Gaye Mullin's plant has taken itself to new heights this week, growing at least another metre and a half.

The sky really is the limit for a succulent that can't seem to stop growing.

In the past week, Gaye Mullin's agave geminiflora, the branchless spike of the succulent, has shot up to about six and a half metres tall.

Only six days ago, it measured about five metres in height.

SIMON O'CONNOR/Fairfax NZ Waitara woman Gaye Mullin is dwarfed in height by her stand-out succulent.

"I can't believe how much it's grown," the Taranaki woman said.

Along with its impressive stature, the plant is starting to flower, with yellow petals beginning to peek through.

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SIMON O'CONNOR/Fairfax NZ Yellow flowers are starting to bloom on the plant.

The plant is a native of Mexico, but Mullin bought hers in 2008 from the Ellerslie Garden Show when it was still held in Auckland.

The Agave Geminiflora is also known as the Twin Flowered Agave and its flowers are tiny, yellow and grow from the stalk in pairs.

About four weeks ago, she noticed the stalk had sprung out from the middle of the succulent, which sits among the lush greenery of her garden in Waitara, north Taranaki.

SIMON O'CONNOR/Fairfax NZ There has been worldwide interest in Gaye Mullin's towering Agave Geminiflora, which is growing at a rate of 15cms per day.

Mullin checked on its growth every day and believed it still had the potential to get even taller.

The unusual plant had also attracted its fair share of attention after Mullin shared photographs of its towering height last week.

She has fielded phone calls from different media outlets in Australia and the United Kingdom and been interviewed on the radio.

SIMON O'CONNOR/Fairfax NZ The sky's the limit for this plant!

Friends had also popped in for a look at the sturdy stalk, which is showing no signs of drooping any time soon.