FOOD! Dachas for Perth - why not?

The coronavirus has underlined just how reliant we are on a very long and fragile supply chain for our food. We've got used to getting not just luxury items but staple every day foods from all over the world. How much of the food we consume here in Perth was produced anywhere nearby? I'd guess about 5%? We're very vulnerable here to all sorts of upheaval: there's talk of a lack of people to work in the fields, let alone our changing weather patterns and the reliance on fossil fuel for our industrial agriculture.

Petrochemical use in every part of industrial food production, transport is just one. Notice the current oil price of $26 a barrel. If it costs $60 to produce that barrel of oil how long do you think companies will be producing it?

Meanwhile, the Russians grow about half of their own food on their "dachas" - sort of mini country estates. As I understand it, any Russian can apply for one of these at no cost to himself for the use of the land.

This is from an article in the Small Farmer's Journal.
"Dacha gardening accounts for about 3% of the arable land used in agriculture, but grows an astounding 50% by value of the food eaten by Russians. According to official government statistics in 2000, over 35 million families (approximately 105 million people or 71% of the population) were engaged in dacha gardening. These gardens provide 92% of Russia’s potatoes, 77% of its vegetables, 87% of the berries and fruit, 59% of its meat and 49% of the milk produced nationally. There are several studies that indicate that these figures may be underestimated, as they don’t take into account the self-provisioning efforts of wild harvesting or foraging of wild-growing plants, berries, nuts and mushrooms, as well as fishing and hunting that contributes to the local food economy."
So what's stopping us doing something like that around Perth?