[Latin Name] Polygonum Cuspidatum Sieb. et Zucc

[Plant Source] China

[Specifications] Resveratrol 50%, 95%, 98% by HPLC

[Appearance]Brown or white fine powder

[Plant Part Used] Rhizome&Root

[Particle size] 80 Mesh

[Loss on drying] ≤5.0%

[Heavy Metal] ≤10PPM

[Storage] Store in cool & dry area, keep away from the direct light and heat.

[Package] Packed in paper-drums and two plastic-bags inside.

[General feature]

1.100% natural source. Our resveratrol is 100% extracted from natural herb, very safe and more bioactive, which is rich with both CIS-resveratrol and trans-resveratrol.

2.Our resveratrol almost have no unpleasant taste compare to other resveratrols and it can be easier to take by oral.

3.We offer resveratrol at a very competitive price with superb quality.

4.We have a very large output and could manufacturer as customer particular requirement.

[Function]

Resveratrol is an active component extracted from Huzhang (Polygonum cuspidatum) in China.

It is an antioxidant phenol and a potent vasodilator that inhibits serum triglyceride synthesis, lipid peroxidation, and platelet aggregation.

It is extensively used for treatment of blood vessel disease such as atherosclerosis and hyperlipidemia. In addition, it has anti-virus and anti inflammatory activity, can treat acute microbial infections and viral hepatitis.

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How to Grow STEVIA Rebaudiana Bertoni Plant
How to Grow STEVIA Plant food
Growing Your Own Stevia
(Excerpted from Stevia Rebaudiana: Nature’s Sweet Secret, Vital Health Publishing)
If you enjoy gardening, Stevia can be a rewarding herb to grow. While it’s not feasible for most of us to grow sugarcane or sorghum in our backyard, several Stevia plants will fit nicely into a small garden. Recipes utilizing Green Stevia Powder are now available, and the whole leaves add to the flavor of herbal teas.
Stevia rebaudiana is a tender perennial, native to semi-humid subtropical regions of Paraguay and Brazil. Wild plants occur on acid soils that are constantly moist, but not inundated, often near the edge of marshes or streams where the soil is sandy (Brandle et al., 1998). In the garden, too, Stevia doesn’t like to dry out, but standing water will encourage rot and disease. Stevia can be a successful garden plant in most climates with the use of a few simple techniques. Raised beds or hills prevent “wet feet,” while an organic mulch and frequent watering ensure a constant supply of moisture.
In North America, Stevia survives winters only in the warmest areas such as southern California, Florida, and Mexico. Research in Japan indicates a critical winter soil temperature of 32 F to 35 F (Sumida, 1980). Stevia is a weak perennial, so plants grown as perennials should be replaced every few years. In colder areas, Stevia is planted after the last frost and treated as an annual. Longer summer days found at higher latitudes favor leaf yield and Stevioside content (Shock, 1982).
Soil Preparation
While tolerant of most soil types, Stevia prefers a sandy loam or loam. Any well-drained soil that produces a good crop of vegetables should work fine. Incorporating organic matter is the best way to improve heavy, high clay soils. A rich compost made with leaves, grass, hay, kitchen waste, manure, and other organic residues will improve soil structure and supply nutrients. Finished compost may be tilled, disked, or spaded into the soil before planting or used as a mulch later on. A “green manure” crop the previous year such as oats, rye, or legumes will also improve heavy soils. Stevia occurs naturally on soils of pH 4 to 5, but thrives with soil pH as high as 7.5. However, Stevia does not tolerate saline soils
Como crescer Stevia rebaudiana Bertoni Planta
 Qualquer solo bem drenado, que produz uma boa colheita de legumes deve funcionar bem. Incorporando a matéria orgânica é a melhor maneira de melhorar pesados, solos de alta de argila. Um composto rico feito com folhas, grama, feno, restos de cozinha, esterco e outros resíduos orgânicos vai melhorar estrutura e fornecimento de nutrientes do solo. Composto final pode ser lavrada, disked ou spaded no solo antes de plantar ou usado como uma cobertura mais tarde. A “adubo verde” cortar ao ano anterior, como aveia, centeio, ou leguminosas também irá melhorar solos pesados. Stevia ocorre naturalmente em solos de pH de 4 a 5, mas vive com o pH do solo tão alto quanto 7,5. No entanto, Stevia não tolera solos salinos . Fosfato de rocha, farinha de ossos, e greensand oferecer uma ampla gama de minerais. Para a máxima disponibilidade de nutrientes, trabalhar adubos orgânicos no solo, alguns meses antes do plantio, ou misturar com adubo.
Come coltivare Stevia rebaudiana Bertoni piante
 Qualsiasi terreno ben drenato che produce un buon raccolto di ortaggi dovrebbe funzionare bene. Incorporando la materia organica è il modo migliore per migliorare pesanti, terreni argillosi alti. Un ricco compost fatto con foglie, erba, fieno, scarti di cucina, letame, ed altri residui organici migliorerà la struttura del suolo e la fornitura di sostanze nutritive. Compost finito può essere coltivato, disked, o vangato nel terreno prima di piantare o utilizzata come pacciamatura in seguito. A “sovescio” ritagliare l’anno precedente, come l’avena, segale, o legumi migliorerà anche terreni pesanti. Stevia verifica naturalmente su suoli di pH da 4 a 5, ma cresce con terreno pH alto come 7.5. Tuttavia, Stevia non tollera suoli salini.
Mentre un buon compost di solito soddisfa i requisiti nutrizionali, i sintomi di test suolo o vegetali possono avvisare l’utente di carenze. Mark Langan di Mulberry Creek Herbfarm raccomanda basso azoto o fertilizzanti organici. Eccesso di azoto favorisce la crescita rango di sapore poveri. Farina di ossa, farina di sangue, farina di semi di cotone, guano, o letame essiccato fornire azoto che viene rilasciato lentamente. Fosfato o farina di ossa forniscono fosforo. Greensand è una buona fonte di potassio. Fosfato, farina di ossa, e sabbia verde offrono una vasta gamma di tracce di minerali. Per la massima disponibilità di nutrienti, lavorare fertilizzanti organici nel suolo un paio di mesi prima di piantare, o mescolare con compost

