Is it cold enough in the eastern suburbs of Sydney for a Pine Nut tree to 'fruit'?
The tree that produces edible pine nuts is the Stone Pine or Umbrella Pine, Pinus pinea. It is a native of the Mediterranean region and it does produce the cones that contain the delicious nuts in Sydney.
The tree is relatively slow growing but is suited to landscaping in public parks.
There is an accidental plantation of pine nut trees at the southern end of the parkland fronting Botany Bay along Grand Parade, in San Souci in the southern suburbs. The trees were seedlings in the 1930s, intended for planting along the foreshore. They were abandoned during World War Two and had established by the time the war ended. It was decided to leave them where they had taken root in the sandy soil and they have since grown into a mature urban forest, an edible landscape if anyone had the intention and means of harvesting them.
The main beneficiaries of the plantation, apart from humans picnicking in their shade in summer, are squadrons of parrots that feed on the tasty nuts.
Rob Fletcher from Agriculture Faculty at University of Qld (Gatton) wrote about this in New Crops about 10 years ago. You could try contacting him for growing notes: firstname.lastname@example.org Further to what Russ Grayson wrote you can read about the Botany Bay specimens at -