The Best Asian Greens for North Carolina

Mizuna, tatsoi, komatsuna, baby bok choy and the mustards are the safest bets across North Carolina. They grow fast in cool weather and shrug off light frost. Sow them in fall first and early spring second. Summer belongs to a different group, amaranth and malabar spinach, which thrive in the heat that makes bok choy bolt. Napa cabbage and Chinese broccoli sit in between and need more careful timing.

The short answer for North Carolina

The best Asian greens for North Carolina are the quick leaf types: mizuna, tatsoi, komatsuna, bok choy and mustards, grown in fall and again in early spring. Heat-loving greens fill the summer gap, and heading napa cabbage works as a fall crop only. The reason is the shape of the season.

At the Charlotte reference station, the last spring freeze (32°F) falls between March 23 and April 5. The first fall freeze falls between October 30 and November 8. Those dates mark the band where a 32°F freeze has a 30 to 70 percent chance of showing up, based on 1991-2020 NOAA normals. In any single year the freeze can land on either side of the band. Charlotte is Piedmont country. The Blue Ridge runs several weeks later in spring, and the coastal plain runs earlier.

Winters are mild by northern standards. The coldest month at Charlotte has a mean daily minimum of 31.8°F, so most nights hover around freezing and hard, killing cold is the exception. Hardy Asian greens sit through that without much fuss. For more on the whole crop group, see Growing Asian Greens in North Carolina.

Which Asian greens suit fall and early spring?

Pick by type, because the types behave very differently once the weather warms.

Fall is the strongest window. Sow in late summer so plants have size by the October 30 to November 8 band, then harvest through the cool months. Spring sowing starts before the March 23 to April 5 band, since the hardy types do not need to wait for it. Exact sowing dates by type are in When to Sow Asian Greens in North Carolina.

Which Asian greens handle a North Carolina summer?

Amaranth and malabar spinach. Both come from warm climates and grow best once nights stay mild. Sow them after the spring freeze band has passed, and expect the first fall freeze to finish them. Chinese broccoli can stretch into late spring, but it still prefers cooler weather.

What will not work here

Spring-sown napa cabbage is the classic disappointment. A head needs weeks of cool weather to fill, and the gap between a late March or early April last freeze and the first hot spell is short. Plants sown in spring tend to bolt before they head. Treat napa as a fall crop.

Full-size bok choy sown in April has the same problem on a smaller scale. Warming days and lengthening light push it to send up a flower stalk, and the leaves turn bitter. Baby-size harvests, taken soon after sowing, finish before the stalk shows.

Summer sowings of brassica greens struggle across the Piedmont and the coastal plain, where summers are hot and humid. Seed germinates poorly in hot soil, seedlings bolt young, and leaf-eating insects build up. Waiting for late summer to sow is better than forcing a July crop.

Close spacing causes trouble in this humidity. Heavy dews and afternoon thunderstorms keep leaves wet, and crowded rosettes stay damp longest. That invites leaf spots, rot and slugs. Give each plant room, and cut outer leaves so air can move through the center.

Heat lovers have their own limit. Amaranth and malabar spinach cannot take a freeze, so sowing them before the March 23 to April 5 band risks losing seedlings to a late cold night. They also will not overwinter outdoors, since the first freeze arrives between October 30 and November 8 at the reference station.

Late fall sowing fails quietly. Plants that are still seedlings when the freeze band arrives grow very slowly through winter and give little to pick. They sit there until spring warmth, when they bolt. Sowing earlier gets size on them while the soil is still warm.

What changes across North Carolina

North Carolina is not one garden. The USDA Plant Hardiness Zone Map (2023 edition) puts the state across zones 5b to 8b, built on a single variable, the average annual extreme minimum temperature. That is a spread of several zones, so there is no single answer for the state.

Hardiness zones describe whether a plant survives the winter cold. Most Asian greens are sown fresh each year, so the frost dates and summer heat matter more. Zone still counts for anyone who wants greens to stand through winter, because the colder end of the range pushes tender types out of the picture.

Readers in the mountains should push spring sowing several weeks later than the Charlotte dates, since the Blue Ridge runs later in spring. Fall sowing should start earlier, because freezes arrive sooner at altitude. Summers are cooler there, which often leaves room for bok choy and napa that bolt in the Piedmont heat. A shaded bed helps further.

On the coastal plain, spring comes earlier and winters are milder, so overwintering is more dependable. The heat and humidity of summer can be just as hard on greens, and damp air makes spacing more important. Piedmont gardeners sit between the two.

The USDA Plant Hardiness Zone Map lets anyone look up their zone by ZIP code. Use it to see where you fall in the 5b to 8b spread, then shift the Charlotte-based dates earlier or later to match.

Where to check this for your own county

A county recommendation beats a state one. A statewide overview averages mountains, Piedmont and coast into one set of dates, and a county office works from the soils and weather in your own backyard.

Start with North Carolina State Extension and find your county center. There are two things to look for. One is the local vegetable planting calendar, which shows sowing windows for cool-season crops where you live. The other is any variety trial results for leafy brassicas, since a type that performed well in your county’s soil and weather is a better pick than one that did well elsewhere.

County staff and Extension Master Gardener volunteers can also tell you about local problems, such as which insects hit brassicas hardest or how soon summer heat usually arrives. Take along a few notes on what you want to grow and where, including how much sun the bed gets.

Checking this against your own garden

Your own observations outrank every date above. Three things are worth watching.

Soil warmth by feel. In spring, push your hand into the bed. Soil that feels cold and sticks in clumps will slow germination, while soil that crumbles and feels neutral or mild is ready. In fall, the same test tells you when summer heat has left the ground, which is when seed germinates well again. Beds that warm early are your sunny, south-facing spots.

First true leaves. A seedling’s first leaves are rounded seed leaves, and the first true leaves are the ones that look like the mature plant. When they appear, thin the row and spread plants apart. If they take longer than expected, the bed is running cold or shaded, which tells you to sow earlier next year.

Where frost shows up first. On the first frosty mornings, look at which corners of the yard have white grass and which stay green. Low spots and open ground hold frost longest, while spots near a wall or fence stay warmer. The warmer spots are where tender greens can last the longest into fall, and where hardy greens will keep growing through winter.

Common questions

Can Asian greens grow through a North Carolina winter?

Often yes. At the Charlotte reference station the coldest month has a mean daily minimum of 31.8°F, which suits hardy types such as tatsoi, mizuna, komatsuna and mustards. In the mountains, colder winters mean a row cover or low tunnel for protection. The heat-loving types will not survive any freeze.

What is the easiest Asian green for a first-time grower?

Mizuna and komatsuna are easy to start with. Both germinate readily, grow quickly in cool weather, take light frost and can be cut as baby leaves soon after sowing. Mustards are similar. They can be picked young and often regrow after cutting.

Can I grow bok choy in summer?

In the Piedmont and on the coast, it is a poor bet, since heat and long days cause quick bolting. In cooler mountain sites with some afternoon shade it has a better chance. For summer harvests across most of the state, grow amaranth or malabar spinach instead.

When should I plant napa cabbage?

Plant it as a fall crop. It needs a long cool stretch to form a tight head, which fall provides and spring rarely does. Time sowing so plants have good size before the October 30 to November 8 freeze band at the reference station, and check the sowing calendar for the timing by region.