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Chinese/Napa Cabbage and Oriental Leaves

Chinese or napa cabbage – Brassica rapa, Pekinensis Group

Pak choi/bok choi – Brassica rapa, Chinensis Group

(and other Latin names – see below)

This lesson is titled Chinese cabbage because it takes up more than half of the content – it is a fast and exciting vegetable to grow. I give information on other vegetables from Asia because they are closely related and you can grow them in similar ways.

All are part of the wonderful and enormous species of Brassica rapa vegetables from China, Japan, Korea and many Asian countries.

Chinese cabbage is called napa cabbage in North America. It is uncertain whether this word comes from the Napa Valley, where it was first grown commercially, or from the Japanese word β€˜nappa’, which means leafy vegetable.

  • The heavy and fast-growing heads of Chinese cabbage result from centuries of breeding in China (especially in the Beijing region) between turnips and pak choi, of which bok choy is the equivalent American term.
  • The choi/choy vegetables of Chinensis Group vegetables do not make heads. Their growth of new leaves is strong in cool winter months, the best time to grow them. This is true for mustards and rocket too, with the one exception of wild or perennial wall rocket – see below.
Hearts of winter cabbages in late October – here we have Tundra, Chinese, Granat red and Paresa Savoy cabbage
Slug and caterpillar damage to Chinese cabbage in early November
26th February – comparing the speed of winter growth outdoors, between Samish F1 spinach on the left and Yuushou F1 pak choi on the right

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Nomenclature

There is a minefield of colloquial words used. I am aware that my audience is from many countries, where the descriptive terms vary.

This lesson uses a range of names in English and Latin, but cannot be comprehensive, otherwise there would be more descriptive terms than descriptions! The photos can give you clues to my descriptions if you are unsure.

Harvest period

  • Days from seed to first harvest: Pekinensis heads 70–80, Chinensis leaves 30–40 (similar for most Oriental leaves).

Seeds sownReady to harvestPekinensis late summerHeads mostly in late autumnChinensis and Oriental late summerLeaves mid-autumn, through winter if temperateChinensis and Oriental late winter under coverEarly spring but only briefly

  • Best climate for these covers many possibilities, from temperate to continental, but with no excessive heat or continual cold.

Why grow them

Chinese cabbage makes heads far faster than ordinary cabbage. They make it possible to have a considerable amount of cabbage leaves in autumn, from one sowing right at the end of summer. This enables productive use of ground in the autumn, which might otherwise be empty after a preceding harvest of beans, onions or beetroot, even early summer squash.

Likewise, the leaves of pak choi and tatsoi come to harvest fast. As with Chinese cabbage, they are highly susceptible to damage from many insects.

From one sowing you can harvest many times, and they are useful as catch crops in the autumn or even in early spring, though only briefly, before insects arrive and flowering initiates.

The heads of Chinese cabbage make super sauerkraut, and the leaves of all other vegetables here contribute strong and varied flavours and textures, to both cooked and salad dishes. They bring a valuable amount of chlorophyll to winter cuisine when other greens are scarce.

In this late October harvest, the Wong Bok variety is very long!
An outdoor harvest of Oriental leaves in late August – left Joi Choi, right Komatsuna, top Red Choi and bottom Mibuna; all transplanted four weeks earlier
Mid-March – Chinese cabbage have been picked for leaves through the winter in the polytunnel; they were sown in September

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Pattern of growth

Spring flowering means that spring sowing is considerably less productive for leaves than sowing in late summer and early autumn.

Chinese cabbage is the only one of these vegetables to make firm heads. Pak choi makes a tight cluster of leaves, which are often harvested as a loose head, all together.

  • These all grow faster than perhaps any other vegetables. If you enjoy spicy flavours and want salad and cooking leaves in autumn, even through to winter, these are for you.

Types and varieties

Just a few examples from the hundreds available.

Chinese Cabbage

Yuki F1, Blues F1 and Sativa are barrel-shaped and firm. Sativa is slightly longer, matures a little later and stores well.

Wong Bok variety is one of many barrel types that grow very long and are less suitable for long-term storage.

