Care Of Ornamental Cabbage Plants – Vibrant Fall Colors That Defy
Do you feel a sense of dread when the summer sun fades and your colorful flower beds begin to wither?
It is a common struggle for gardeners who want their outdoor spaces to remain lively during the chilly months.
The good news is that you don’t have to settle for a brown, dormant landscape once the frost arrives.
By focusing on the care of ornamental cabbage plants, you can enjoy stunning hues of purple, rose, and cream all winter long.
In this guide, I will walk you through everything you need to know to keep these hardy beauties thriving.
From selecting the best soil to managing winter pests, you’ll find all the practical advice needed for a spectacular cold-weather garden.
Understanding the Unique Appeal of Ornamental Cabbage
Ornamental cabbage, known scientifically as Brassica oleracea, is not your average grocery store vegetable.
While they are technically edible, these plants have been specifically bred for their striking visual appearance rather than flavor.
The first thing you should know is that these plants are actually “cool-season annuals.”
They don’t just tolerate the cold; they actually require it to look their absolute best as the season progresses.
Unlike most flowers that fade when the thermometer drops, these plants intensify in color.
When temperatures dip below 50°F (10°C), the plant begins to produce brilliant pigments that make the leaves pop.
The Difference Between Cabbage and Kale
You might hear the terms “ornamental cabbage” and “ornamental kale” used interchangeably at your local nursery.
While they are very closely related, there is a simple visual trick to tell them apart for your garden planning.
Cabbages typically have broad, flat leaves that form a tight, rose-like head in the center.
Kale varieties usually feature deeply ruffled, fringed, or feathery leaves that create a more textured, airy look.
Both require the exact same maintenance routines, so feel free to mix and match them.
Combining the smooth leaves of a cabbage with the curly edges of kale creates a wonderful contrast in planters.
Selecting the Perfect Location for Your Garden
Before you dig your first hole, you need to consider the environment.
These plants are remarkably hardy, but they do have a few non-negotiable requirements for long-term health.
Sunlight is the most critical factor for maintaining those deep, rich colors you see in professional landscapes.
Aim for a spot that receives at least six hours of direct sunlight every single day.
If you plant them in too much shade, the stems will become “leggy” as they stretch toward the light.
This results in a weak plant that is more susceptible to flopping over during a heavy snow or rainstorm.
Soil Quality and Preparation
Your soil serves as the foundation for everything that follows in your gardening journey.
Ornamental cabbages prefer a soil that is rich in organic matter but, more importantly, drains very quickly.
If your garden has heavy clay soil, the roots may sit in water and begin to rot during the rainy autumn months.
I always recommend mixing in some compost or aged manure to improve the structure and nutrient profile.
The ideal pH level for these plants is slightly acidic to neutral, roughly between 5.8 and 6.5.
If you aren’t sure about your soil’s pH, a simple home test kit can provide the answers you need.
Mastering the Care of Ornamental Cabbage Plants: Water, Soil, and Light
Once your plants are in the ground, the real work begins, though I promise it is quite simple.
The care of ornamental cabbage plants revolves mostly around consistency rather than complex techniques.
Watering is the area where most beginners make mistakes, either by over-saturating or letting the soil go bone dry.
The goal is to keep the soil consistently moist, similar to a wrung-out sponge, but never soggy.
During the cooler fall months, evaporation slows down, so you won’t need to water as often as you did in July.
Check the top inch of soil with your finger; if it feels dry to the touch, it is time to give them a drink.
The Importance of Drainage
If you are growing these in containers, ensure there are plenty of drainage holes at the bottom.
I like to add a layer of small stones or potting grit to the base of the pot to help water move through.
In garden beds, you can “mound” the soil slightly so that excess water runs away from the main stem.
This simple trick can prevent many of the fungal issues that plague winter gardens in damp climates.
Avoid watering the foliage directly, especially late in the evening when the sun cannot dry the leaves.
Moisture trapped between the tight leaves can lead to mildew or localized rot that ruins the plant’s appearance.
Feeding and Fertilizing for Maximum Growth
Many gardeners wonder if they should keep fertilizing their plants as the weather turns cold.
The answer depends largely on when you planted them and the current size of the specimen.
If you purchased large, mature plants from a nursery, they likely don’t need much additional food.
At that stage, they have already reached their full size and are simply waiting for the cold to trigger their color.
However, if you are growing them from seed or small starts, a balanced liquid fertilizer can help.
Look for a 10-10-10 NPK ratio and apply it every two weeks until the temperatures stay consistently below 50°F.
Timing Your Nutrition
Be careful not to over-fertilize once the plant has reached its desired size.
Too much nitrogen late in the season can actually suppress the development of those beautiful fall colors.
I suggest stopping all heavy fertilization once you see the center of the plant beginning to turn pink or white.
At this point, the plant is shifting its energy from leaf production to pigment enhancement.
Think of it as a natural transition where the plant settles in for the winter display.
