PB valley has total vineyard area of 500 hectares out of 2,500 hectares all together with 400 hectares being planted with wine grapes and 100 hectares of table grapes.   We have approximately 300 hectares of red grapes and 100 hectares of white grapes and the remaining 11 hectares are of mixed varieties. The grapes are grown using vertical shoot positioning trellising system(VSP) with 2 arms cordon training and drip line irrigation

General climate of the area is very suitable for grapes growing, beginning with light mist in the morning that will clear away by 8 o’clock which is different from northern part of the country like Chiangmai or Chiangrai where heavy fog is a major problem as it will clear away as late as 10 o’clock. This put grapevines into risky conditions as it is susceptible to diseases in long period of high humidity. The character of soil within the area, the Muaklek soil, is very fertile and high in minerals and nutrients for grapevines. It is a clay-loam type soil with mid acid pH value between 5.8-7.  The depth of top soil and sub soil layer is around 0.5-1.5 metres followed by a layer of broken down lime stone and gravelly clay. The drainage property of the soil itself is medium due to high clay content but as most of the vineyard areas are on hillside slope, rapid drainage of surface water prevents water logging in soil.

          Even though Thailand is a tropical country, temperature in the North Eastern part reaches sub 10 °C in winter but does not go below 0 °C or below like most cold climate countries.
Grapevines here are in production right through the year with no dormancy. Viticulture practice in Thailand is totally different from cold climate viticulture.. After harvesting each year in February, the plants will be in their resting stage where they will be fed with fertilizer occasionally together with calendar base spray programs. All the canes will be left on the plants until May which is the beginning of raining season then primary spur pruning will be carried out. Primary pruning stage here is considered as an autumn stage in cold climate country as all canes will be cut back together with all leaf. Budburst will occur several days after pruning and the plant will be at cane training stage where all flowers are removed during varaison and this treated as dormancy period in cold climate area.  The canes will be left on the plants with their leaf, the purpose is to let the plants saving up nutrients and carbohydrate and be ready for second budburst. Secondary spur pruning will be done in September which is the end of raining season, all the cane will be cut back and secondary budburst occurs several days after this. This is the productive stage and considered as spring stage for grapevine in cold climate area following by varaison(flowering) period. This time all flowers will not be touched until the fruits set. Grapevines will be well looked after until harvesting again in February.