Michihili is a type with pointed leaves in medium-sized heads, shaped like cos/romaine lettuce. Leaves are tender and sweet.

There are a few red varieties, mostly hybrids. The colour is rich and varied but heads are not heavy.

6th October – this Sarvita F1 Chinese red cabbage doesn’t make a firm head but the colour is amazing
9th October – a few days later, a Blues F1 Chinese cabbage shown under mesh, after the outer leaves have been removed

Oriental leaves, including Pekinensis, Juncea and the rockets

Mustard leaves/Oriental mustard (Brassica juncea)

Originated in the Himalayan foothills. Mustards are a large family, with many cultivated varieties of pungent mustards and the less spicy mizuna and mibuna. A spectrum of red and green colour variations occur, and the speed of growth is remarkable.

15th October – Wasabyna mustard after three picks; these were transplanted 46 days earlier
16th March – red giant mustard overwintered outside
Early December – mostly mustards in a mushroom box filled with multipurpose compost, from a mid-October sowing in the unheated greenhouse

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Pak choi

Varieties are available in huge number. My favourite is the hybrid Joi Choi for its large white stems and vigour of growth. Tatsoi is a lower growing type of pak choi, forming beautiful rosettes of leaves, and Yukina Savoy is probably the most vigorous and upright.

Pak choi Baraku F1 on 31st August – it could be cut as a head or picked of outer leaves
These pak choi were transplanted on 9th September and are now being kept safe under mesh against insects; they were sown on 18th August and pricked out to modules under cover
A light autumn frost on the same pak choi, two months later; the frost is fine, as it’s not lower than -2 Β°C/28 Β°F

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Salad rocket/arugula (Eruca versicaria, Sativa Group)

Native to the Mediterranean region. In temperate climates it crops most prolifically outdoors in autumn and under cover in winter, from sowings in late summer and until the autumn equinox – see the photos below and in the β€˜Interplant’ section.

Wild rocket/perennial wall rocket/wild arugula (Diplotaxis tenuifolia)

Grows wild in the Mediterranean region. It crops most prolifically through spring to early summer, from sowings in early autumn. To enjoy pungent rocket flavour over a long period, you can combine the spring cropping of wild rocket with the autumn and winter cropping of salad rocket.

Salad rocket on 12th October – this has been under a fine mesh since being transplanted 60 days earlier, and has been picked for the past four weeks
As good as it gets with flea beetle! 12th June – overwintered wild rocket, with almost no damage at all thanks to ultra-fine mesh
Salad rocket in early May, when flea beetle holes are typical – this was covered by fleece with a few holes

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Suitable for containers/shade?

All of these tolerate shade and are worth growing in containers. You can harvest leaves all through late autumn and then through winter if you have a space under cover – see the photos for ideas.

9th November in the greenhouse – we have a box of potting compost with endives, pak choi, including red pak choi, mustards and spinach, sown in September
In March, at the end of winter, this Chinese cabbage is flowering and the Red Frills mustard will soon bloom too; these were overwintered indoors in boxes of compost
Salad leaves are surviving the -8 Β°C/18 Β°F chills outside; it’s also freezing undercover but less so, and with no precipitation or wind

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sow & propagate
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These are brassica seeds that germinate fast. You are sowing them almost exclusively in the summer, so propagation is incredibly rapid. Sometimes seedlings can be ready to transplant within two weeks.

  • Seeds germinate in three days with fully developed cotyledons in five days.

Sowing conditions

Seedlings are susceptible to flea beetle and caterpillar pests, and often slugs as well, so I recommend sowing only under cover. You don’t need too much space because of their speed of growth.

Sowing time

It’s best to wait until after the flowering season has finished before sowing. Therefore after midsummer, and preferably late summer is a good time to sow.

Best results at Homeacres for Oriental leaves are from sowings in early August; for under cover salads, we sow in mid-September.

