Naracoorte garden: Mystery plant in surprise sprouting

You might have colourful and quirky plants in your garden, but probably nothing like this.

After years of lying dormant, Bob and Fay McKay have watched a spiky plant in their Naracoorte garden suddenly sprout to life with a large, thick stem shooting several metres into the air and starting to produce flowers.

They've had the plant for well over 10 years, and it's the first time it's produced anything.

Fay said it was a shock to see what they thought was a dormant plant suddenly spring into action.

"It's been there a long time and no one's taken any notice of it," Fay said.

"It's grown very quickly," Bob added. "It's pretty spectacular."

The couple have spoken to experts including Andrew Hutchison about identifying it, and the best guess at present is that is a type of yakka.

The plant is similar to one found in the front yard of Bordertown couple Gordon and Kathy Creaser earlier this year. The Creasers have lived at their property for 56 years, but in April they noticed one of their plants starting to flower for the first time and its stem grew prodigiously to a length of 4m.

They did some research and came to the conclusion that the plant resembles the Agave Americana, also known as a Century plant.

The plant typically lives between 10-30 years, can grow up to 3m tall, and bears a very close resemblance to the Creasers' mystery plant.

They found that after the plant has finished flowering it eventually dies.

If you can shed any light on McKays' mystery plant, feel free to comment on the Facebook post for this article, or email editor.naracoorte@fairfaxmedia.com.au.