In 1978 , he studied at Ryde School Horticulture .
In 1978 , he investigated potential crops like Davidsonia , riberry , bunya nut and plum pine ( Illawarra plum ) .
In 1978 , he studied at Ryde School Horticulture , and investigated potential crops like Davidsonia , riberry , bunya nut and plum pine ( Illawarra plum ) .