of it may be polarized to enhance or retard the pass-through of certain spectra of light. Access to plants is gained by lifting and bunching up the side portions of the cover, which are easily placed in a closed position again when access is no longer necessary.