Detailed Explanation of Key Techniques for High-Yield Cultivation and Management of Gastrodia elata

Gastrodia elata, also known as red arrow and ming tian ma, belongs to the orchid family (Orchidaceae), tribe Gastrodieae, subtribe Gastrodiinae, and is a perennial herbaceous parasitic plant. Due to extensive and rough planting and management techniques for Gastrodia elata, the phenomenon of "relying on heaven for harvest" is relatively common, so true high and abundant yields have not been achieved. The key techniques for high-yield cultivation explored and trial-planted by the author in recent years are summarized as follows:

I. Suitable growing environment for Gastrodia elata

(1) Altitude

Gastrodia elata is distributed in more than a dozen provinces and cities in China, and can generally be planted in areas at altitudes of 300-1900 m. The most suitable altitude is 600-1200 m. In a broad sense, as long as its temperature and humidity can be controlled artificially, it can be planted in both the south and the north, in mountains or on plains.

(2) Temperature

Temperature has a relatively large effect on the growth of Gastrodia elata. When the ground temperature reaches 10°C-12°C, Gastrodia elata begins to sprout and grow; when the ground temperature reaches above 15°C, growth gradually becomes vigorous; at 20°C-25°C, it is in the vigorous growth period; when the ground temperature exceeds 30°C, Gastrodia elata almost stops growing, and during the winter dormant period the ground temperature should be controlled at 2°C-5°C. In most areas of the country, through artificial measures, it can generally be planted.

(3) Humidity

The humidity during the growth period of Gastrodia elata generally requires a soil moisture content of 50%-80%. According to experience, the planted soil when dug out should "form a ball when squeezed by hand and scatter when the hand is released." Such a moisture content is generally about 60%, which is just suitable for the growth of Gastrodia elata. If the moisture content is too high, it is easy to cause rot of Gastrodia elata or excessive growth of Armillaria mellea invading Gastrodia elata, forming a reverse digestion phenomenon, so the growth of Gastrodia elata "prefers drought over waterlogging."

(4) Soil

Gastrodia elata is suitable for growing in slightly acidic sandy loam rich in humus, with a pH value between 5 and 6.5. If conditions permit, black humus soil from forests or river sand, yellow sand, or weathered limestone sand the size of mung beans can be selected; next is sandy soil; clay soil must not be used.

(5) Terrain

In mountainous areas, Gastrodia elata is suitable for growing on semi-shaded and semi-sunny slopes of 5-10 degrees; in hilly areas, it is suitable for planting on north slopes. Through measures such as artificially building shade sheds, it can be planted regardless of whether it is mountainous land or flat land.

II. Selection of planting site: Because the growth of Gastrodia elata hardly requires sunlight, all idle lands with certain ventilation conditions, such as indoors, outdoors, basements, cave dwellings, air-raid shelters, mountain caves, roadsides, slope edges, courtyard edges, woodlands, and bamboo groves, can be used for planting. Places not suitable for planting Gastrodia elata include (1) clay land (2) saline-alkali land (3) waterlogged land (4) vegetable plots (5) places with miscellaneous fungi and highly fertile land.

III. Planting season and development pattern of Gastrodia elata: Gastrodia elata planting is divided into two methods: sexual reproduction and asexual reproduction.

(1) Sexual reproduction: This uses hybrid true seeds from artificial pollination of Gastrodia elata for propagation. The specifications of the planting hole are 50 cm long, 50 cm wide, and 40 cm deep. Sowing is from late April to late June each year. After a growth period of 5-6 months, when the nest is turned over at the end of November of the same year or in March of the following year, the first-generation seed tubers (mi ma) can be produced. With proper planting, each hole can produce more than 1 kg of seed tubers. After turning over the nest, each hole can be divided into 4-6 holes, and the first asexual reproduction can then be carried out.

(2) Asexual reproduction: This uses the underground tubers of Gastrodia elata for direct propagation. Planting can be done from late November each year to late March of the following year. After a growth period of 7-8 months, it is harvested at the end of the year. For holes of the same specifications, each hole can produce more than 4 kg of fresh tubers. Among them, 30%-40% of the arrow tubers can be sold as commercial tubers, and the remaining white-headed tubers and mi ma can be used as seed tubers for another 1-2 rounds of asexual reproduction. After three generations, because the seeds degenerate, continued planting is not recommended, and a new generation of seed tubers should be replaced in time to ensure high and abundant yields.

It can thus be seen that the key to high-yield cultivation techniques for Gastrodia elata can be summarized in the eight-character principle: good seeds, excellent fungi, coolness, and moisture. The artificial cultivation of Gastrodia elata has good economic benefits and features small investment, high yield, short cycle, quick results, small land occupation, no waste of forest resources, and easy management. Its input-output ratio reaches more than 1:3. As long as the three major links are grasped - good seeds and excellent fungi as the foundation, planting techniques as the key, and management measures as the guarantee - the necessary conditions for high and abundant yields in artificial cultivation of Gastrodia elata will be created, and good economic benefits will certainly be achieved.