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Covering basil plants is a simple yet smart gardening move that protects them from frost, extends your harvest, and keeps those fragrant leaves thriving.
When you cover basil plants, you’re essentially giving them a cozy blanket that shields them from sudden temperature drops and harsh weather.
If you’ve ever watched your basil wilt after a chilly night, you know how important it is to have a plan for covering basil plants when the forecast turns cold.
In this post, we’ll walk you through why you should cover basil plants, the best materials to use, and step-by-step methods for covering basil plants so you can enjoy fresh leaves well into the season.
Let’s dig in and talk about how to cover basil plants the right way.
Why You Should Cover Basil Plants
Basil is a warm-weather lover that simply cannot handle frost.
Even a light frost can turn those lush green leaves into black, mushy messes overnight.
When you cover basil plants, you create a micro-climate that traps heat from the soil and keeps the air around the plant a few degrees warmer.
This extra warmth is often the difference between life and death for your basil when temperatures dip below 50°F.
Covering basil plants also protects them from strong winds, heavy rain, and hail, which can bruise leaves and invite disease.
And if you’re growing basil in a pot, covering basil plants is even more critical because container roots are more exposed to cold than in-ground roots.
Plus, covering basil plants can help you extend your growing season by a week or two on both ends, meaning more pesto, more salads, and more caprese for you.
1. Frost Protection Is the Main Reason
The number one reason gardeners cover basil plants is to protect them from frost.
Basil cells burst when ice crystals form inside the leaves, and that damage is irreversible.
When you cover basil plants before a cold snap, you trap radiant heat from the ground, keeping the plant’s internal temperature above freezing.
A simple cover can buy you several degrees of protection, which is often all your basil needs to survive the night.
2. Extending Your Harvest Window
If you love fresh basil, covering basil plants means you can keep harvesting long after the first frost date.
Many gardeners use covers in early spring to get a head start on planting, and then again in fall to stretch their harvest into late October or even November.
This is especially valuable if you’re growing pesto-making quantities of basil, because you’ll get weeks more of production.
3. Shielding From Wind and Pests
Wind can dry out basil leaves and break tender stems, but covering basil plants acts as a windbreak.
Some covers, like row covers, also create a physical barrier against insects like aphids and flea beetles.
This means you might not need to use pesticides, and your leaves stay clean and unblemished.
Best Materials for Covering Basil Plants
Not all covers are created equal, so knowing what to use for covering basil plants is key.
You want something that lets light in, allows air to circulate, and traps heat without suffocating the plant.
1. Frost Cloth or Row Cover
Frost cloth, also called row cover, is the gold standard for covering basil plants.
It’s a lightweight, breathable fabric that lets in 70–85% of sunlight while adding 2–6 degrees of frost protection.
You can lay it directly over the basil, but it’s better to use hoops or stakes so the fabric doesn’t touch the leaves, since contact can transfer cold.
2. Old Bed Sheets or Pillowcases
In a pinch, you can cover basil plants with an old cotton or flannel sheet.
These materials are breathable and trap heat effectively for a night or two.
Just make sure the sheet is dry, because wet fabric will freeze and make things worse.
It’s a great budget hack when you’re caught off guard by a sudden frost warning.
3. Plastic Sheeting or Tarps
Plastic works for covering basil plants, but you have to be careful.
Plastic traps moisture, and if it touches the leaves, it can cause rot or freeze onto the plant.
If you use plastic, always create a frame with stakes or hoops to keep it off the foliage.
And remove the plastic during the day if temperatures rise above 60°F, because it can quickly overheat and cook your basil.
4. Cloches and Water Walls
For individual plants, a glass jar, plastic milk jug with the bottom cut off, or a store-bought cloche works great.
These act like mini greenhouses for covering basil plants, trapping warmth and humidity around each plant.
Water walls are another option, which are rings of water-filled tubes that absorb heat during the day and release it at night.
How to Cover Basil Plants Step by Step
Now that you know what to use, let’s walk through the actual process of covering basil plants.
Follow these steps and you’ll have protected basil ready to weather any cold night.
Step 1: Water the Basil Before Covering
Moist soil holds heat better than dry soil, so give your basil a good drink in the afternoon before you plan to cover it.
Wet soil releases warmth slowly through the night, which helps keep the air around the plant warmer.
Just don’t water in the evening, because wet leaves combined with cold can speed up frost damage.
Step 2: Build a Simple Hoop Frame
If you’re covering basil plants in a row, insert a few wire hoops over the bed and drape your frost cloth over them.
This keeps the fabric from touching the leaves and creates a pocket of trapped air that insulates the basil.
You can also use bamboo stakes stuck in the ground at an angle to create a tent structure.
Step 3: Secure the Cover Properly
Once your frost cloth or sheet is draped over the hoops, anchor the edges with bricks, rocks, or landscape staples.
This prevents wind from blowing the cover off and ensures no cold air sneaks in from the sides.
Make sure the cover extends all the way to the soil so heat can’t escape from underneath.
Step 4: Remove the Cover in the Morning
As soon as the sun comes up and temperatures rise above freezing, uncover your basil.
Leaving the cover on during a warm day will cause heat to build up, which can wilt or cook your basil.
This step is just as important as the covering basil plants step itself, so don’t forget to peek outside early.
Step 5: Repeat as Needed
Covering basil plants isn’t a one-time deal.
If you’re dealing with a stretch of cold nights, you’ll need to cover and uncover your basil each day.
It sounds like a hassle, but once you get into the rhythm, it takes less than five minutes per day.
Just check your local weather forecast each evening so you know whether to gear up for covering basil plants or leave them be.
So, How to Cover Basil Plants Right?
Covering basil plants is the best way to protect them from frost, wind, and cold snaps, and it’s a skill every basil lover should master.
You can cover basil plants with frost cloth, old sheets, plastic on a frame, or even cloches for individual plants.
The key is to keep the cover off the leaves, trap soil heat, and always uncover during the day.
With these simple methods for covering basil plants, you’ll keep your basil alive and producing long after other gardeners have pulled theirs up.
So next time the forecast calls for a chilly night, you’ll know exactly how to cover basil plants and keep your harvest going strong.
Happy gardening, and here’s to fresh basil on your table for many more weeks to come.