Behind the scenes, there were also important collaborations between the cast and the crew.

Rooper said, “We also worked with an amazing dialect coach.

Playing opposite Grammer meant a great deal Rooper as a longtime fan.

Jemima Rooper smiling

“Kelsey Grammer is a legend,” she said.

He’s someone I’d completely grown up with.”

Grammer’s casting also marked an important development for the project in Rooper’s mind.

Kelsey Grammer smiling in “Flowers in the Attic”

It wasn’t gonna get buried, and I didn’t know what to expect."

“I had loads of friends who were very excited aboutHarry Hamlin,” Rooper told The List.

But her experience with the actor surpassed all expectations.

Split screen of Jemima Rooper, Harry Hamlin and Kate Mulgrew

“He is one of the most delightful people I’ve ever had the pleasure.

I loved working with him.

It was all too brief.

He was an absolute sweetheart.”

“She’s a bit of a hero of mine,” Rooper said.

“That was probably the one that meant the most to me.

She is a powerhouse.

She’s the most laser-sharp mind.”

“Flowers in the Attic: The Origin” premiered on Lifetime July 9 at 8:00 p.m.

ET, with new episodes airing Saturdays through July 30.