Himalayan Blackberries prefer to grow on disturbed sites, look for them along back roads where illegal dumping is a problem. This is one of the more means for these plants to get to and pioneer. You will find them along waterways as well.
They have many white flowers with 5 petals, arranged in clusters of 20. The vines are armed with large, sharp thorns. Vines can grow up to 3 meters in height and 12 meters in length and form very thick populations. The leaves are predominantly large and generally grouped in fives on first-year vines and threes on second-year vines. Berries are up to 2 cm in diameter, and soft when ready to harvest. They form on second-year vines and ripen from mid-summer to fall. Each berry produces many seeds.
Blackberries spread by root and stem fragments, birds and animals will eat the berries and the seeds will be discarded in their scat, already fertilized. Humans also contribute to the blackberry spread by purposefully planting them to harvest the fruit. Blackberries can grow in almost any type of soil conditions, they do well even in barren, dry soil but can grow just as well in muddy stream shores. I have seen them high up in the mountains, along the trails we hike.