Phineas and Ferb walked out of their house and into the backyard, where their mother was busy gardening.
After a couple of minutes of watching, Phineas became curious.
"Mom? How hard is it to grow plants?" he asked.
"Oh, it can be pretty hard," she replied. "You have to water them and make sure they're okay."
"What about a greenhouse?" Phineas asked, an idea popping into his head.
"I'm not sure. I've never used a greenhouse," she responded.
Phineas turned to his step-brother.
"Ferb, I know what we're gonna do today!"
2 hours later, Isabella was walking down Maple Drive, followed by her Fireside Girls Troop, when Ginger spotted the top of what appeared to be a glass building.
"Come on, girls! Let's go see!" Isabella said as they ran down the sidewalk.
"Okay, Ferb," Phineas said, holding a clipboard. "Do we have a Sunflower?"
Ferb nodded.
"We got a Rosebush?"
Ferb gave him a thumbs-up.
"How abou-"
"Hi, Phineas!" a girl's voice interrupted him.
Phineas turned and Isabella and the Fireside Girls were walking over to them.
"Hey Isabella," he said with a smile.
"What'cha doin?" she said.
"Looks like they're makin' a greenhouse," Milly answered for him.
Phineas nodded.
"Yeah! Exactly!"
"Can we help?" Isabella asked.
"Sure! We need all the help we can get with these guys!" the boy said as he motioned to the many plants behind him.
The girls looked over, and one of them immediately got their attention.
"What's that one?" Katie asked.
Phineas turned. Katie was referring to the large, red-orange Venus Fly Trap near the back. Ferb walked over to retrieve the plant.
"Oh, that? That's Abdul, our Venus Fly Trap!" Phineas said.
"That's a Venus Fly Trap?" Adyson asked. "It looks kinda weird."
"Yeah, well, we don't know what makes him that way, but we think he's special," Phineas said.
"Well, let's get these plants inside!" Isabella said enthusiastically.
Everyone nodded, and they all grabbed as many plants they could carry and took them into the greenhouse.
"Well, that's the last of 'em!" Phineas said after a whole hour of carting plants.
"I think it looks amazing!" Isabella said.
On the inside, it was hot, humid, and huge. There were plants in every direction, covering every shelf, table, and stool.
"Yeah, you're right," Phineas said.
Gretchen walked over to Phineas.
"The electric heater and automatic watering systems are ready and waiting!" she said.
"Alright, everybody!" Phineas yelled. "It's done!" he said, rousing cheers from the Fireside Girls (and a party tooter from Ferb).