Table 1. Comparison of average yields (kg/m²) and (kg/m²/30 days) among previous research and the EG results.

These results were calculated for the previous studies.

Year	Project name / Authors	No. garden areas (& type)	Location	Reported yield (kg/m2)	Average yield (kg/m2 /30 days)	Further Details
1979	Stall [6]	1 (created)	Florida, USA	6.79	0.850	Duration: 8 months; Area: 13.9 m2; Measured: costs (not include. water), yield & retail value.
1980	Stephens et al. [7]	2 (created)	Florida, USA	2.70	0.450	Duration: 3 months; Area: 189.27 m2; Measured: labour, costs, yield & retail value.
1985	Cleveland et al. [5]	2 (created)	Arizona, USA	1.20	0.020	Duration: 2.5 & 3 years; Area: 135.7 m2; Measured: labour, costs, water use, yield & retail value.
2014	CoDyre et al. [10]	50 (existing)	Ontario, CAN	1.43	0.006	Duration: 4–5 months; Area: (approx.) 627.5 m2; Measured: labour, costs, estimated yield weights & retail value.
2014	Zainuddin & Mercer [31]	15 gardens (existing)	Melbourne, AUS	0.35	0.020	Duration: 3 months by each participant within a 1 year span; Area: 1096 m2; Measured: yield & food sharing.
2016	Algert et al. [9]	16 in 8 gardens (created)	California, USA	6.00	0.188	Duration: 17 weeks; Area: 48 m2; Measured: yield, retail value & food sharing.
This study	all five main method-crop areas	82 in 34 gardens (existing)	South Australia, AUS	2.70	0.370	Duration: 1–19 months by each participant within a 19-month span; Area: 3023.3 m2; Measured: labour, costs, water use, yield, retail value & food sharing.
This study	only veg/vegh/ herb/other (mixed) areas	47 in 34 gardens (existing)	South Australia, AUS	3.40	0.470	Duration: 1–19 months by each participant within a 19-month span; Area: 922.3 m2; Measured: labour, costs, water use, yield, retail value & food sharing.