NEW YORK, NY.- Amid the thriving greenery of an indie plant shop called Dig, two living organisms are only tenuously clinging to survival.

One is a neglected wreck of withering vegetation brought in for emergency care. The other is a woman huddled in the corner, her hood up to block out the world. She’s here with her father, Lou, who nearly killed that plant. But as he bickers amusingly with his old friend Roger, the kindly grump who owns the store, she is too bone-weary to engage.

Her name is Megan, and one of the worst misfortunes has blanketed her in grief: the death of her little boy in a notorious accident, which the whole country knows was all her fault. Total strangers despise her for it, yet no one is blaming Megan more mercilessly than she is herself. After a suicide attempt, she is living with her father in the Ohio town where she grew up. So far, it isn’t going great.

“I embarrass him,” she tells Roger after Lou steps out. Preempting any argument to the contrary, she adds: “The truth is the truth and if you try to get around it, it will come after you and take you down.”

The truth and poisonously warped perceptions of it are major themes in Theresa Rebeck’s new play “Dig,” at 59E59 Theaters, and we’ll get to that. First let’s pause to run down the list of off-putting subjects mentioned so far: death of a child, grief, suicide.

But this intelligent, compassionate, beautifully acted dramedy — directed by the playwright for Primary Stages — is not a downer. Rebeck has spiked her script with comedy, and enlisted a cast as nimble with laugh lines as with prickliness and pain.

As Megan, Andrea Syglowski has a coiled, almost feral rage that snaps its tight leash more than once. Just watch her go after Molly (Mary Bacon), a chatty customer who has been trying to figure out why Megan looks so familiar. When the penny drops, Megan turns on her with a scorching intensity.

Alongside mourning and self-reproach, repentance is a motif in Megan’s life; she is forever apologizing. But humor can coexist with all that, and in this hope-filled, distinctly non-Pollyanna-ish play, she is very funny, too.

Swiftly feeling more comfortable at Dig than in her father’s house — Roger (Jeffrey Bean), an absolute geek for plants, has a nurturing vibe — she finagles her way into an unpaid job there, and flourishes a bit. (The set is by Christopher and Justin Swader.) Everett (Greg Keller), the stoner who is the shop’s only other employee, sees her as a rival for Roger’s esteem. And Megan nearly worships Roger, which Everett truly does not get.

“No offense, but you’re like a larva,” she says. “You know, you’re like something that’s not even a bug yet. So I don’t actually expect you to understand.”

One of the judgiest gossips in town, Everett cloaks aggressive cruelty in the guise of honesty. But he has Keller’s charisma and comic chops, so the audience loves him. In an Act II scene between Megan and Everett, he is faced with a choice so morally appalling that a bad decision could change everything we’ve thought about him. I have never felt an audience silently will a character to do the right thing the way it did in that moment.

Hypocrisy and sexist double standards are fundamental to what Rebeck is contemplating in “Dig,” as feminist a play as any of her others. She is examining not just parental guilt — Lou (Triney Sandoval) feels this, too, about Megan — but also deeply ingrained notions about the sanctity of motherhood in particular, and the censoriousness that failing at it brings.

Everett and the many others eager to condemn Megan think they know the truth about her son’s death. Even Lou holds her responsible, but he ought to listen to himself.

“She was always a screw-up,” he tells Roger, “but never in a million years would anyone have believed that she could do something so grotesque.”

Did she, though? Megan has taken the blame, heaped it on herself. She believes to her core that she deserves it.

She confessed to the police. And no one dug any further: It is the mother’s fault.

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‘Dig’Through Oct. 22 at 59E59 Theaters, Manhattan; 59e59.org. Running time: 2 hours.

This article originally appeared in The New York Times.