By all accounts, Ida Severson is tough as nails. But after more than two decades in the landscaping business, she’s eager to embark on a new chapter that isn’t so damn hard on the back and knees.

The opportunity to open a nursery has finally arrived: On Oct. 1, she took over the 54 B Street location that had been occupied by Mostly Natives. Sometime before Thanksgiving, she will launch her own nursery there: The West Marin Landscape Nursery. 

“My dreams are coming true,” she said. 

The new venture will be a partnership with Brian Pedersen, a Novato resident who will own 25 percent of the enterprise. He previously worked as a manager at Plenty, a vertical farming technology company that grew pesticide-free crops in urban towers, promoting food security in underserved communities.

Ms. Severson, 51, will continue to operate her landscaping business, Mesa Chica, but will find someone to oversee the on-site work while she focuses on the nursery. 

She’ll have a big canvas to work with. In addition to the Mostly Natives space, she is taking over the adjacent lot occupied by the Point Reyes Compost Company, a purveyor of premium poop whose leading product is a blend of horse and cow manure known as Double Doody. The compost company will continue production elsewhere.

The reimagined nursery will have nearly twice the outdoor space occupied by Mostly Natives, a longstanding business that moved from Tomales to Point Reyes Station in 2017. Ms. Severson intends to install several greenhouses and will grow 60 to 80 percent of the plants she sells. 

Before launching a career in agriculture, Mr. Pedersen, who has a master’s degree in horticulture, had a successful career as an audio engineer, assisting on projects by Kanye West, Paul McCartney and Rihanna. He grew up in St. Croix, in the Virgin Islands.

Though he keeps a hand in music, his passion is agriculture. “When I die, if I have any control over it, it’ll be among plants,” he said. “They just make me feel good.”

About a year ago, after Plenty radically scaled back, Mr. Pedersen was forced to look for a new job. A friend introduced him to Ms. Severson, and they hit it off. He worked for a time on the Mesa Chica crew and was impressed by her work ethic, artistic eye and management skills.

“That girl will outwork most people on the crew most days of the week,” he said. “And in the middle of it, she’ll drop what she’s doing to take a call, jump in the truck, go meet this person and that person, and then come back and haul soil up and down a mountainside.”

He shares her vision of transforming the nursery into a community space.

“We want to do more than just sell plants,” Mr. Pedersen said. “We’re really into creating a space for people to come and kick it, breathe good oxygen and listen to good music.”

Ms. Severson is hoping to bring in a coffee cart and sell the work of artist friends, but a top priority is serving local contractors. To that end, the nursery will open at 7 a.m., seven days a week and will stock irrigation equipment and anything else a professional landscaper might need, including Double Doody and other products from Point Reyes Compost Company and West Marin Compost.

“I don’t want them to have to go over the hill to get their supplies, because I know what a pain that is,” she said.

She plans to have a soft opening in November, when she will offer “gourmet” potted Christmas trees that can be moved outdoors after the holidays and reused the following year. (She doesn’t want to challenge Toby’s holiday tree supremacy but simply supplement its offerings.)

Meredith Harvey, a former member of the Mesa Chica crew and Ms. Severson’s best friend, is thrilled to see her dream finally come to fruition.

“She’s brave enough to take on something that is a stretch and move through the discomfort associated with stretching to get to the next level,” Ms. Harvey said. “I’ve watched her do it again and again. The nursery is a new moment of stretching into something bigger. Every time, she comes out stronger on the other side.”