Black Petunias (Facts, Care Tips, and Pictures!)

Black petunias are unique and captivating flowers that have gained popularity among garden enthusiasts.

Unlike typical bright and pastel flowers, their dark hue offers a different kind of beauty.

In this article, we will provide essential information about black petunias, including how to care for them effectively. Join us as we delve into the world of this distinctive bloom.

Black Petunia Facts

Black petunias are more visually appealing than other foliage because of their dramatic color.

They are relatively easy to grow, and they last longer than other flowers.

The black petals are tinged with violet hues that shimmer when sunlight is directly shone on them.

Like other petunias, black petunias grow well in most climates including the colder ones.

Very few nurseries grow black petunias, and this means that growing them from seed could be your only option.

Black petunias grow as perennials in plant hardiness zones 10 through 11.

They Are Carnivorous

Did you know that black petunias trap small insects by using the sticky hairs on their stalks?

Once the insect dies and decays, the petunias absorb all the nutrition they can.

Other plants that are known to do this include tomato, tobacco, and potatoes.

Why Are Black Petunias in the Shape of a Trumpet?

The trumpet shape is designed to attract butterflies and hummingbirds into the garden, especially when the flowers are particularly crowded.

Caring for Black Petunias

Black petunias, with their deep, dark blooms, make a bold statement in any garden.

To ensure that these eye-catching flowers remain healthy and vibrant, they require specific care tailored to their needs.

Here are essential tips to help your black petunias thrive:

Optimal Sunlight

Black petunias flourish in full sun. They need a minimum of six hours of sunlight daily. A sunlit location ensures robust growth and more vibrant blooms.

Soil Needs

These flowers prefer well-draining soil. It's advisable to use a quality potting mix when planting in pots. The soil pH should be slightly acidic at 7 and below.


Black petunias do not like to be waterlogged. Ensure they receive consistent moisture but do not allow them to sit in stagnant water.

A deep watering, allowing the soil to dry out slightly between sessions, is ideal.


Feed them every two to three weeks with a balanced, water-soluble fertilizer to encourage blossoming.

Avoid over-fertilizing as this can lead to lush foliage but fewer blooms.


Removing spent flowers, or deadheading, will stimulate new growth and extend the blooming period. This simple practice can lead to more robust, longer-lasting displays.


While they love the sun, in extremely hot climates, black petunias might appreciate some afternoon shade.

Keep an eye out for pests like aphids or whiteflies. If spotted, treat plants with insecticidal soap or neem oil.


If you live in a colder region, consider bringing potted black petunias indoors before the first frost. Place them in a bright, cool location and water sparingly.

For garden-planted petunias, they can be treated as annuals or you can collect seeds for the next planting season.

How to Germinate Tiny Black Petunia Seeds?

The thing about black petunia is that, while they’re easy to grow, their seeds are so small they can easily blow off in the wind.

Here’s a good way to work around this problem: sprinkle the black petunia seeds on a pot filled with artificial pre-moistened soil, but don’t cover them.

Use a small block of wood to ensure they stick to the soil. Follow it up by spraying them with lukewarm water.

Cover the container in a clear plastic bag and place it under a fluorescent lamp for light and warmth. The seeds should sprout up in 6 to 10 days.

At this point, it is important to remove the plastic bag to increase the amount of air circulation to the newly grown green plants.

Make sure the germination process starts at least six to eight weeks before the average last frost date in your area.

When to Transplant Black Petunia Seedlings Outside?

When the sprouts start to touch, it is time to transplant them outside in individual pots.

Use an all-purpose fertilizer to nourish them every two weeks. Touch the soil to see if it is dry. In this case, it is time to water them.

What Do Black Petunias Need for Full Bloom?

Black petunias share the same needs as other petunias, namely, full sun, well-drained, and nourished soil.

A balanced fertilizer, without excessive amounts of nitrogen, phosphorous, or potassium should do just fine.

Protecting Your Petunias Against Frost

Don’t let your black petunias freeze during a frost. Use a layer of mulch on top of the soil to help conserve warmth.

Mulch protects the petunia roots from getting too cold in the event of an unexpected frost.

A neat trick is to cover the mulch over the crowns where the roots and stems merge.

Once frost has passed, remove the mulch from the crowns but leave a thick layer to continue providing insulation to the roots.

Black Petunias Gallery

Finally, if you're looking for black petunias, it's probably because you adore their unique dark look.

We thought we'd wrap up this post with a gallery of gorgeous pictures of black petunia flowers.

1. True Black Flowers

Black petunias are among the blackest flowers you will find in nature.

True black petunia flowers

2. Variegated With Other Colors

You will find other hues present even in black petunias such as purple and red, but this only adds to their charm.

Dark red petunia in blooms potted closeup

Love the variegated look? Check out these tulips: Variegated & Striped Tulips Guide (Pictures & Care Tips)

3. Perfect Contrast

Black petunias contrast beautifully with flowers that have brighter colors such as red and pink.

Flowers of Black Petunia

4. High Impact

You could cover your garden with fleets of black petunias all exclusively. They are somewhat of a novelty and will make an impact on guests.

Petunia 'Crazytunia Black Mamba' flowers

5. Minimalist

Black petunias are perfect for designers who prefer minimalism. They only have to deal with two colors: black and white.

black and white petunia in a pot on a sunny day

6. Attracts Pollinators

The trumpet shape of the petunia is used to attract honeybees. It is both attractive and functional.

Petunia Black Velvet blossoms in a hanging po

7. Sunny Place Plant

Black petunias need at least 6 hours in the sun every day for best results.

Black Petunia growing in a white planter box

8. Add Interest to Your Decor

Black petunias are a great idea for gothic décor ideas. You could pair them with dark espresso cabinetry for a chic twist on contemporary styles.

Gorgeous black blooming petunias on a white background

9. All Elegance

Black petunias are elegance minus all the superficial colors. It’s a great way to enliven your décor.

red petunias and black Petunias at close up shot

10. Violet Hues

Violet hues with patches of black look inviting in any décor.

violet hue Petunia close up shot

Ready to plant your black petunias? You can get seeds online.

Get your Black Velvet Petunia 100 seeds on Amazon.

The Allure of Black Petunias

Black petunias stand out as a testament to nature's endless ability to surprise and captivate.

Their unique shade and elegance present an unmatched allure, making them a prized possession for many garden enthusiasts.

With the right care, as outlined above, these dark blooms can grace your garden with their mesmerizing beauty throughout the season.

For more petunia care tips, read here:

How To Make A Petunia Tree [In 11 Easy Steps!]

How To Overwinter Mexican Petunias

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Black Petunias (Facts, Care Tips and Pictures!)

One comment

  1. I never sowed any b.p. seeds … do the seeds blow in the wind?
    Will the plants survive the winter in Canada if I take them inside before the frost?

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