A bramble, composed of canes growing from a root crown.
Productive for 15-20 years.
10' high and as wide.
White, five petals.
Late winter to early spring.
Years before fruiting:
The "berry" is an aggregate fruit, with many small round fruit clustered together, connected
to a center part called the torus. Seeds are relatively large. Blackberries do not ripen if picked unripe.
Months for fruit to ripen:
1-1.5, depending on cultivar. The berries are ripe when fully black.
They are sweetest when they turn from glossy black to dull black.
Storage after harvest:
Blackberries can be refrigerated up to 7 days, but then must be eaten,
cooked or frozen immediately.
Dark green, fuzzy, toothed edges, small spines underneath.
Blackberry canes fall into four groups based on whether they are thorny or thornless and
erect or trailing. Erect canes are somewhat self-supporting while trailing canes need to be trellised.
The first year canes (primocanes) produce leaves with no flowers or fruit. Second year canes (floricanes),
produce flowers and fruit on their lateral branches.
A few cultivars, however do produce flowers in the fall on the top one-third of their first-year canes.
These primocane-blooming cultivars do not as yet perform well in high temperature regions.
Shallow, spread by rhizomes, invasive in moist areas, but sensitive to heat in USDA zones 8
Cultivars of Note
for hot regions:
'Boysenberry Thornless' (Rubus ursinus x idaeus), very large, delicious, fragile,
purple berry, few seeds, harvest throughout summer, its trailing canes need support, 250-350 chill hours,
USDA zones 5-10.
'Ouachita' [pronounced WASH-i-ta] (Rubus ursinus) thornless, large, sweet, firm berry,
mid- to late-season ripening, erect canes, 200-300 chill hours, USDA Zones 5-9. High yields in temperatures
'Rosborough' (Rubus ursinus) The thorns are so numerous, narrow and sharp that it is
exceedingly painful to grow this plant. Even thick gloves may not prevent punctures and pain.
Large, sweet, firm berries, early ripening, erect canes, USDA Zones 6-10. This is the most productive
and hardy of all blackberry cultivars grown in Arizona.
Attracts bees, birds and small mammals that eat the fruit. Blackberries are caterpillar
host plants for the Blackberry Looper moth.
Rabbits also like to eat the canes and bark, so this plant may need a rabbit-proof enclosure.
Toxic / Danger:
Many cultivars are thorny to very thorny.
Northern Hemisphere non-desert regions in Asia, Europe, and North America.