How to grow “Cosiabra” taught by the farmer “Queen of Wild Vegetables” is increasingly popular

What is Cosiabra?

Although it has become more popular in urban areas in recent years, it is very rare that you want to develop a cosia bra. I think he’s a very curious person.
Although it is difficult to say that it is generally recognized, cosiabra is classified as “genus Ukogi of the family Ukogi”, and it is found in primeval forests throughout Japan, except for Okinawa, where the Artificial forests like sugi are not planted. It is a naturally growing plant. In addition to being used for wood, the young shoots are also used for food.
Even with the same wild vegetables, the taranome is becoming more and more popular and easier to find at supermarkets, but arguably, there is still little chance of seeing cosia bras.
Most of the products currently on the market are those that have been shipped by harvesting the young shoots to their own dough, so there is little specific farming techniques available, and the current situation is research. The rescue has not made much progress. Was.
Cultivars are not born like vegetables and fruit trees, but it is one of the few plants of Japanese origin that are still eaten, and cultivation is not particularly difficult.

How to plant a cosia bra?

If you decide to plant a cosia bra, you will have a big problem in the initial “seedling” step. In addition, some may want to grow a cosia bras that are native to the mountains.

Notes when planting seedlings purchased

The most common question about a cosia bras is that the seedling dies without rooting in the first place. It is very difficult to buy at home centers so I usually buy online and conclude that the goods are poor, but it can also be due to the following reasons.
Kosiabra’s roots have a smooth surface. As a result, the soil in the root pot tends to be crumbled during planting, but when that is done, the fine roots may break off. Although the roots are as thin as hairs, it is not an exaggeration to say that the thick root is the most important part of the roots and only the foundation that supports the good roots.
If you lose many of these fragile roots, it will adversely affect the future growth, so even healthy plants should be planted carefully.
When I searched “Cosiabra seedling” on the Internet, I found that only the roots were for sale. If you want to buy branch roots and plant them from the base, see the next section.

Root propagation method

Although it is sometimes recommended to grow seedlings from seeds sown or planted using techniques such as picking and cutting, I do not recommend such methods in home gardens because of the low success rate.
Here, we will introduce a method called “pruning” that has good rooting and good growth in the early stages.

* Be sure to ask the landlord’s permission when collecting cosia bras. In addition, the collection is prohibited in national parks.

If you went into the mountains around March and looked at the roots of the Kosiabra tree you were looking for, you can see a sapling called “Hikobae” growing from the ground. Depending on your nutritional status, some may not grow, but you may easily find a large tree.
Carefully dig the base of the shoots, separate the stem from the parent’s root and dig up. The more sapling roots are dug up, the better the initial growth is.
If you take it home and soak it in the water, it will begin to sprout (spread the leaves) about 2 to 3 weeks, so plant it after that.

Even if you can’t find the hikobae, you can plant it by just cutting the roots from the ground and digging it up.
Cut a stem 1 cm in diameter or more and take home about 10 cm in length. In this case, it is easy to choose saplings (third year plants) as possible, and they do well.
The take-back roots are buried in Kanuma, Akatama, mountain soil, … with a depth of about 2 to 5 cm and between the roots is 15 cm and covered with newspaper, straw, fallen leaves, etc. In order to prevent the plant from drying out, from 1 to 2 months the plant will take root and see the germination, the seedling is ready.

For spring-produced seedlings, try to plant seedlings in the same year and plant in December to February after the leaves have fallen.
You can choose anywhere. It’s sunny, but it grows well even in half shade.

What fertilizer and harvesting method do you need for Cosiabra?


As a plant that grows in natural mountainous regions with the same climate as Japan, if planted in the ground, it does not pay much attention to fertilization.
The strict fertilizer design has yet to be analyzed, so the existing metrics (as of October 2018) are based on experience and speculation only. According to deciduous trees in general, if applying organic fertilizer with 8% nitrogen as the main fertilizer around December, 500 grams of fertilizer per tree is sufficient. It is equivalent to about 1 kg of oil residue.


Harvesting is easy and can be easily picked with bare hands. From April to mid-May, young shoots are picked at the same time as the Takenoko (Mensotake) season. In particular, the top bud (choga: the bud at the tip of the branch) is said to be rich in flavor and delicious. It is a balanced yield to increase next year’s shoots by just picking and eating the top buds so you don’t lose too many buds and the buds will disappear next year.

Garden instructor Tsuru-chan’s bite memo

Plants have a habit of “shoot dominance”, and in many cases, nutrients and sugars are concentrated and sent to the tips.
In particular, the tip of the ingredients (like Takenoko and Renkon) makes you feel harsh when eaten raw (corresponding to Season 1 in Renkon) soft, sweet and nutritious, so remove the top before someone else eats . Get rid of it!

Cosiabra pruning method

Cosiabra is a plant that can reach a height of 10 meters when planted without harvesting or pruning.
However, because the shoots are mainly harvested, so if they are taken care of, it will be difficult to grow to that extent even without taking care.
It is sometimes pruned to prevent it from becoming too tall, but pruning can increase the number of branches. Increasing the number of branches will lead to an increase in the number of shoots, so it is necessary to be proactive in pruning.
If you cut back about 1/5 of the total length of the branch around the end of May at the end of the harvest, the nutrients should have gone to the shoot, where the most concentrated nutrients would be dispersed, and you will be able to secure more branches.

Although I have written many things, Kosiabra is a very strong plant and an easy plant to grow, requiring virtually no pesticides to control pests. It is fun to grow wild vegetables that adorn spring colors with your own hands.

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