The era of big shave is over in the Bronx, with New York Yankees ownership allowing “well-groomed” beards on the ballfield for the first time in half a century.

But as New York City beard maven Cassondra Kurtz points out: “A well-groomed beard? That can mean a lot of things.”

Does the beard have to be short or just shaped? Will there be length limits or will players be cultivating ZZ Top-style birds’ nests? Will a front-office employee be named the facial hair enforcer? (Looking at you, George Costanza.)

Until a more hirsute starting lineup takes the field this year, we won’t really know how Yankees chairman Hal Steinbrenner defines “well groomed.”

But Kurtz, founder of Beyond the Beard, a barber shop on the Upper East Side, gave us some time-honored advice in face-mane maintenance — whether you’re hitting dingers in Yankee Stadium or striking out in slow-pitch at the Prospect Park Parade Ground.

A beard requires more than just not shaving

“A common misconception amongst a lot of men who come into our shop is that they think if they want to grow their beard out … they just don't touch it,” Kurtz said. “What that ends up doing is, that creates breakage, damage and, as a result, frizziness and perceived messiness, quite frankly.”

Just like your hair, a beard needs a little trim every now and then to get rid of the split ends and encourage healthier growth.

Hydrate, bro

A beard needs regular attention, even if you’re not trimming.

“Make sure to use beard oil, to use facial moisturizer, a beard balm,” Kurtz said. “Anything that's hydrating is going to help until you can see a professional — if you don't feel comfortable doing it yourself.”

Beard oil is just what it sounds like: a viscous, hopefully nice-smelling substance that makes the beard moist and shiny. Beard balm is like a pomade for your face. You can rub it through your chin warmer to shape and smooth any frizz. If you’re looking to get really shaped, try a mustache wax or beard wax. There are reams of reviews of these products online. You could also just ask your local barber.

But Kurtz warns you have to take care of the skin under your beard along with the beard itself, which means facial moisturizers and other skin care products.

“My rule of thumb is, if it's not good for one, like your skin, then it's not good for the other, such as your beard,” she said.

Clip it

If you’re looking for an excuse to buy more gizmos, get yourself some electric clippers. You can use them on anything from the closely cropped perma-shadow to the knee-length banjo muffler.

“ Invest in good tools,” Kurtz said. “While the upfront costs might be a little expensive, long term, they're going to work well for you and they're going to leave your skin feeling good as well.”

If you’re not looking to drop a bunch of cash, a perfectly functional clipper with attachments can run you about 30 bucks. Our colleagues over at New York Magazine recently ranked some professional favorites.

Treat yourself

This is New York City, where personal grooming and luxury are big business. Don’t be afraid to treat yourself to a beard sesh. Kurtz’s shop specializes in beards, but there’s no shortage of barbers who offer hot towel shaves, trims and treatments throughout the five boroughs and beyond.

Ryan Kailath contributed reporting.