Merton Thornless blackberry variety
Commercial thornless trailing variety with uniformed fruit and excellent aroma
![Botanical designation](/img/genus_species.png)
Rubus subgenus Rubus Watson 'Merton Thornless'
![Variety denomination](/img/variety_title.png)
Variety denomination - 'Merton Thornless'
![Merton Thornless is the parent for](/img/isparent.png)
Merton Thornless is the parent for Smoothstem, Fantasia
![Plants are](/img/thorns.png)
Plants are thornless
![Bushes have](/img/canes_style.png)
Bushes have trailing canes
![Fruit weight is](/img/berryweight.png)
Fruit weight is 4 g
![Shape](/img/berryshape.png)
Berries have a rounded shape
![Fruiting habit](/img/bramble-season-one.png)
Fruiting habit - floricane fruiting (summer-bearing)
![Flowering on floricanes starts in the](/img/blooming-1.png)
Flowering on floricanes starts in the second week of June
![Ripening date (regular) -](/img/ripening-1.png)
Ripening date (regular) - second week of August
![Productivity is](/img/berryyield.png)
Productivity is 3 kg per plant
![Cold hardiness is](/img/cold-hardiness.png)
Cold hardiness is excellent
![Heat tolerance is](/img/sun.png)
Heat tolerance is low
![Current status](/img/variety-status.png)
Current status - obsolete or rarely used
![Country of origin](/img/country_origin.png)
Country of origin - United Kingdom
Adrienne Ashton Cross Bedford Giant Black Cascade Buckingham Tayberry Dirksen Thornless Fantasia Helen Loch Mary Loch Ness Loch Tay Merton Thornless Tayberry Veronique
Fruits are produced on the previous year’s stems. The main distinctive feature of this variety were medium to large sized fruit and excellent blackberry flavor. Due to its compact growth (max. height is 2,5 m, but stem's length without cropping can achieve up to 7 m in length), this variety was an ideal for planting in small gardens and trials. Plants also demonstrate great yield in half shade or full sun. Merton Thornless has very high resistance to low temperatures (up to minus 26 C), but can be vulnerable to hard frosts on exposed sites.
Cropping season continues from mid August to mid September. Berries are 3-6 g in weight, have rounded or slightly elongated form and glossy black color. Yield is about 2-4 kg per plant, but can grow up to 6-8 kg, when using right cropping and fertilizer. A few strains of this variety exist with different flower colors, either white to pink.
Merton Thornless is still commercially grown in Iran and around the Caspian Sea region as it is highly adaptable, despite being a mid to late variety in colder Western climes. These warmer regions barely get 200 to 600 chill hours where winters are usually very warm. Merton Thornless is very popular in the UK, even though this variety is obsolete, also primarily used for its source of thornlessness in blackberry breeding.
![Diseases resistance](/img/resistance.png)
What diseases is blackberry Merton Thornless resistant to?
![Diseases susceptibility](/img/syringe.png)
What diseases is blackberry variety Merton Thornless vulnerable to?
![Useful Growing Guides](/img/guides.png)