Chinese cabbage for heads need sufficient time to grow into a head of good size, but also its best not to sow too early, otherwise insects do extra damage. There are two further reasons for not sowing too early:

  • It will allow more time for preceding vegetables to finish cropping.
  • Your harvest of heads will be ready closer to winter, at a time when they are probably more valuable because summer vegetables have finished.

Sowing method

For heads of Chinese cabbage and large stems of pak choi, you want one plant per module to make heads of a good size. It works well to scatter seeds in a small tray and then prick out before they are five days old. Or sow two seeds per module and thin to one.

Most Oriental leaves grow nicely in clumps of two or three. Sow three or four seeds per module, then thin to the number of plants you want in each module.

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TRANSPLANT - SIZE, TIME OF YEAR, SPACING, SUPPORT
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The rapid growth of these seedlings means they are better transplanted as soon as possible. In late summer the soil is warm, and there is no need to pot on.

Transplant size

Small and young is good. The photos above show how Chinese cabbage is ready for transplanting after only two weeks.

The first time I transplanted such small seedlings, I wondered how it might work. Every late summer the results are always so strong that it’s become my standard practice.

When transplanting in cooler conditions, from mid-autumn, seedlings settle in better when three to four weeks old at transplanting – see these photos from October.

Transplant method

Using a long-handled dibber is quick for making holes, partly because these small seedlings are growing in small modules, so the holes are really quite tiny.

You are transplanting mostly in dry summer weather, so make holes a little on the deep side and water carefully after planting. Modules set deeper will hold moisture for longer.

Interplant

Chinese cabbage grows large so quickly that interplanting between anything else is not viable. Also, when it comes to the end of its life, time has run out for other interplants to go in between.

Oriental leaves on the other hand, and salad rocket, work well as interplants between other vegetables that are soon to finish, such as summer salads, ridge cucumber (cut off mildewed leaves first to make space), carrots and cordon tomatoes.

Spacing

For heads of Chinese cabbage: 30 –33 cm/12–13 in.

For Oriental vegetables to harvest leaves: 22 cm/9 in works for leaves over several months, or one cut of a head of pak choi.

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WATER
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These are fast-growing plants and need plenty of moisture. Unless there is steady summer rain, you need to water regularly. In hot dry weather, I would aim for every second day, and a decent amount.

On a positive note, these brassica plants thrive in moist weather and suffer few leaf diseases, so when it rains you can relax in the knowledge that they are growing well. If the rain total is only small, on days of drizzle for example, it’s worth continuing with watering, especially for containers.

Extra mulch to retain moisture?

I suggest using only compost as mulch around Chinese cabbage and pak choi, because of the very high risk of slug damage resulting from undecomposed mulches. Slugs like these two vegetables more than any other.

Oriental leaves are at a close spacing, such that they provide leaf cover as mulch.

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feed
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CONTAINER GROWING
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PRUNE AND TRAIN PLANTS/THIN FRUIT
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HARVEST TIMES AND METHOD
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How to judge readiness

For cabbage heads, it depends how firm you like them to be. Cut one in mid-autumn to see what it’s like inside.

  • There is a reasonably long period of time in which to cut heads, from 70 to over 100 days from sowing.
  • Heads of pak choi are ready within 40 days from sowing, and for perhaps a month after that. The longer you leave them, the more insects and other damage there will be on outer leaves.
  • Oriental leaves and rocket are ready any time you want to eat them, as long as leaves are large enough to pick off. We allow plants to grow for 15–20 days after transplanting, before a first pick.

How to pick

You need a sharp knife to cut heads of Chinese cabbage and pak choi because of the strong fibres in the stems.

You can also use a knife to cut off outer leaves of pak choi and other Oriental leaf plants. Or, if your thumbnail is long enough, you can use it as a quick way to cut through stalks of larger leaves, such as mustards and rocket.

How often to pick

Even in autumn, growth can be fast, so you may be picking leaves every few days.

For heads of cabbage, it depends how many you planted – they come ready at a range of times from the same sowing, so watch your plants for readiness.

Insect damage to heads is a warning sign that they are better picked today or soon, especially if you see holes made by caterpillars going right inside – see below.

