Ornamental Kale Plant Care: Cold-Hardy Perennial With Velvety Foliage

Ornamental kale plant care thrives where most gardeners throw in the towel by frost—its velvety leaves stay stunning even after snowfall. 🌿 I’ve grown it for three winters now, and the secret isn’t complicated: rich soil, cool weather, and a little patience. Most people assume it’s a finicky annual, but with the right care, it’s a cold-hardy perennial that rewards you with bold colors long after other plants fade. The soil needs to be well-draining but moisture-retentive—think of it as a cross between a salad and a succulent. Water deeply once a week unless it’s raining, and avoid overhead sprinklers to keep those leaves crisp. A light layer of mulch in fall helps protect roots, and you’ll find it popping back with vibrant new growth come spring. What sets ornamental kale apart is its color retention—purples, pinks, and deep greens stay vivid even under snow. It’s also surprisingly pest-resistant, meaning fewer headaches than your average garden plant. The key is treating it like the tough, resilient beauty it is, not a delicate ornament. Perfect for borders, containers, or even as a winter salad base. Here’s how to keep it thriving through every season—no greenhouse required.

What you need

Step-by-step guide to caring for ornamental kale

This cold-hardy beauty thrives with minimal fuss—just a few key steps to keep those velvety leaves stunning all season.

Choose a spot with 6+ hours of direct sun daily—ornamental kale loves bright light to develop its vibrant colors. Amend your garden soil with 2-3 inches of compost before planting, as this cold-hardy perennial prefers fertile, well-draining conditions. If your soil feels heavy or clay-like, mix in 1 part perlite to 3 parts soil to improve drainage.

Plant in early spring or late summer, giving roots time to establish before winter. Space plants 12-18 inches apart to allow airflow and prevent fungal issues. I like to dig a hole twice as wide as the root ball but only as deep—planting too deep can suffocate the crown and lead to rot.

Water once a week during the first growing season, giving each plant 1-1.5 gallons of water at the base. Let the top 2 inches of soil dry out between waterings—this prevents soggy roots while keeping leaves lush. Ornamental kale is drought-tolerant once established, but young plants need consistent moisture to develop strong roots.

Water in the early morning to allow foliage to dry before evening. Wet leaves at night invite fungal diseases like downy mildew, which can ruin those stunning colors. You'll know your watering is right when the soil feels slightly damp 2 inches down but not saturated.

Deadhead spent flowers in early summer to redirect energy into foliage production. Use clean, sharp shears to snip just above a set of leaves—this encourages bushier growth and prevents leggy stems. I also trim any yellow or damaged leaves immediately, as they can attract pests and spread disease.

For a more compact plant, pinch back the growing tips when they reach 6 inches tall. This forces the plant to branch out, creating a fuller, more ornamental look. The best time to prune is on a cool, overcast day—this reduces stress on the plant and prevents sunburn on fresh cuts.

Ornamental kale handles cold beautifully, but prolonged sub-zero temperatures can damage tender foliage. Once temperatures drop below 20°F, mulch plants with 2-3 inches of straw or shredded leaves to insulate roots. This prevents heaving and keeps the crown protected.

If you live in a region with extreme winter winds, consider wrapping plants in frost cloth during the coldest months. Check plants in early spring—if the center looks browned or mushy, trim back damaged growth to encourage fresh, vibrant foliage. Healthy plants will bounce back quickly once temperatures rise above 40°F.

Feed plants once in early spring with a balanced, slow-release fertilizer (10-10-10 ratio). Use about ½ cup per plant and work it into the top 2 inches of soil. Avoid high-nitrogen fertilizers—they promote leafy growth at the expense of color intensity, which is what makes ornamental kale so stunning.

In late summer, switch to a low-nitrogen, high-phosphorus fertilizer (like 5-10-10) to encourage root development before winter. Water deeply after fertilizing to help nutrients soak into the soil. You'll notice richer colors and sturdier stems within 3-4 weeks of feeding.

Tips & tricks for perfect ornamental kale care

Between us, these little details make all the difference in keeping your ornamental kale looking like a showstopper all season long.

Soil Prep Secret: Before planting, I always do a quick soil test by squeezing a handful of moist soil. If it holds its shape like a brick, you definitely need that perlite mix—it's the difference between thriving plants and struggling ones. The 2-3 inches of compost isn't just about nutrition; it helps create that perfect balance of moisture retention and drainage that ornamental kale craves.

Watering Wisdom: That once-a-week watering guideline assumes average conditions, but your mileage may vary. I check soil moisture by sticking my finger 2 inches down—if it feels dry, water deeply. The early morning timing is non-negotiable though; I've seen downy mildew ruin beautiful plants overnight when water sits on leaves too long. Think of it as your plant's morning shower routine.

Pruning Pro Move: When deadheading in early summer, I make it a point to look for those tiny flower buds forming. Snip them off at the base with clean shears—this isn't just about looks, it redirects the plant's energy back into those stunning leaves. And that 6-inch pinch-back rule? I've found plants actually respond better at 5 inches if you want extra bushiness, but stick to the instructions for consistency.

Winter Survival Hack: The 20°F threshold is your warning sign, but I've learned to watch the forecast too. If we're expecting a hard freeze below 10°F, I double up on mulch to 3-4 inches. That extra insulation can mean the difference between browned foliage and plants that bounce back beautifully when spring arrives. The 40°F check in early spring is your cue to start trimming back any winter damage—healthy growth starts when temps consistently stay above this mark.

Frequently asked questions

Got questions about keeping your ornamental kale thriving? Here are some of the most common concerns—and their solutions!

How cold can ornamental kale tolerate?

Ornamental kale is extremely cold-hardy, surviving temperatures down to 15°F (-9°C) with proper care. In zones 5-9, it thrives as a winter perennial! Just mulch heavily in late fall to protect roots from extreme freezes. Learn more about winter prep.

Can I grow ornamental kale in containers?

Choose a container at least 12 inches deep with drainage holes. Use well-draining potting mix and place it in full sun. Containers dry out faster, so water daily in hot weather. Just be mindful of wind—secure pots to prevent tipping!

What pests should I watch for?

Common pests include aphids, cabbage worms, and slugs. Spray plants with water to dislodge aphids, handpick worms, or use beer traps for slugs. For severe infestations, try neem oil or insecticidal soap. Explore natural remedies.

How long does ornamental kale last in the garden?

As a biennial, it typically lives 2 years but may bolt (go to seed) in its second year. To extend its life, deadhead spent flowers and harvest leaves early. For year-round color, replant new varieties every fall or spring.

Can I eat ornamental kale like regular kale?

Yes! While bred for color, ornamental kale is edible and nutritious. Young leaves are milder and sweeter. Blanch or sauté for best flavor. Just avoid heavily frosted leaves—they can be bitter. Try these recipes!

Pro Tip:

For extra-long-lasting color, plant varieties like 'Russian Red' or 'Dwarf Blue Curled'. These hold their hues best in cold weather!

Wrapping up and next steps

Caring for ornamental kale is a rewarding journey that brings vibrant color and texture to your garden—even in chilly weather! 🌿 With the right sunlight, soil, and watering habits, you’ll enjoy its stunning foliage for months.

Whether you’re a beginner or a seasoned gardener, these tips make it simple to nurture this cold-hardy beauty.

Ready to transform your space? Grab your gloves, pick a spot, and plant your ornamental kale today—your garden (and future harvests) will thank you!