Hand pollinate the open blooms at night when they are open.Use a soft brush or a cotton bud.

Driving down to Adelaide next week from Darwin.Will try and visit the botanical gardens while there .
My Father has a cactus garden in his front yard ,the golden barrel he has is massive.Hopefully I will be able to expand my collection while there as well.

Thanks for the options
So after many searches and much surfing I'm pretty sure this is the correct ID .
I recall the subinermis part of the name I originally had on a tag .

https://www.cactiguide.com/cactus/?genu ... subinermis

Hello , Had this cactus for many years ,so long in fact my memory has failed and the ID tag is long gone
I know it's something "enermis ".
Ive never seen a flower on it .
Any help IDing this plant would be greatly appreciated

Long time collector with a long hiatus from cactus .Trying to rebuild my collection to once what it was.

Hi from Northern Territory Australia .Long time cactus collector . Trying to rebuild my collection