Stevia grows best in upland areas in sub-tropical climate. In other places it can be grown as an annual. The plant prefers a lightly textured, well-drained soil to which organic matter has been added. It needs ample water so that the soil is consistently moist, but not wet. In hot, sunny climates it will do best in semi-shade. Propagation is from seed sown in spring, but germination rates can be low-expect half the seeds sown not to germinate. Plant seedlings out once all danger of frost is over. Leaves are best harvested just before flowering. The plants will also grow from cuttings,which are best taken in late winter.The concentration of stevioside in the leaves of Stevia increasing when the plants are grown under long day condition.While, cultivating stevia on a large scale, it can be grown in well-drained red soil and sandy loam soil. The soil should be in the pH range of 6.5-7.5. Saline soils should be avoided to cultivate this plant.

Stevia can be successfully cultivated all around the year all over India expect theareas, which receive snowfall, or temperatures go below 5 degree Celsius in winter.The summer temperatures actually do not affect this plant if the high summer temperatures have already been factored in the cultivation practices.Since seed germination rate is very poor,it is propagated vegetative. Though stem cuttings are used for vegetative tissue culture plants have proven to be the best planting material for Stevia. Tissue culture plants of Stevia are genetically pure, free from pathogens and haveexcellent vigor. The tissue culture plants can be planted throughout the year,expect during peak summer. An ideal planting density is 40,000 plants per acre with spacing of 25×40 cm in a raised bed system. The soil can be enriched with abasal dressing of 25 tons of well rotten farmyard manure/hectare

Soil Type
Stevia requires very good drainage any soil that retain the moisture for very long period of time are unsuitable for Stevia cultivation and should be religiously avoided.Red soil and sandy loam with a 6-7 pH are best for the cultivation of Stevia.

Raised bed preparation
Forming raised beds is the most economical way to grow Stevia. The raised bed should be of 15 cm in height and 60 cm in width. The distance between each plant 23 cm. This would give a plant population of around 40,000 per acre.

Planting Material
There are basically two options for multiplication. The first is the tissue culture and second the stem cutting. Tissue culture is the best option but many farmers are tempted to try the stem cutting method for multiplication. As per practical experience, stem cutting is sometimes more expensive to produce than the tissue culture since the success rate of the stem cuttings establishment is very low, it takes minimum of 25 weeks for the stem cutting to develop in proper feeding roots for transplantation (younger stem cuttings transplants have shown more than 50% mortality in first few weeks of transplants in main field).

Harvesting
Another important aspect of harvesting is the timing of harvest. It should be noted that at no point of time plants should be allowed to flower since after flowering the Stevioside percentage goes down rapidly and leaves are rendered unmarketable. Leaves are harvested by plucking in a small quantity, or the entire plant with the side branches is cut leaving 10 to 15 cm from the base.The first harvesting can be done four to five months after planting. Subsequent harvesting can be done every three months, for five consecutive years. The sweetener in the leaf is maximum till the plant flowers. Just before flowering, the plant should be cut completely leaving 10 cm from the ground. The new flush of leaves will sprout from here. The new plant will be ready for harvest again in three months. The plant yields around 3000 kg of dried leaves from an acre of plantation every year. Harvesting should be done as late as possible, since cool autumn temperatures and shorter days tend to intensify the sweetness of the plants as they evolve into a reproductive state.

Unlocking the sweetness in your harvest
Once all leaves have been harvested it’s required to dry them. This can be
accomplished on a net. The drying process is not one that requires excessive heat;more important is good air circulation. On a moderately warm fall day, stevia crop can be quick dried in the full sun in about 12 hours. (Drying times longer than that will lower the stevioside content of the final product.)
Crushing the dried leaves is the final step in releasing stevia’s sweetening power. The
dried leaves are powdered, sieved and the fine powder is stored in containers. This can be done either by hand or, for greater effect, in a coffee grinder or in a special blender for herbs.

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