Response

Yes, they are! When you are picking wild blueberries in Maine, color differences—ranging from bright, powdery sky-blue to deep, glossy black—are primarily due to genetic differences between the plants.

Unlike cultivated blueberries (which are planted as uniform rows of the exact same variety), wild blueberries grow in diverse, naturally occurring patches called clones.

Here is what is happening with those much darker berries:

1. Different "Clones" (Genetic Diversity)

Wild blueberry fields (barrens) are not planted from seeds. Instead, a single wild plant spreads underground through stems called rhizomes, creating a dense patch of genetically identical stems known as a clone. A single field in Maine can contain hundreds of different clones growing right next to—and overlapping with—each other.

Each clone has its own unique genetic traits, which affect: * Berry size and shape * Flavor profile * Berry color

One clone might naturally produce light-blue berries, while the clone growing right next to it produces deep, dark blue or black berries.

2. The "Bloom" (Waxy Coating)

The light blue color of standard wild blueberries is actually an optical illusion caused by a natural waxy coating called the "bloom" (or epicuticular wax). * The bloom protects the berry from moisture loss and insects, and it scatters light, making the berry look dusty sky-blue. * Some clones naturally produce a heavy bloom (very light blue), while others produce little to no bloom at all, revealing the berry's natural deep-blue or black skin.

If you rub a light blue wild blueberry between your fingers, you’ll rub the bloom off, and it will look just as dark as the shiny black ones!

3. A Distinct Species/Variety: The Black Lowbush Blueberry

While most wild blueberries in Maine are Vaccinium angustifolium (sweet lowbush blueberry), there is a distinct variety/subspecies that grows right alongside them called the Black Lowbush Blueberry (Vaccinium angustifolium var. nigrum or Vaccinium nigrum). * These plants produce smooth, shiny, jet-black berries with virtually no waxy bloom. * Their leaves also tend to be a slightly deeper blue-green color compared to standard lowbush plants.

Are the dark ones safe/good to eat?

Yes, absolutely! They are 100% edible and completely safe. Many local Mainers and experienced foragers actually seek out the dark ones. Because they are often a bit sweeter or have a slightly more intense, tangy blueberry flavor, they add a great mix of flavor when harvested alongside the lighter ones.

Response

He has fantastic taste! Your 10-year-old has actually stumbled onto a secret well known to hardcore Maine berry pickers.

There are a few really cool reasons why kids (and adults!) often prefer the black lowbush berries:

• More Intense Flavor: Because they tend to have slightly lower acidity and high sugar content, their flavor comes across as richer, sweeter, and more concentrated—almost like a natural blueberry candy.
• Better Texture (No "Dust"): That powdery waxy "bloom" on light blue berries can sometimes give them a slightly dry or dusty feel on the tongue. The smooth, shiny black ones don't have that coating, so they feel smoother when you bite into them.
• The "Treasure Hunt" Factor: Since they stand out against the sea of light blue, hunting specifically for the dark ones makes picking feel like a game!

Fun challenge for him next time you are in the barrens: Tell him to look at the leaves before he looks at the berries! The black lowbush plants usually have deeper, blue-green leaves that aren't quite as shiny as the standard lowbush leaves. If he can spot the leaf difference, he can find the "black gold" patches before anyone else! 🫐✨