Terryc wrote:

Funnily, the best method here, seems to be the old tyre stack, so we
will try more of that in future. I also have to fill the upper tyres
with dry straw and nothing else.


That makes sense, potato roots like a cool moist, but well drained, soil
that is rich in compost, but the top of the plant prefers a warm dry
environment.

The method you describe should make the most of the climate in Sydney, just
make sure the stacks are in a very sunny spot with good airflow and keep
the soil just moist. If you cover the tires with something white it will
help keep the roots cool and reflect the light up into the leaves where it
is needed.

If you get the microclimate perfect you will get the most out of the plants,
even if they die back faster than they would in an ideal climate.

If you want to find a spud that grows well in your area then you could try
growing them from seed (yes SEED) the first year you will only get tiny
potatoes, but the genetic diversity with be very high, then select the best
performers to plant (the tubers) for the next year. it could take you a few
years to get a better adapted plant, but it is possible.

Check out this web site,
http://daughterofthesoil.blogspot.co...erminated.html