How to Grow and Care for Black Bamboo

Few bamboo varieties are as visually striking as Phyllostachys nigra, commonly called black bamboo. Tall, black stalks are accentuated by small, medium-to-dark green leaves and a dense, clump-forming growth habit.

This makes it popular with gardeners looking to create dense hedges or natural privacy screens. Its exotic colors also suit various design styles, making black bamboo a popular choice for large containers and garden beds.

There are several bamboo species with the common name “black bamboo.” Unlike the others, such as Dendeocalamus asper cv. ‘Hitam’ and Gigantochloa atroviolacea, P. nigra is one of the only varieties of black bamboo with a running instead of clumping growth habit. This makes its spread aggressive and prolific, requiring regular monitoring and maintenance to ensure it does not get out of hand.

Nevertheless, with the proper knowledge and care, P. nigra makes a great addition to any yard or landscape. Here’s everything you need to know about how to grow and care for this stunning bamboo variety.

Black Bamboo Care

Here are the basic requirements for growing black bamboo:

• Choose a growing location with several hours of direct sunlight for best growth.
• Plant in rich, well-draining soils and provide extra nutrients with regular fertilization during the growing season.
• Keep the soil evenly moist.
• Control the height and size of your bamboo grove with regular pruning, root pruning, or root barriers.

Warning

P. nigra is a prolific grower that spreads in a running habit by underground rhizomes. When planted directly in the ground, diligence is required to ensure its growth stays in check, as its aggressive spreading has the potential to be very invasive. Root barriers are often used to control the size and spread of bamboo groves, along with seasonal root pruning. Consult your local extension office to see if the plant is listed as invasive in your area.

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Light

Black bamboo appreciates plenty of light. While a location that receives several hours of direct sunlight is ideal, this plant will also tolerate partially shaded locations. Note that growth may be slower and leggier in lower light, which isn’t always a bad thing for this prolific grower.

Soil

This hardy bamboo variety requires rich, well-draining soil to thrive. A mixture of 50% organic (such as compost, manure, humus, etc.) and 50% inorganic components (like sand, perlite, pumice, silt, etc.) is a good place to start. The soil should retain some moisture while still being well-draining and preventing waterlogged soil.

Water

Water your black bamboo regularly to keep it hydrated and the soil evenly moist, especially right after planting. Plants grown in containers must be watered more frequently, as much as every other day, depending on the pot size, temperature, and humidity levels. A light layer of mulch around the base of the plant can help retain moisture.

Temperature and Humidity

Black bamboo is known for being one of the hardiest varieties of bamboo, growing well in USDA zones 7 to 11. It thrives in warm temperatures and high humidity and is not frost-tolerant.

For those living in areas with harsh winters, black bamboo is best grown as a container plant and overwintered indoors until the threat of frost has passed. Ensure you choose the sunniest spot in your home and provide supplemental humidity to help the bamboo survive the winter inside.

Fertilizer

In addition to nutrient-rich soil, black bamboo benefits from regular fertilization during the growing season. Use a high-nitrogen fertilizer in the spring and summer to give your plants an extra boost.

Pruning

Since black bamboo can reach up to 30 feet in height, pruning is often desired to control its size in the garden. Pruning is best done in the spring using a pair of clean, sharp pruning shears. The nodes along the stalks provide an easy visual cue on where to cut back the height of each stalk. Prune each stalk just above a node.

Root pruning may also be required to control the spread of black bamboo. This is best done in early spring. Use a sharp spade to work around the clump of bamboo, driving it into the ground and cutting off any stray plants and rhizomes that have spread outside your desired perimeter. Remove severed roots, rhizomes, and small plants from the ground afterward to prevent them from rooting and growing.

Propagating Black Bamboo

Due to its habit of spreading growth, black bamboo can be easily propagated by division. It’s best to divide it in late winter or early spring before the growth has taken off for the season.

1. Prune back the top two-thirds of the culm before you start.
2. Dig up the clump of bamboo you plan to divide using a large shovel to get under the root ball.
3. Divide the rhizomes and roots into two or more clumps using a shovel, saw, or axe to cut them.
4. Transplant the divisions immediately. The holes should be twice as large as the plant’s root ball. Fill the excess space with plenty of rich, well-draining soil.
5. Water the freshly replanted black bamboo well.

Potting and Repotting Black Bamboo

Growing black bamboo in containers is an excellent option to avoid planting this prolific grower in the ground or for those with smaller yards and gardens. However, black bamboo grown in pots requires more diligent care since the soil will dry out quickly, and the plants must be repotted frequently.

Black bamboo should generally be repotted once it becomes root-bound. Always choose a new pot twice as big as the plant’s root ball to provide ample space for spreading.

Since this bamboo variety grows so tall, it’s also a good idea to weigh down the planter with a layer of rocks at the bottom beneath the soil. This will help prevent the plant from becoming top-heavy and blowing over in the wind.

Common Pests and Plant Diseases

Bamboo is generally pretty pest-resistant, and black bamboo is no exception. However, it’s not entirely exempt from common garden pests like aphids, mealybugs, spider mites, scale, and bamboo mites, especially if there’s already an infestation in your garden.

Preventing pest infestations is far easier than treating them, so always inspect new plants closely for signs of pests before bringing them home.

Black bamboo is also susceptible to a few common diseases, including root rot, bamboo blight, sooty mold, and rust. Monitor your plants closely to ensure you catch signs of disease early so treatment can be applied accordingly.

Common Problems With Black Bamboo

Black bamboo is known for being hardy, prolific, and relatively problem-free. However, you may encounter a few common problems when growing black bamboo at home.

Rapid Growth

Black bamboo can quickly spread and take over gardens and landscapes if left unchecked. As a non-native species, this presents the possibility for black bamboo to become invasive, which can harm the local ecosystem. Beyond these more significant implications, having black bamboo take over your yard can be a frustrating nuisance.

For these reasons, it's essential to be cautious of where you plant black bamboo and have a plan for managing its growth. Regular pruning, root barriers, and keeping this bamboo variety contained in planters or raised beds are all ways to ensure it doesn't get out of hand.

Leaves Turning Yellow

Yellow leaves are one of the most common problems with black bamboo. There are several potential causes, including sudden and drastic changes in temperature, light, and humidity, which can cause the plant to experience shock and, therefore, yellow leaves.

Yellowing leaves can also result from improper watering, inadequate drainage, pest infestations, and root rot. Closely examining your plant’s growing conditions, root health, and leaves (for pests) is a good place to start when investigating what may be causing this problem.

From: thespruce