By Nik Crawley, founder of GardenTrack · Updated July 22, 2026
✓ In your garden
Cosmic Purple is the carrot that surprises people twice. First, it's not purple all the way through — the reddish-purple is skin-deep, wrapped around a bright orange core, so slicing one crosswise gives you a two-tone bullseye. Second, that purple is water-soluble: boil the carrot and the color rinses straight into the pot. Bred by the USDA and released in 2005, it's a genuinely good eating carrot — sweet with a faint peppery edge — as long as you roast it or eat it raw and don't expect solid purple inside.
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a purple carrot sliced open lengthwise, held in hand — a reddish-purple outer layer wrapped around a bright orange core, showing that the purple is only skin-deep · Photo: Rob Swystun
(CC BY 2.0, via Wikimedia Commons)
· source
Purple skin, orange coreUSDA-bred (2005)Sweet with a bit of spice
“A USDA-bred carrot that's purple only skin-deep — slice one crosswise and you get a bright orange bullseye, and that purple rinses straight into the pot the moment you boil it.”
Days to maturity65–75 daysmost catalogs list 70
Colorreddish-purple skinbright orange/yellow core — not purple through
Best sownspring & mid-summeropen-pollinated; save seed true
Looks (raw)Two-tone bullseye 5/5
Cut crosswise it reads as a purple ring around an orange center; grated raw it throws pink-purple color through a slaw. The visual is the whole reason to grow it, and raw it delivers.
FlavorSweet + a little spice 5/5
Sweet, mild, and genuinely snackable raw — 'sweet with a bit of spice,' the purple skin carrying a faint peppery edge over the sweeter orange core. A light fall frost pushes it sweeter still. Not a novelty-only carrot.
Purple through?No — skin-deep 2/5
The core is orange/yellow, not purple. Buyers expecting solid purple are disappointed — this is the opposite of dark-to-the-core types like Deep Purple or Black Nebula, and the same orange-cored pattern as Purple Haze.
Color survives cooking?Boiling kills it 2/5
The purple is water-soluble anthocyanin, so boiling leaches it into the water (and tints everything else in the pot a muddy blue-gray). Cooking trials confirm boiling transfers the pigment out while roasting preserves it. Roast, don't boil.
Gorgeous and sweet raw — just know it's orange inside, and boiling washes the purple away.
SweetMildFaintly peppery skinCrunchy
✓ Sweet, snackable, stunning raw~ Orange inside — purple is skin-deep✗ Don't boil it — the color rinses out
Numbers from university growing guides. Ratings are our take, judged against all carrots. Tap a meter to see why.
Growing basics — shared by every carrot
Cosmic Purple grows like any other carrot. The full picture — how deep to plant, spacing, feeding, pests, harvest — lives on the Carrot page so it's maintained in one place.
Greenhouse or cover on: your start slides ~4 weeks earlier and your harvest stretches ~3 weeks later (shown striped).
Planting seeds straight in the ground only works where the season's long and warm — most gardeners start seeds indoors or buy young plants, or you'd pick your first tomato right as frost hits.
Comfortable — first ripe fruit lands around late May, well before your typical frost (~late Oct).
Plant seeds outside
late Mar – early Apr
Growing
early Apr – late May
Picking
late May – late Jun
Typical dates for zone 6b — set your zone or ZIP above for yours.
What to plant near Cosmic Purple — and what to keep away
✓ Good neighbors
Onions & garlicTrialed
Interplanted onions confused carrot rust fly in some trials and did nothing in others. Worth a try, not a bet.
LettucePractical
Quick lettuce fills the row while slow carrots take their time.
RadishPractical
Radishes sprout in days, mark your carrot row, and are gone before carrots need the space.
PeasTraditional
The classic cool-season pair.
TomatoTraditional
'Carrots Love Tomatoes' is a book title, not a trial. They coexist fine — just expect the tomato to shade them by August.
✗ Keep apart
DillTraditional
Same family, same pests, and mature dill is said to stunt carrots. 'Said' is doing some work there — but why risk it.
The badge is the honesty.Trialed = a published field trial · Practical = a real mechanism · Traditional = companion-chart lore. These pairings hold for every carrot.
Pairings compiled from University of Minnesota Extension, West Virginia University Extension.
Growing Cosmic Purple — the things that trip people up
Direct-sow only — carrots resent transplanting. Sow 1/4–1/2 inch deep in deep, loose, stone-free soil, keep the seedbed constantly moist through the slow 2–3 week germination, and thin ruthlessly to 2–3 inches apart. It handles heavier soil better than most carrots but still forks in compacted or rocky ground.
Know what you're growing: reddish-purple skin over a bright orange core, not purple all the way through. If you want solid purple, grow a dark-to-the-core type instead.
To keep the color on the plate, roast or eat it raw — never boil it. Boiling leaches the water-soluble purple into the water and dulls the carrot. Set your zone on the [carrot page](/plants/carrot/) to pin your sow and harvest dates.
From university growing guides (see Sources).
Where Cosmic Purple comes from
Cosmic Purple was bred in the United States at the USDA Agricultural Research Service station in Madison, Wisconsin, under carrot geneticist Dr. Philipp Simon, and released in 2005 as part of the modern revival of colored 'rainbow' carrots. It's open-pollinated — not an F1 hybrid — so you can save its seed true-to-type.
There's a nice piece of history hiding in it: purple and yellow were the carrot's original domesticated colors, with orange a much later selection. So Cosmic Purple, with its purple skin, is actually closer to the ancestral carrot than the standard orange grocery root.
