Blackberry

Blackberry is a perennial, semi-deciduous, prickly, scrambling invasive plant. It is a semi-prostrate to almost-erect shrub, with arching and entangling stems arising from a woody crown and forms thickets up to several metres high. The root/crown system is the only perennial part of the plant.
Blackberry flowers are 2-3 cm in diameter, growing in clusters on side branches of floricanes, with five sepals and five white or pink petals and numerous stamens.
Blackberry fruit is in the form of a berry. The berries are 1-3 cm diameter, changing colour from green to red to black as it ripens; each berry an aggregate of many single-seeded juicy segments (drupelets). Fruit develops from late December until April.
Blackberry seeds are deeply and irregularly pitted, light to dark brown, oval and 2-3 mm long.
Blackberry plants have a main vertical root which grows to a maximum depth of 1.5 m, depending on the soil type where it is growing. This root grows from a woody crown which is up to 20 cm in diameter. Numerous secondary roots grow horizontally from the crown for 30-60 cm and then vertically down. There are many thin roots in all directions from the secondary roots.