This is a primocane variety, featuring sweet, yellow-orange fruits suitable for both direct consumption and processing. The shrub is characterized by medium growth, producing several stems reaching a height of approximately 1.5 meters. The stems are light green and covered with numerous small thorns. The fruits are firm, medium-sized, round, and glossy. Depending on the harvest maturity phase, they range in color from light yellow to dark orange. They are delicious. They boast a high extract content (11.7% Brix), elevated vitamin C levels, and a strong antioxidant capacity (measured by DPPH and FRAP indicators). The polyphenol content is comparable to the 'Polana’ variety (Table 1). Jantar is primocane variety, mainly bearing fruit on the current year’s stems. Fruit ripening begins in the first week of August and typically lasts 3-4 weeks. The plants are healthy and exhibit low susceptibility to stem and root diseases. Table 1. Commercial yield, fruit mass, onset of ripening, and extract content (% Brix) of the Jantar variety compared to the 'Poranna Rosa’ variety.
Variety Commercial yield kg/plant Commercial yield g/shoot Average mass (g) Max. mass of fruit (g) Min. mass of fruit (g) Begining of ripning fruit Extract [% Brix ]
Poranna  Rosa 0,92 177,1 3,7 5,1 2,5 17.08  8,9
Jantar 0,94 200,2 2,8 4,1 2,3 8.08 11,7
  Table. 2 . Anthocyanins content, vitamin C, polyphenols and antioxidant values: DPPH and FRAP in fruit of raspberry varieties and clones from the breeding program of Niwa in Brzezna
Variety/clone Anthocyanins (cyanidin-3 glucoside mg/l) Vit.C (mg/100 g suchej masy) Poliphenole (g gallic acid na 100 g d.m) DPPH (mmoli trolox/100 s. m., SD w 15 min) FRAP (mmol Fe2+/100 g s. m.w 15 min)
JANTAR 2,4 187,8 0,89 52,46 2,27
PORANNA ROSA 0,2 204,0 0,89 47,38 2,34
(Research was done by PHD M. Krośniaka z UJ, Faculty of Pharmacy, Department of Bromatology, as part of ongoing projects by NCBiR: POIR.01.01-00-0073/16 i POIR.01.01.01-00-0005/17).