Storing

Heads of Chinese cabbage store well, as long as there is no insect damage. Aim for the harvest to be in late autumn, when the weather is cooler.

Best temperature for storing is below 10 Β°C/50 Β°F, simply in a box in a damp shed for example. I find that heads keep in good condition for a month or more. There are always a few wilting outer leaves to peel off before use.

Pak choi and Oriental leaves store less well, because they are mostly water and lose moisture rapidly from a high surface area. Even in a polythene bag, they also tend to go yellow after five days unless really cool – just above freezing point.

Saving seed

Seeding brassicas take up a lot of space in their second spring, as long as they survived winter. Best save seeds of only one variety at a time, which reduces your options.

I don’t want to discourage you but, for the cost of a few seeds, which store well, saving these seeds is perhaps not worth it.

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POTENTIAL PROBLEMS
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Which pests are likely, and when

  • Slugs are the big pest for Chinese cabbage and pak choi. Every year I find that most vegetables are slug-free, or at least damaged only on older leaves which doesn’t matter. And yet, at the same time, often adjacent to these vegetables and growing in the same conditions with the same amount of moisture, there are many holes in younger leaves of Chinese cabbage and pak choi. I am unsure exactly why this is, I can only think that it relates to climatic differences between here and the regions of China and Asia where these vegetables originated, such that they are not quite at home in Somerset and weaker, therefore attractive to molluscs and pests generally. Or perhaps it’s their sheer speed of growth, making leaves soft and easy for pests to eat.
  • Flea beetles damage seedlings, but not too much.
  • Rabbits eat brassica seedlings, perhaps leaving only a stem.
  • Caterpillars can decimate plants of Chinese cabbage, and do horrible damage to otherwise lovely heads. The main damage to Oriental leaves is by green caterpillars of cabbage moths.
  • All the photos in the gallery below were taken on the same day in late October 2012, after a wet summer.

Protections needed

Mesh is the most effective preventive. Best use hoops to support it, and put in place straight after the transplant. Keep over plants for most of their lives, at least until mid-autumn when you see no more butterflies. The difficulty is with moths, which one rarely sees – the result of a moth caterpillar is shown in the middle photo above.

Bacillus thuringiensis is good against caterpillars only. Spray seedlings before transplanting, then ideally about five times every 16 days until mid-autumn.

Other likely difficulties

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There are a few plants that succumb to the rotting of outer leaves, and occasionally the main stem too – plants may then shrivel. I do not advise any remedy, because this happens most autumns and only after there have already been a lot of harvests. It’s an isolated occurrence rather than a general die-off.

  • All the covers in the world are not a guarantee of success. These are difficult vegetables from that point of view, a challenge, but are so worth attempting for their speed of growth at a great time of year.

If your soil has clubroot, best read this:

Clubroot is relatively rare. Spores are most active in warm soil, therefore there is less damage to winter brassicas, but Chinese cabbage and Oriental leaves grow in warm autumn soil.

The result of clubroot infection is galls or swellings on roots and lower stems. These impede the uptake of nutrients and water.

It is spread in many ways: by the import of infected plants, from infected neighbouring plants, by use of infected tools, by moving infected soil and even from surface water runoff. Spores remain dormant for several years, until coming to life again on host plants.

  • I am not aware of resistant varieties of Pekinensis and Chinensis.
  • Clubroot thrives in slightly acid and wet soils. As with allium white rot, no dig reduces incidence. Perhaps also give a dusting of lime in spring every year, to lessen the damage.


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Clear

Normally one is clearing these plants, or any remains of them, in late autumn, with no time for new plantings afterwards. Use a sharp knife or trowel to cut stems at soil level, or simply twist out any residue.

Then spread some compost as cover in winter, food for soil organisms, and for plants through the coming year.

Follow with

In terms of timing, you have the whole of a year to enjoy growing whatever you like. Rotation theory says not to grow brassicas, but I don’t see this as a rule, rather a guideline.

I prefer to grow vegetables of a different family after brassicas, but sometimes, and especially for those growing a lot of brassicas, you grow them consecutively.