Rubus subgenus Rubus Watson 'Hull Thornless'
Originated from a cross of Thornfree x Darrow
Plants are thornless
Bushes have semi-erect canes
Fruit weight is 7 g
Berries have a conical shape
Fruiting habit - floricane fruiting (summer-bearing)
Flowering on floricanes starts in the second week of June
Ripening date (regular) - fourth week of July
Productivity is 40 kg per plant
Cold hardiness is excellent
Heat tolerance is low
Country of origin - United States
Current status - obsolete or rarely used
Bushes are medium-strong, have semi-erect, long (3-5 m) spineless stems. Height is low to medium (1-1.5 m), plants have numerous side shoots, due to this feature plant seems very spreading.
Hull Thornless starts to bloom in early June, flower's color is white with purple tint. First berries mature at the end of July, harvest period is very long, more than 30 days. Yield is high and stable, up to 45 kg from plant. Fruit are large, have elliptical form, black color with glossy, large-sized drupelets. Single fruits can be very large up to 12-14 g. Firmness is enough for transport. Taste is sour, ripe berries are very aromatic.
Hull Thornless is very low susceptibility to rot diseases, medium-high susceptible to blackberry gall mite. Winter hardiness is excellent, up to minus 23 C.