The majority of my summer vegetables are now in the process of winding down, the cooling temperatures serving as a cue that their mission has been all but accomplished.

Should frost threaten, however, before the last of my tomatoes have ripened to red, I shall drape a sheet of sheer fabric over their supporting cages to afford them some warmth.

The white fabric sheets, marketed as “row covers,” admit of two applications: floating—that is to say, draped over plants—or hooped, which entails affixing them to hoops driven into the ground.

The latter approach affords superior protection for delicate stems and foliage, inasmuch as the hoops preclude the fabric—however lightweight—from compressing the plant's constituent parts.

Row covers will likewise prove eminently efficacious in safeguarding cool-season vegetables—spinach, radishes, cucumbers, potatoes, kale and lettuces among them—as colder weather sets in.

The UV-protectant sheets cannot, of course, perform miracles.

Yet they are capable of elevating the ambient temperature surrounding plants by as much as 8 degrees Fahrenheit—a margin that may spell the difference between survival and demise.

Row covers are procurable in a spectrum of dimensions and, should exigency dictate, may be effortlessly tailored to accommodate one's specifications.

Moreover, they are procurable in three discrete weight gradations.

Lightweight iterations afford but a modicum of protection, thereby rendering them predominantly serviceable as insect barriers during the vernal season.

They likewise permit approximately 90% of sunlight to permeate through to the plants.

Heavy fabrics afford the greatest warmth, yet they intercept sunlight and water to a considerable degree.

Their employment additionally carries the risk of elevating the temperature excessively.

Medium-weight fabrics strike a judicious equilibrium, permitting 70% to 85% of sunlight to reach the plants while raising the surrounding air temperature by 4–6 degrees F.

Inconsequential as this may seem, it can nonetheless afford several additional weeks of growing time.

And brassicas shielded from the elements (cabbages, broccoli and kale among them), together with leafy greens and root vegetables that endure the entirety of winter beneath cover, will burst forth with vigour come spring, well before their spring-sown counterparts have grown accustomed to the season.

Drape floating covers loosely over low-growing plants, securing them by burying their edges in the soil or by arranging stones or bricks along the perimeter, while ensuring that sufficient slack is provided to accommodate plant growth.

Should you wish to safeguard taller or more delicate crops, either procure prefabricated hoops or fashion them yourself by flexing pliable PVC piping into inverted U configurations and subsequently embedding each extremity into the soil so as to construct a frame, over which the fabric is then draped.

It will nonetheless remain necessary to anchor the sheet's peripheries lest it be borne aloft by the wind.

Row covers may be deployed over a solitary in-ground or potted plant, an entire row of crops, or a raised bed.

Even with safeguards in place, you will nonetheless be obliged to monitor your plants and the prevailing weather conditions.

Periodically ascertain the soil's moisture content so as to ensure that your plants receive a sufficient supply of water.

Flowering plants necessitating pollination must be afforded exposure to insects; consequently, one should remain vigilant for open blossoms and remove covers in synchrony with bloom times.

Irrespective of the weight employed, draw the covers back on warm days lest you “cook” your vegetables prior to harvest.

Jessica Damiano pens weekly horticultural columns for Reporters, and moreover disseminates the Weekly Dirt Newsletter.

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