Rare 20-year-old plant is blooming for the first and last time at Point Defiance

For a short window of time, visitors to Point Defiance Zoo & Aquarium will be in the presence of an unusual sight.
The zoo's botanical garden has been the home and caretaker to an Agave parryi var. truncata, also referred to as an artichoke agave, for more than 17 years. Now, the plant is blooming for the first and only time over the next few weeks, a rare sight in Washington state, far from its natural habitat, Point Defiance Zoo lead horticulturist Bryon Jones told The News Tribune on Thursday.
'This plant is definitely an uncommon sight in the Northwest, and super uncommon to see one actually blooming that you can actually see in a public setting,' Jones said.
According to the University of Arizona Campus Arboretum, the artichoke agave is an evergreen, perennial succulent part of the asparagus family — or asparagaceae — that presents with a blue-gray hue and pointy, toothed leaves growing in rosettes. Agave parryi var. truncata is native to central Mexico, but can also be found in the mountainous areas of the desert southwest, including in Arizona and New Mexico, he said.
Artichoke agave plants typically take 15-20 years to reach maturity, at which point they bloom for one time only before dying, Jones said. During a bloom, the agave will grow a single stalk from its center — Jones said he had first noticed the beginning of the stalk around May 6 and estimated that this agave has reached about nine feet in height, meaning it could still grow taller in the coming weeks. The plant is just inside the zoo's main entrance.
The zoo acquired the plant from a local nursery in Tacoma about 17 years ago, when the plant was the size of a softball — it is likely around 20 years old now, Jones said, adding that he has been working at the zoo's botanical garden for about 20 years and anticipating its bloom.
'All I saw was the middle of it started looking like some crazy alien was starting to come out of the middle of it, and then it came up so fast ... for the last few weeks, it would be two to three feet a week,' he said.
He added that yellow flowers will blossom at the tip of the stalk likely in the next two to three weeks and will probably attract hummingbirds and other pollinators. The flowers should be visible on the plant for another two to three weeks; after that, if pollinated, they will start producing seeds, he said. The stalk, however, will remain in place throughout the summer and likely into fall, he said, adding that the zoo may take it down before winter once it begins to decompose and fall.
Jones said the zoo also has a few other artichoke agave plants growing nearby that may bloom in the coming years; some appear to be a similar size and age, meaning it is possible that two or three blooms may eventually occur at the same time, he added.
'This is the first Agave parryi. Now, there's little agaves, and we've had a couple of those ... their stem is like the size of your finger,' Jones said. 'So, this is the first time we've had one this giant blooming.'
Despite being out of its native habitat, the plant requires little upkeep other than the need to keep it raised to improve drainage and making sure it doesn't get too cold, Jones added, noting that the agave's native habitat often gets colder than the weather in Western Washington, which makes it relatively easy to grow in Tacoma.
Krystle Robbins, a zoo visitor who was admiring the agave on Thursday, told The News Tribune she was impressed by the height of the stalk and enjoyed Jones' longtime investment in the plant and passion for nature. She said she'd be interested in returning to the zoo to see the agave once its flowers bloomed.
'I've never seen one in such a scale in person, it's really beautiful,' Robbins said. 'It's pretty amazing up here in the Pacific Northwest to see something like this.'

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