Your primary job shifts from “growing” the plant to simply “maintaining” its current health and vigor.
Managing Pests and Common Challenges
Even though the weather is cooling down, some pests are still very active and looking for a snack.
The most common enemy you will face is the cabbage looper or the imported cabbageworm.
These are small green caterpillars that blend in perfectly with the leaves while they chew large holes.
If you see white butterflies fluttering around your garden in early fall, they are likely laying eggs on your plants.
You can manage these pests by hand-picking them off or using an organic spray like Bacillus thuringiensis (Bt).
Bt is a naturally occurring bacterium that targets caterpillars without harming beneficial insects like bees.
Dealing with Slugs and Snails
In damp autumn weather, slugs and snails can become a significant nuisance for low-growing plants.
They love the tender leaves of the ornamental cabbage and can shred a beautiful plant overnight.
I find that a thin layer of diatomaceous earth spread around the base of the plant works wonders.
It creates a sharp barrier that slugs cannot cross, keeping your foliage pristine and hole-free.
Alternatively, you can use copper tape around the rims of your pots to provide a similar deterrent.
Keeping the area around your plants free of fallen leaves and debris also reduces the hiding spots for these pests.
Designing with Ornamental Cabbage: Pro Tips
The care of ornamental cabbage plants extends into how you choose to display them in your landscape.
Because they stay low to the ground, they make excellent border plants for walkways and garden edges.
For a high-impact look, try planting them in large “drifts” of five or seven plants rather than single rows.
Grouping them together creates a mass of color that is visible from across the street or through a window.
They also pair beautifully with other cold-hardy plants like pansies, violas, and snapdragons.
The contrast between the soft flower petals and the structural leaves of the cabbage is truly striking.
Container Gardening Success
If you have limited space, these plants are perfect for window boxes and patio containers.
They don’t have very deep root systems, so they can thrive in relatively shallow pots.
One of my favorite designs is to place a tall evergreen in the center of a large pot.
Surround the base with alternating white and purple ornamental cabbages for a classic, elegant winter look.
Remember that container plants dry out faster than those in the ground, even in the winter.
Check your pots every few days, especially if there has been a drying wind or a lack of rainfall.
The Science of the Color Change
Have you ever wondered why these plants suddenly turn from plain green to neon pink?
It is a fascinating biological process that is triggered entirely by the environment.
As the nights get longer and colder, the plant stops producing as much chlorophyll, which is green.
This allows other pigments, called anthocyanins, to become visible to the human eye.
This is the same process that causes maple leaves to turn red and orange in the autumn forest.
The colder the weather gets, the more intense these colors will become until the plant eventually freezes solid.
Protecting Plants During Extreme Freezes
Ornamental cabbages are incredibly tough and can usually survive temperatures down to about 5°F (-15°C).
However, a sudden, sharp drop in temperature can sometimes shock the plant or cause the leaves to turn mushy.
If you know a record-breaking freeze is coming, you can cover your plants with a frost blanket or burlap.
This helps trap a small amount of heat from the soil and protects the foliage from the biting wind.
Once the sun comes out and the temperature rises above freezing, be sure to remove the covers.
Leaving them on during a sunny day can cause the plants to overheat or trap too much moisture.
Frequently Asked Questions About Care of Ornamental Cabbage Plants
Can you eat ornamental cabbage?
Technically, yes, they are edible and non-toxic, but they are not grown for their flavor.
They tend to be much more bitter and have a tougher texture than culinary varieties found in the produce aisle.
How long do ornamental cabbage plants last?
With proper care of ornamental cabbage plants, they can last from early autumn until mid-winter.
In many regions, they will hold their color beautifully until a sustained period of temperatures below 10°F occurs.
Do they come back every year?
No, these are typically treated as annuals in most garden settings.
While they are biennials by nature, they usually lose their aesthetic appeal after the first winter and are replaced in the spring.
Why is my cabbage growing a tall stalk in the middle?
This is called “bolting,” and it happens when the plant thinks it is time to produce seeds.
It is usually triggered by a sudden spell of warm weather; unfortunately, once it bolts, the plant’s decorative phase is over.
Should I remove the bottom leaves if they turn yellow?
Yes, it is a good idea to prune away any yellowing or damaged leaves at the base of the plant.
This improves air circulation and keeps the plant looking tidy and healthy throughout the season.
Conclusion: Your Winter Garden Awaits
Taking the time to master the care of ornamental cabbage plants is one of the best investments you can make for your home.
These resilient plants provide a bridge of color during the darkest and coldest months of the year.
Remember to focus on the basics: plenty of sun, well-draining soil, and consistent moisture.
If you keep an eye out for caterpillars and give them a little protection during extreme freezes, they will reward you daily.
Gardening doesn’t have to end just because the summer flowers have gone to sleep.
Embrace the chill, grab your trowel, and start planting these vibrant cabbages today!
Go forth and grow a garden that shines even when the frost is on the ground.
Happy gardening!
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