Penelope the corpse flower is in bloom at Milwaukee’s Mitchell Park Domes.

Penelope, which last bloomed in 2024, will be open and stinking for the next 24-48 hours. This rare and very large flower only booms every couple of years; when it does, it emits a powerful – and disgusting – odor.

“Typically they only bloom once every six to eight years, ” said Amanda Garchow, horticulturist at the Domes. “Penelope’s a little different in our case; this is her second bloom in two years, so it’s extra exciting for us because it’s a rare event that’s she’s blooming so soon.”

The ephemeral nature of this plant and its experience has gathered somewhat of a cult following, according to Bryan Connolly, botanist and associate professor of biology at Eastern Connecticut State University, who once had someone visit his greenhouse with a corpse flower tattoo on his leg.

Below, with some help from Connolly and Garchow, we answer questions about this fascinating plant.

What exactly is a corpse flower?

The corpse flower, also known as a Amorphophallus titanum to scientists and “titan arum” to fans of David Attenborough’s “The Private Life of Plants,” is a flowering plant native to rainforests on the Indonesian island of Sumatra. It is known for its putrid smell, often compared to the scent of rotting flesh, and for only blooming for 24-48 hours every couple years.

Why does it take so long to bloom?

It needs to accumulate enough nutrients. The corpse plant starts as a seed or, if it’s already bloomed, an underground tuber-like corm (think potato). Both produce a really large leaf, which can be up to 15 feet tall.

“There’s no stem when it’s not flowering, and so it has a petiole, which is part of the leaf that looks kind of like a stem, but it’s not a stem,” Connolly explained. “They can get very large, like bigger than your thigh around.”

The leaf generates sugar – food for the plant – and stores it in the underground corm.

After a year, the leaf dies, and the tuber rests for four months. Then it produces a new leaf and repeats the cycle until the tuber becomes large enough. This takes about seven to 10 years for a new seed and three to four years for a corm that’s bloomed before.

The corm of a corpse flower is the largest of any flowering plant. According to Connolly, the biggest one has been up to 200 pounds, but they’re typically more like 60 pounds.

Why the rotting meat smell?

To attract pollinators. After years of tuber growing, the tuber eventually produces a spike, formally known as a spadix, of flowers wrapped in a specialized leaf called a spathe. Female and male flowers grow in a ring at the bottom of the spadix. This stage is called an inflorescence, which is a group of flowers.

The corpse flower is the world’s largest unbranched inflorescence or group of flowers.

Eventually, as the spathe opens, the spadix heats up to about 99 degrees F and the flowers begin to emit pulses of powerful odor to attract insects, like carrion beetles or fruit flies, that typically eat or lay their eggs on rotten meat. These insects pollinate the flowers at the base of the plant.

Are there benefits to being pollinated by insects like fruit flies and carrion beetles instead of more common pollinators like bees?

Not really.

According Connolly, it may be related to the plant’s native environment. Corpse plants can be miles apart in a rainforest, and since they bloom infrequently they can only be pollinated and reproduce every few years. Because of that, it could be advantageous to seek pollinators that are willing to travel long distances between plants.

What makes it smell so bad?

Chemists have isolated identified over 40 compounds that make up the odor released by the plant. Some of the chemicals include two that smell like garlic (dimethyl trisulfide and disulfide), one that smells like sulfur (methanethiol), one that smells like citrus (limonene), one that smells like feces (idole), and one that smells like urine (phenylalanin).

Why should I care?

There is inherent intrigue to a smelly plant named Penelope. But also, corpse flowers are an endangered species due to loss of habitat, climate change and encroachment from invasive species. Garchow said that it’s estimated there are only 800 left in the wild.

Additionally, these plants are difficult to conserve via seed preservation because their seeds aren’t viable after drying.

Therefore, they must be conserved in living collections in gardens, research labs or greenhouses and conservatories like the Domes.

