Chester Thornless blackberry variety

Rating [ 4.7 ]

Very vigorous, thornless, large fruited, late ripening blackberry variety with long harvest season

Botanical designation

Rubus subgenus Rubus 'Chester Thornless'

Originated from a cross of

Originated from a cross of Thornfree x SIUS 47

Variety denomination

Variety denomination - 'Chester Thornless', tested as SIUS 68-6-17

Plants are

Plants are thornless

Bushes have

Bushes have semi-erect canes

Fruit weight is

Fruit weight is 5 g


Berries have a rounded shape

Fruiting habit

Fruiting habit - floricane fruiting (summer-bearing)

Begins to bloom in the

Begins to bloom in the second week of June

Harvest season starts in the

Harvest season starts in the fourth week of July

Productivity is

Productivity is 14 kg per plant

Soluble solids

Soluble solids - 9.6%

Cold hardiness is

Cold hardiness is good

Heat tolerance is

Heat tolerance is moderate

Country of origin

Country of origin - United States

Current status

Current status - cultivated (actual)

Chester Thornless is a very vigorous, thornless, large fruited, late ripening blackberry variety from United States. Cross was made in 1968. This is one of the most popular blackberry variety in the world. It was recommended as a replacement for Thornfree cultivar.
Canes are semi-erect after the first year recumbent growth. Canes length typically achieves 3-4 m and needs trellis support. Harvest period continues from the end of July to the end of September. Yields of Chester Thornless vary with production area, up to 31 kg/plant from healthy plant. Taste and flavor are depend on local growing conditions and weather. In different regions with similar cultivation methods taste and flavor vary sufficiently. Mean mass of berry averages 5 g, seeds are relatively small. Berries have very intense black color and are firm. Winter hardiness is up to minus 18.
Table 1. Comparison table of yield and average berry weight of Chester Thornless blackberry
Cultivar Yield, kg/plant Harvest date Berry weight, g
1975 1976 First Last
Chester Thornless 27.0 31.1 28/7 23/9 6.7
Dirksen Thornless 4.3 9.9 18/7 15/8 6.0
Thornfree 9.2 18 18/7 26/8 5.0
Black Satin 17.6 6.5 21/7 08/9 6.6
Smoothstem 8.9 11.5 06/8 09/9 5.0

Diseases resistance

What diseases is blackberry Chester Thornless resistant to?

Chester Thornless has very good resistance to diseases such as Cane BlightCrown GallOrange RustVerticillium Wilt
Diseases susceptibility

What diseases is blackberry variety Chester Thornless vulnerable to?

No susceptibility to spicific pests or diseases has been observed for Chester Thornless
Useful Growing Guides

Useful Growing Guides:

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Reviews of the variety Chester Thornless

Review from [EXYU TRAVEL & NATURE]

Kupina sorta Chester blackberry. Saveti za uzgoj kupine.

Review from [FRED]

I might try another blackberry one day, but for me blackberry Chester is the best - none matches it for production or disease resistance. Find the space for it you won't be disappointed. The fruit taste is deliciously sweet when ripe and the blackberries very large. You will be picking them virtually every day from Aug until end of Oct. Incredible plant and its flowers are a pretty pink which the bees adore.

Review from [ERIC]

This site certainly knows its blackberries. The daddy of them all must be Chester Thornless. Wonderful tasting fruit, lovely pink flowers. This plant certainly lives up to its hype.

A big plant with vigor that never ceases even in old plantings and potentially it can give crops of over 20kg, if you let it grow to its full potential.

Crops late July until early frosts under an open car port frame. Unmatched and probably still the no1 commercial plant in the world due to its hardiness and disease resistance!

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