You get purple carrots by growing specific varieties that naturally produce anthocyanins, the same pigments that make blueberries blue and eggplants purple.
While orange carrots are the most common type today, purple carrots actually came first historically.
If you’ve ever wondered how do you get purple carrots, the answer lies in both the seeds you choose and the growing conditions you provide.
In this post, we’ll explore how you get purple carrots, the best varieties to grow, and tips to make sure they develop that deep, vibrant color.
Let’s dig in.
How Do You Get Purple Carrots: The Science Behind the Color
You get purple carrots when the plants produce high levels of anthocyanins in their taproots.
Here’s what’s happening:
1. It All Starts With the Right Seeds
The most important step in how you get purple carrots is choosing the right variety.
You can’t grow purple carrots from standard orange carrot seeds any more than you can grow red apples from green apple seeds.
Purple carrot varieties have been bred over centuries to express anthocyanin pigments.
Some popular purple carrot varieties include Cosmic Purple, Purple Haze, Deep Purple, and Black Knight.
When you plant these seeds, the genetics are already there.
You’re just providing the environment for those purple pigments to develop fully.
2. Anthocyanins Are the Key Pigment
Anthocyanins are water-soluble pigments responsible for red, purple, and blue colors in many fruits and vegetables.
When you get purple carrots, it’s because these anthocyanins accumulate in the root’s outer layers and sometimes throughout the entire taproot.
The more anthocyanins the carrot produces, the deeper and richer the purple color becomes.
This is why some purple carrots look almost black while others have a lighter violet hue.
3. Temperature Plays a Big Role
Cool temperatures during the growing season help you get purple carrots with better color development.
Anthocyanin production tends to increase when carrots experience cooler weather, especially during the final weeks before harvest.
If you’re growing purple carrots in hot climates, you might notice the color isn’t as intense.
That’s because heat can slow down anthocyanin synthesis.
So if you want to get purple carrots with that striking deep color, plant them so they mature in cooler weather.
Best Conditions to Get Purple Carrots
How do you get purple carrots that are vibrant and healthy?
It comes down to giving them the right growing environment.
1. Well-Drained, Loose Soil
Purple carrots need loose, well-drained soil to develop straight, healthy roots.
Rocky or compacted soil causes carrots to fork, split, or grow crooked.
Before planting, work the soil at least 10 to 12 inches deep and remove stones or clumps.
Sandy loam is ideal for how you get purple carrots with smooth, uniform shape.
2. Consistent Moisture
Purple carrots need steady moisture throughout the growing season.
Too little water stresses the plants and can reduce anthocyanin production.
Too much water can cause roots to crack or rot.
Aim for about one inch of water per week, either from rain or irrigation.
Mulching around your carrots helps retain moisture and keeps the soil temperature stable.
3. Full Sun for Strong Growth
Purple carrots grow best in full sun, which means at least six to eight hours of direct sunlight daily.
Sunlight supports photosynthesis, which fuels the plant’s ability to produce sugars and pigments.
When you get purple carrots grown in shady spots, they tend to be smaller and less colorful.
4. Proper Spacing and Thinning
To get purple carrots that reach their full potential, thin your seedlings properly.
Purple carrot seeds are tiny, and it’s easy to plant them too close together.
Once seedlings are about two inches tall, thin them so they’re spaced two to three inches apart.
Crowded carrots compete for nutrients and water, and they often end up small and pale.
5. Balanced Fertilizer
Purple carrots don’t need heavy feeding, but they do benefit from balanced soil nutrients.
Avoid too much nitrogen, which encourages leafy growth at the expense of root development.
Instead, focus on phosphorus and potassium, which support root growth and pigment formation.
Compost worked into the soil before planting is often enough to get purple carrots off to a strong start.
How Do You Get Purple Carrots vs Orange Carrots
You might be wondering why orange carrots became the norm if purple ones came first.
Historically, purple carrots originated in Central Asia and the Middle East thousands of years ago.
Orange carrots were developed later through selective breeding in Europe.
The orange color comes from beta-carotene, while purple comes from anthocyanins.
So when you get purple carrots, you’re actually growing a more ancient version of the vegetable.
Interestingly, some purple carrots are orange on the inside with purple skin.
Others are purple all the way through.
It depends on the specific variety you choose to plant.
Health Benefits of Purple Carrots
Purple carrots aren’t just visually striking; they’re also packed with nutrients.
The anthocyanins that give them their color are powerful antioxidants.
Studies suggest anthocyanins may support heart health and reduce inflammation.
Purple carrots also contain beta-carotene and other vitamins just like orange carrots.
So when you get purple carrots in your garden, you’re growing a vegetable that’s both beautiful and nutritious.
So, How Do You Get Purple Carrots?
You get purple carrots by planting purple carrot varieties and providing the right growing conditions.
The genetics come from the seeds, but the color develops best with cool temperatures, consistent moisture, and loose, well-drained soil.
Whether you’re growing Cosmic Purple or Black Knight, the process of how you get purple carrots is part science and part good gardening.
With a little patience and the right care, you’ll harvest carrots that are as stunning as they are delicious.