Since they can’t self-pollinate, despite having both male and female flowers, they must be pollinated by another plant. Different research labs and greenhouses often rely on sending stored pollen to each other to keep these plant lines going.

“I’m really thankful that we have this giant, smelly, weird plant that, you know, kind of brings botany to the public,” said Connolly with a smile. “And just the conservation of plants and of the species in general.”

The Domes will have extended hours on Saturday and Sunday to accommodate visitors who want to see the corpse flower in bloom, though the smell will mostly fade by Sunday. Stop by to see Penelope, support important conservation work and acquire a unique, albeit smelly, experience.

The Dome, 524 S. Layton Blvd., will host extending hours for this event, from 8 a.m. to 4 p.m. both days. Admission is $10 for adults ($9 for residents), $6.50 for ages 3-12 and free for children younger than 2. Due to road construction and the closure of the 27th Street bridge, the Milwaukee Domes Alliance suggests using GPS to plot a route. Directions and more information, including specific discounts, are available at www.MilwaukeeDomes.org.

Reach Donnisa Edmonds at DEdmonds@usatodayco.com.

A shooting in north Minneapolis injured two men on Friday night.

Minneapolis police said officers responded around 9:30 p.m. Friday after multiple reports of gunfire near Lowry Avenue North and North Logan Avenue.Police said they found two men with gunshot wounds outside a home.

Officers said both men were outside when the gunfire started and a nearby hospital treated both men for non-life-threatening injuries.

Police are still investigating. Officers said no arrests have been made.

This is a developing story; check back for updates.

TODAY

Mostly cloudy and muggy with scattered showers around at times, and thunderstorms becoming more likely this afternoon. Highs reach the low 80s, with a light east wind. Much of the morning still looks manageable, but by later today a few storms could become stronger, especially across the southwest half of central Indiana, with locally heavy rain and gusty winds the main concerns.

TONIGHT

A few showers and thunderstorms may linger through the evening before coverage gradually fades later tonight. Lows settle in the upper 60s, with a light northeast breeze. It will not rain all night everywhere, but the evening still carries enough of a storm threat to keep a weather eye nearby.

TOMORROW

Partly sunny, warmer, and much less active. Highs climb into the mid 80s, with a light south wind around 5 mph. After the unsettled Saturday, this looks like a far more usable day for outdoor plans, and most of central Indiana should stay dry from start to finish.

TOMORROW NIGHT

Partly cloudy and warm, with lows in the low 70s and a light south southeast breeze around 5 mph. Humidity stays elevated overnight, so it will feel a bit more summerlike than recent nights. Quiet weather continues.

MONDAY

Sunny and hot with highs pushing into the low 90s. A south southwest breeze around 5 to 10 mph keeps the air moving, but the bigger story is the heat and humidity building in. This looks like the hottest day so far this season, and heat index values over 100 are possible during the afternoon, so outdoor plans will need extra water and more breaks.

MONDAY NIGHT

Mostly clear and warm, with lows around the mid 70s. A light south southwest breeze continues overnight, and there will be very little cooling after sunset. It stays dry, but the muggy feel hangs on.

TUESDAY

Sunny and even hotter, with highs in the low to mid 90s and a light southwest breeze around 5 mph. This is another day where the heat becomes the main impact, and it will not take long to feel it during the afternoon. Outdoor work and summer activities will need to be paced carefully.

TUESDAY NIGHT

Clear and warm again, with lows in the mid 70s and a light southwest wind. The air remains sticky overnight, and there is still no meaningful rain signal for Indianapolis.

7 DAY FORECAST

After today’s storm chances taper away, the pattern flips quickly toward heat and humidity. Sunday looks quieter and warmer, then Monday through Thursday all trend hot with highs in the 90s and heat index values over 100 possible at times. Rain chances stay very low through midweek, with the next better chance for storms not returning until Friday. Overall, the bigger concern after Saturday becomes summer heat rather than repeated storm chances.