Purple only skin-deep
This is the single most misunderstood thing about Cosmic Purple, so it's worth saying plainly: it is not purple all the way through. The reddish-purple lives in the outer layer only, wrapped around a bright orange-to-yellow core. Cut one crosswise and you get a purple ring around an orange center; cut it lengthwise and you get a purple rind over an orange middle.
That's a feature if you know to expect it and a letdown if you don't. It's the opposite of dark-to-the-core types like Deep Purple, Purple Sun, and Black Nebula, and it's the same orange-cored pattern as Purple Haze. If solid purple flesh is what you're after, grow one of the dark-to-the-core varieties instead — Cosmic Purple is the bullseye, not the block of color.
The purple washes out when you boil it
The purple pigment is anthocyanin, and anthocyanin is water-soluble — which has a very practical consequence in the kitchen. Boil or simmer Cosmic Purple and the color leaches straight into the cooking water, dulling the carrot and tinting everything else in the pot a muddy blue-gray. Peer-reviewed cooking trials back this up: boiling transfers the anthocyanins into the water, while roasting actually preserves or even deepens the pigment.
So the rule is simple — roast it or eat it raw if you care about the color. Grated or juiced raw it also stains: expect pink-to-purple tinting on slaw, fingers, cutting boards, and any pale ingredient it touches. Lean into that as a design feature, or add it last.
roasted Cosmic and Purple Haze carrots plated with microgreens — the purple roots keep their color because they were roasted, not boiled · Photo: Arnold Gatilao
(CC BY 2.0, via Wikimedia Commons)
· source
Growing Cosmic Purple
Direct-sow only — carrots resent transplanting because the taproot is easily damaged. Sow 1/4–1/2 inch deep in deep, loose, stone-free soil, rows 12–18 inches apart, starting a couple of weeks before your last frost and continuing through midsummer for a fall crop. Germination is slow and uneven — 2 to 3 weeks — so keep the surface evenly moist the entire time and don't let it crust over.
Thin seedlings to roughly 2–3 inches apart or the roots stay small and twisted. Harvest around 65–75 days, when the shoulders reach about 3/4 to 1 inch across. Cosmic Purple handles heavier soils better than most carrots, but it still forks in compacted or rocky ground — and a fall crop left through a light frost sweetens noticeably.
What goes wrong — and the fixes
Forked, hairy, or stunted roots. Almost always rocky, cloddy soil or fresh manure/high nitrogen. Fix: sow in deep, loose, stone-free soil and skip the fresh manure.
Patchy germination and crowded roots. The seedbed dried out, or you never thinned. Fix: keep the surface constantly moist for the full 2–3 weeks, then thin ruthlessly to 2–3 inches.
Color 'vanishing' after cooking. That's the boiling, not bad seed — the water-soluble purple leaches into the pot. Fix: roast or steam instead. And mound soil over any shoulders that push up out of the ground, or they green and turn bitter. Row cover keeps carrot rust fly and leafhoppers (which spread aster yellows) off the bed.
In the kitchen
Cosmic Purple earns its keep raw. It's sweet, crunchy, and snackable straight from the garden, and grated into a slaw it throws pink-purple color through the whole bowl — a genuine design feature if you time it right. It's a striking crudité and a good juicing carrot, where the anthocyanin color is the selling point.
When you cook it, roast it. Roasting keeps — even deepens — the purple and concentrates the sweetness, where boiling would wash the color into the water and leave you with a dull carrot in a gray pot. It's the rare novelty-colored carrot whose eating quality actually holds up, so treat it as a real carrot, not just a garnish.
Cosmic Purple carrot at a glance
Cosmic Purple Carrot — at a glance
Type
Imperator
Days to ripe
70 days after you plant it outside
Color
Purple, Orange
Fruit size
Medium
Extra fields from seed-catalog listings and university growing guides. Days to ripe and disease resistance shift with your climate and seed source — double-check with your local extension office before you buy.
Watch: growing Cosmic Purple
COSMIC PURPLE CARROTS | easy to grow & delicious variety! · Growing Organic TV ShowPlanting Cosmic Purple Carrots in a Grow Bag · MountainViewGardens
Embedded from their creators on YouTube — full credit and views go to the channel.
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Common questions about Cosmic Purple
Is Cosmic Purple carrot purple all the way through?
No — that's the most common surprise. The reddish-purple is only skin-deep, wrapped around a bright orange-to-yellow core, so cut crosswise it looks like a purple ring around an orange center. It's the opposite of dark-to-the-core types like Black Nebula or Deep Purple. If you want solid purple flesh, grow one of those instead.
Why did my purple carrots lose their color when I cooked them?
You boiled them. The purple is a water-soluble pigment (anthocyanin), so boiling or simmering leaches it straight into the cooking water and can tint the rest of the pot a muddy gray. Cooking studies show roasting preserves or even deepens the color — so roast or eat it raw if the purple matters.
What does Cosmic Purple carrot taste like?
Sweet, mild, and classically carroty with good crunch — often described as 'sweet with a bit of spice,' the purple skin carrying a faint peppery edge over the sweeter orange core. A light fall frost makes it sweeter. It's genuinely good eating, not a novelty-only carrot.
Is Cosmic Purple hard to grow?
No harder than any carrot, and a bit more forgiving of heavy soil than most. Direct-sow it (carrots hate transplanting), keep the seedbed moist through the slow 2–3 week germination, and thin to 2–3 inches. It still needs loose, stone-free soil to avoid forking, and it's open-pollinated so you can save the seed.
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