The best Asian greens for Michigan are the quick, cool-season types: baby bok choy, tatsoi, mizuna, komatsuna and mustard greens, with napa cabbage as a fall crop. Heat-lovers like amaranth are a bonus in warm summers, not a foundation. Michigan rewards crops that finish before the cold returns. For the full growing guide, start with Growing Asian Greens in Michigan.
The short answer for Michigan
Choose by type, and let the length of the season make the call. Fast leafy greens are the safest bet, because they ask for cool weather and little time. Heading crops such as napa cabbage and full-size bok choy earn a place when you sow them for fall. Slow heat-lovers are the gamble.
The numbers behind that advice come from MSU Extension. The last spring frost falls around April 30 in the Detroit area, and early to mid May across most of the Lower Peninsula. The first fall frost arrives October 6 to October 21 in zone 6a. These are typical dates, not promises, and a given year can land on either side. In the 6a parts of the state that leaves roughly five months between frosts. Cool-season greens don’t need all of it. They do best in the shoulders, in spring and again in late summer through fall, and the middle of the window is when they struggle.
| Type | Examples | Fit in Michigan |
|---|---|---|
| Fast leafy greens | Mizuna, tatsoi, komatsuna, mustard greens, baby bok choy | Best choice. Reliable in spring and fall, and light frosts rarely trouble them. |
| Heading and larger crops | Napa cabbage, full-size bok choy, choy sum | Good for fall, when sown to finish before the first fall frost. |
| Heat-lovers | Amaranth, water spinach | Marginal. Only after the last frost, and best in the warmer southern Lower Peninsula. |
Winter is the other number worth knowing. Detroit’s mean daily minimum in its coldest month is 19.2°F (NOAA NCEI Climate Normals, 1991-2020). That is an average night, not the record low, and it tells you the open garden is a poor place to leave most Asian greens through January. Treat them as spring and fall crops. For dates on the calendar, see When to Sow Asian Greens in Michigan.
What will not work here
Water spinach set out in late April. Even in Detroit, where the last frost averages around April 30, a chilly night can still follow it, and across most of the Lower Peninsula the average runs into mid May. Heat-lovers sulk in cold soil and don’t recover quickly. If you want them at all, wait until the weather has settled and expect a short harvest.
Late-sown heading crops fail in a quieter way. A napa cabbage needs time to form a head, and the first fall frost lands between October 6 and October 21 in zone 6a, earlier in colder zones. Sow it in the middle of summer and it has a fair chance. Sow it much later and you get a loose, small plant when the cold arrives. Slow types have the least margin of any Asian green here.
Spring bok choy is a trap of its own. Michigan springs often jump from cool to warm quickly, and these plants respond to lengthening days and rising heat by bolting. A spring sowing that sits through a warm spell can send up flower stalks before you’ve harvested much. Fall sowings usually behave better because the days are shortening, not lengthening.
Overwintering in open ground is a gamble too. With nights averaging 19.2°F in the coldest month at the Detroit reference station, and colder further north, unprotected plants are a bet against the weather. A cold frame or low tunnel improves the odds, but it doesn’t make them certain.
Crowding is the quieter mistake. This page does not have humidity or rainfall figures for Michigan, so it can’t tell you how muggy your summer will be. But damp, still air between tightly spaced plants is where leaf diseases and slugs thrive, and a bed of mizuna thinned early stays healthier than one left thick. Flea beetles, which pepper brassica leaves with tiny holes in spring, are a common nuisance on mizuna and mustards. Light row cover is the usual fix.
North of the Lower Peninsula, this page lacks frost dates. The Upper Peninsula is not covered by the figures above, so don’t borrow Detroit’s.
What changes across Michigan
Michigan is not one garden. The USDA Plant Hardiness Zone Map (2023, based on 1991-2020 normals) places the state in zones 4a to 6b. That is six half-zone steps from the coldest northern interior to the mildest southern spots, so there is no single answer for the state. The map is built on one variable, the average annual extreme minimum temperature, so it describes winter cold rather than the length of your growing season.
Detroit is the reference city for the figures above, and the fall frost range of October 6 to October 21 is given for zone 6a. Other parts of the state differ, and the further you are from the southeast, the less these dates should be trusted as written.
If you garden in the north, or on higher and more exposed ground, shift your plan in three ways:
- Lean on the fastest greens, such as mizuna, tatsoi and baby bok choy, over heading types.
- Sow later in spring and earlier for fall, and use row cover or a cold frame at both ends.
- Treat heat-lovers as optional. Skip them if your summers are short.
Near the Great Lakes shorelines, the water often moderates temperatures and can delay the first fall frost. The effect fades inland, so a garden a few miles from the lake can behave quite differently. Your own zone is not something this page can tell you. Look up your location on the USDA Plant Hardiness Zone Map, which lets you search by ZIP code, and use that as a starting point.
Where to check this for your own county
Your state extension service is the next stop. MSU Extension runs county offices across Michigan, and they know how your area actually behaves, from lake effect to frost pockets.
Two things are worth looking for. The first is a local planting calendar, ideally one built on your county’s frost dates rather than the statewide ones. The second is the list of varieties trialled nearby. A variety that performed well in a trial garden in your county has already survived your soil, your weather and your pests, which no general list can promise.
Many county offices also have Master Gardener volunteers, who answer questions about what grows locally. If you call, ask which Asian greens people in your area grow successfully, and when they sow them.
A county recommendation beats a state one. This page is the state one. It gives you the types that suit Michigan’s season and the failures to avoid, and it can’t see the hill behind your house or the low corner where frost collects. Where the two disagree, trust the county office, and trust your own garden over both.
Checking this against your own garden
Your own observations outrank every date on this page. Three are worth watching, and none needs equipment.
Soil warmth by feel. Push a bare hand a few inches into the bed in spring. If it feels cold and damp, seeds will sit and sulk. If it feels like a mild day, sowing makes sense. A bed that warms earlier than a neighbor’s has a sunnier, better-drained microclimate.
The first true leaves. Seedlings first show rounded seed leaves, then true leaves that look like the mature plant. Note how many days that takes in your garden. Slow emergence tells you the soil is cooler than the calendar suggests. Fast emergence in a bed against a south wall tells you it’s a warm pocket.
Where frost shows first. On the first cold mornings of fall, walk the yard early. Frost on the lawn at one end and bare grass at the other shows you where the cold settles. Put your most tender plants in the spot that stays clear, and your hardiest in the frostiest corner.
Keep a few notes from one season to the next. After two or three years, they’re a better local calendar than any published one.
Common questions
Which Asian green is easiest for a first Michigan garden?
Mizuna and komatsuna are forgiving choices. Both grow quickly, handle cool weather and tolerate some mistakes in timing. Baby bok choy is a close third, though it bolts more readily in spring warmth.
Can I grow bok choy in both spring and fall?
Yes, but fall is usually the more dependable crop. Spring plantings can bolt as days lengthen and the weather warms. Sow for fall so plants mature in cooling weather, ahead of the first fall frost, which falls between October 6 and October 21 in zone 6a.
Is napa cabbage worth growing in Michigan?
For a fall crop, yes, if you sow it early enough that it can form a head before hard freezes. It is a slower plant than mizuna or tatsoi, so it needs more planning and has less room for error, especially in colder parts of the state.
Can Asian greens survive a Michigan winter outdoors?
Not reliably in open ground. The coldest-month mean daily minimum at the Detroit reference station is 19.2°F, and many places are colder. A cold frame or low tunnel gives hardy types like tatsoi and mizuna a chance, but even then results vary by site and by winter.