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How to Grow Carrots: 5 Tips for a Better Harvest

Carrots are one of our family’s favorite vegetables to grow. There’s nothing quite like pulling one from the garden, rinsing it off, and eating it right there.

They’re also one of those crops that seem simple until you try to grow them. The biggest challenges are planting at the right time, keeping the tiny seeds moist long enough to germinate, and thinning the seedlings so the roots have room to develop.

Get those things right, and carrots are pretty easy to grow. Here are five things that make the biggest difference.

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1. When and Where to Plant Carrots

When to Plant Carrots

Carrots grow best in cool weather. Plant seeds directly in the garden when soil temperatures are between about 45°F and 85°F (7°C to 29°C). The roots develop their best flavor and sweetness when they mature in cool soil.

In the low desert of Arizona, I start planting carrots around mid-September, but I watch the weather before I sow. I’m looking for nighttime temperatures in the 70s and daytime highs that are beginning to come down.

If we’re still in a September heat wave, I wait. Carrot seeds are planted shallowly, and hot, dry soil makes germination much more difficult.

Once conditions improve, plant carrots throughout the cool season. Get the last seeds into the ground before March. March planting should mainly be used to fill a few empty spots; aim to have most of your carrots planted earlier so they have time to develop before temperatures climb.

Carrots are one of 10 go-to vegetables I recommend for fall gardens in the low desert and other mild climates.

Where to Plant Carrots

Choose a spot with loose, well-drained soil free from rocks and fresh manure. Rake the bed smooth before planting. Compacted or rocky soil can cause roots to fork or become misshapen.

Carrots also grow well in containers and grow bags as long as they’re deep enough for the variety you’re growing.

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2. Plant Carrot Seeds Directly in the Garden

Don’t buy carrot transplants. Carrots develop a taproot almost immediately and don’t like having that root disturbed. Learn more about crops with sensitive roots in this guide. Sow seeds directly where you want them to grow.

Plant seeds about ¼ inch (0.6 cm) deep.

Carrot seeds are tiny, so use whichever type makes planting easiest for you:

• Regular seeds: The least expensive option, but the tiny seeds can be difficult to space evenly.
• Seed tape: Seeds are already spaced along biodegradable tape, which can make planting faster and reduce thinning later.
• Pelleted seeds: A coating makes each seed larger and easier to handle and place individually.

Carrots come in much more than orange. You can grow purple, red, yellow, white, and orange varieties in different shapes and sizes.

• Danvers varieties are sweet, crisp, full-flavored, and easy for the home gardener to grow. Best for eating fresh and shorter storage.
• Imperator varieties store well.
• Chantenay varieties are good all-purpose carrots that can handle heavy soils.
• Nantes types are best for fresh eating, often considered the sweetest and most tender type of carrots.

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3. Germination and Thinning: The Two Keys to Successful Carrots

Help Carrot Seeds Germinate

Carrot seeds are slow to germinate, and the top layer of soil needs to stay consistently moist while you wait. This is often the hardest part of growing carrots, especially during our warm fall weather.

After planting, water gently so you don’t wash the tiny seeds away. Check the soil often and water as needed to keep the surface from drying out. In warm, sunny weather, that may mean watering more than once a day until the seeds germinate.

In hot weather, I sometimes cover the planted area with burlap or a board to help hold moisture in the soil. Check underneath every day and remove the covering as soon as you see seedlings emerging. A thin layer of straw can also help keep the soil moist without having to remove a covering.

Once the seedlings are up, gradually transition to deeper, less frequent watering.

Thin Carrots So the Roots Have Room to Grow

Don’t skip thinning. Crowded seedlings may give you lots of carrot tops but small, skinny roots underneath.

About two weeks after germination, remove seedlings that are touching. A couple of weeks later, thin again so the remaining carrots are about 2 to 3 inches (5 to 7.5 cm) apart.

If pulling seedlings disturbs the carrots you want to keep, snip the extras off at soil level instead. Give the remaining carrots enough room and they’ll have a much better chance of developing full-sized roots.

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4. Caring for Carrots as They Grow

Now that your carrots are sprouting, it’s time to give them the care they need to grow big and flavorful.

If your carrots suddenly send up a flower stalk instead of forming a root, they may be bolting—learn more in Why Carrots Bolt in Their First Year (And What You Can Do About It).

Deep Watering: Carrots develop long taproots, so deep watering is essential to encourage those roots to grow downward. Aim to moisten the soil to a depth of 6-12″ (15-30 cm). Deep watering helps the roots seek moisture deep in the soil, leading to straighter and longer carrots. Avoid shallow, frequent watering, as this can cause the roots to stay near the surface and become stunted. Sudden changes in moisture can cause the roots to crack or split. Learn more about how to water gardens in this guide.

Weeding: Keep the area around your carrots free of weeds. Weeds compete with your carrots for nutrients, water, and sunlight.

Mulching: Applying a layer of mulch, such as straw or shredded leaves, around your carrots helps retain soil moisture, suppress weeds, and regulate soil temperature. A thin layer—about 1″(2.5 cm)—is sufficient. Don’t cover the carrot tops; they need sunlight to grow properly.

Fertilizing: Carrots aren’t heavy feeders but appreciate nutrient-rich soil. If your soil is lacking, consider side-dressing with compost midway through the growing season. Avoid fertilizers high in nitrogen, as they promote leafy growth over root development.

Hilling: If you notice the tops of your carrots starting to protrude above the soil, gently mound some soil or mulch over them. Exposed carrot shoulders can turn green and bitter due to sun exposure.

White spots on carrot tops late in the season may be powdery mildew—find out what to do in Powdery Mildew on Carrots: Causes and Solutions.

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5. Carrot harvesting and storage tips

If you aren’t sure if carrots are ready to harvest, remove soil from around the tops of the carrot roots. Harvest carrots when tops are about 1″ (2.5 cm) in diameter. The top may begin to “pop” out of the soil. 

Harvest the largest carrots first to give the smaller carrots room to develop. Fully developed carrots will have a bit of blunting at the end of the tip and have good flavor.  

Leave carrots in the ground until ready to eat, but harvest carrots before the summer heat if you live in very hot places like Arizona. (The heat can turn them bitter.)

• A tip to remember — the shorter variety carrots are best eaten fresh, while longer carrots are more suited to storing.
• Carrots store best if you clip the foliage, leaving about 1 inch of stem. Leaving the greens on the carrots draws moisture out of them, causing limp carrots. 
• Let washed carrots air dry before storing them in the refrigerator. Store them in a sealed ziplock-style bag, and they will last for months.
• When ready to use harvested carrots, scrub, but don’t peel them! Many vitamins are in the skin or close to the surface.

Freeze-drying carrots is a simple way to preserve extra harvests. Learn more about freeze-drying in this blog post.

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