Himalayan blackberry at Centennial Park

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Going through the pain barrier, that’s what makes the muscles grow. There’s this pain, this aching, and going on and on and on. That’s what divides a champion from a non-champion - having the guts to go through the pain barrier. Arnold Schwarzenegger, The Guardian (May 2009)

The flowers are produced in late spring and early summer on panicles of 3–20 together on the tips of the second-year side shoots, each flower 2–2.5 cm diameter with five white or pale pink petals.
Rubus armeniacus (Wikipedia) Rubus armeniacus, the Himalayan blackberry or Armenian blackberry, is a species of Rubus in the blackberry group Rubus subgenus Rubus series Discolores (P.J. Müll.) Focke. It is native to Armenia and Northern Iran, and widely naturalised elsewhere. Both its scientific name and origin have been the subject of much confusion, with much of the literature referring to it as either Rubus procerus or Rubus discolor, and often mistakenly citing its origin as western European. Flora of North America, published in 2014, considers the taxonomy unsettled, and tentatively uses the older name Rubus bifrons.