A cool-season root vegetable that rewards loose, deep soil with sweet, crisp taproots ready in 70–80 days from sowing.
Daucus carota subsp. sativus · also called garden carrot, cultivated carrot
Windows are counted from the average date of your last spring frost.
Home-grown carrots harvested at peak maturity are markedly sweeter than store-bought, particularly after a light frost triggers the root to convert stored starches to sugars as a cold-tolerance response. Dozens of varieties — from stubby Chantenay types to slender Nantes — are unavailable in any supermarket.
A little history. Carrot is a biennial grown as an annual; it produces its edible taproot in year one and flowers in year two. Domesticated from wild carrot native to Central Asia, with purple- and yellow-rooted forms documented in Afghan cultivation by the 10th century CE.
Sow seeds ¼ inch (6 mm) deep, and aim for 3 inches (8 cm) between plants once thinned. Keep the top half-inch constantly moist — carrot seeds are tiny and the crust will block emergence; lay a board or burlap over the row and check daily, removing it the moment sprouts appear. Seedlings emerge in 10–21 days.
Water deeply twice a week; reduce frequency once roots are established but never let soil dry out completely. Water when the top inch of soil feels dry to the touch. Aim for about 1 inch per week including rain.
Side-dress (scatter fertilizer along the row and water in) once at thinning and again at 6 weeks after sowing. What to use: low-nitrogen, higher-phosphorus fertilizer such as 5–10-10 organic; excess nitrogen drives leafy tops at the expense of roots.
It's ready when shoulder (the top of the root at soil level) is 0.5–0.75 inches across; check by brushing soil aside. Days-to-maturity on the seed packet is a reliable guide — taste one root to confirm sweetness. Loosen soil 4–6 inches from the root with a fork, then grasp the foliage close to the crown and pull steadily. Avoid yanking without loosening — roots snap. Harvest before the ground freezes hard.
Twist off tops to 0.5 inch, brush off soil, and store unwashed in perforated plastic bags in the refrigerator crisper at 32–40 °F (0–4 °C) for up to 4 weeks. In-ground storage under heavy mulch extends this through mild winters.
Sow every 3 weeks from early spring through midsummer for a continuous harvest; make the final sowing 10–12 weeks before first fall frost.
Onion
The onion's strong smell can help hide the carrot's own scent from carrot rust fly, which finds the row by odor. Trials show it only helps when onions are planted thickly alongside the carrots, not as a token edge row.
Leek
Leeks hold their pungent foliage all season, so they often reduce carrot rust fly pressure for longer than bulb onions, which fade once they mature. Alternate a full row of leeks with a full row of carrots for any real effect.
Lettuce
Lettuce feeds in the top few inches while the carrot taproot works far deeper, so the two rarely fight for water. Fast lettuce also marks the row during the slow 10 to 21 day carrot germination and is cut long before the roots size up.
Rosemary
Gardeners have long set rosemary at the end of the carrot bed in the belief that its resinous scent confuses carrot rust fly. Field evidence is thin, so treat it as a bonus and rely on fine insect mesh for actual protection.
Tomato
Old companion charts keep carrots at the foot of tomatoes, and no mechanism has been demonstrated. It is workable in practice as long as the tomato canopy does not shade the row heavily, since carrots grown in deep shade stay small.
Dill
Dill and carrots are separate plants and cannot cross, despite the old claim. The real problem is that mature dill is tall, greedy for water and light, and hosts the same carrot family pests. Grow dill in another bed and let it flower there.
Parsnip
Parsnip is in the same family and carries the same leaf blight, carrot rust fly, and root-tunneling weevils, so side-by-side rows stack the risk and leave infected debris in one spot. Keep them in separate beds and separate rotations.
Celery
Carrots share celery's leaf-spot diseases and are the main host of carrot rust fly, so a mixed planting builds both problems in one spot. Keep them in separate beds and separate rotation slots.
Skirret
Carrot and skirret feed the same carrot fly generations and host the same root rots, so a mixed bed lets pest and spore numbers build through the season. Keep them in separate beds and mesh each one.
Horseradish
Every root fragment left in the ground sprouts a new plant, so horseradish steadily colonizes a bed. Digging carrots chops and scatters those fragments, and the following season you are weeding horseradish out of the carrot rows. Keep it in its own confined corner.
Crimson Clover
Carrots germinate slowly and stay small for weeks, which a dense clover stand easily overruns. Plant clover as the cover before or after carrots rather than alongside them.
Phacelia
Phacelia is up and branching in two weeks while carrots are still hair-thin seedlings, and its lacy canopy shades them out. Keep it to the bed edge or a separate patch rather than sowing it through a carrot row.
Sudangrass
Small-seeded, slow-starting root crops often come up thin and stunted in beds where this grass was recently turned under. Give the bed a full month, or sow a transplanted crop first instead.
Field Mustard
Fresh mustard residue often thins a carrot sowing, since carrot seed is tiny and takes two weeks to emerge even in clean ground. Let the chopped tops break down for 2-3 weeks, then rake and sow.
Give the carrot family 3 years away from this spot before any of its relatives return.
The pea and bean family, the cabbage family or the onion family thrive in this ground next season.
Carrots are light feeders and leave the bed loosened by their taproots, with little residue to break down. Keep the carrot family (parsnip, parsley, celery, dill) out of this ground for 3 years. Follow with legumes to rebuild nitrogen, or with brassicas or the onion family.
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