How to Plant, Grow, and Care for Peppercorn Plants

Piper nigrum, the peppercorn plant or black pepper plant, is a very interesting tropical vine. While it only grows as a perennial in very warm climates (USDA zone 12+), gardeners in the southernmost parts of the US often grow the black pepper plant as an annual. You can sometimes bring it inside to overwinter in a warmer location, although it may take quite a bit of space!

With every single savory recipe recommending the use of both salt and pepper (or at least it seems that way), pepper is a ubiquitous spice in most cooking. We go through literal tons of peppercorns every year in the US alone. There are different varieties used for cooking, like Malabar and Tellicherry, and it seems that no meal is complete without them.

Black pepper appears in ancient Greek and Roman texts. However, it gained popularity during the 15th century when the Portuguese explorer Vasco da Gama located it growing on the shores of India. It became an important part of the ensuing spice trade, often referred to as “black gold” or “the king of spices.” The Greeks used it medicinally, and today it is understood to have anti-inflammatory properties.

Planting

Transplant young plants in the spring when the soil is warm and all threat of frost has passed. Plant in an area that gets full sun, ideally with afternoon shade during the hottest part of the day.

You can also grow peppercorn plants in pots (or grow bags) and bring it inside during the winter, or grow them indoors completely. Planting from transplants is the best option, since growing from seed requires approximately four years before the plant reaches the fruiting stage.

How to Grow

Plant care requirements for the peppercorn plants are very specific. When you meet these growing conditions, you’ll enjoy a harvest of your very own black pepper!

Light

Peppercorn plants prefer warm temperatures and full sun to partial shade. Six hours of direct sunlight per day with afternoon shade during the hottest part of the day is ideal. These tropical plants can grow outdoors in USDA hardiness zone 12.

Water

When growing black pepper plants outdoors, water early in the day before the heat rises. Keep the soil moist, but don’t overwater, as this can cause fungal issues that may kill the roots. Allow the soil surface around your pepper plant to dry completely before watering again.

When growing in a container, bottom watering is a great way to reduce the risk of overwatering. Place the pot in a saucer filled with water once a week. This will also increase the humidity surrounding the plant.

Extra organic matter, like compost, will help retain moisture if you’re having issues with the soil drying out too quickly. This plant cannot survive poor soil conditions.

Black pepper plants also require slightly acidic soil with a pH range between 5.5 and 6.5, similar to the range required for blueberries. The same soil acidifiers used for these fruits and for flowers such as hydrangeas and azaleas can lower the pH of your soil to this range. You can acidify the soil in the ground, but controlling the pH of soil in a container is much easier, which is something to consider when choosing how to grow your black pepper plant.

Temperature

They do best in high-humidity areas with temperatures ranging between 75-85°F (24-29°C). Like other tropical plants, peppercorn plants are highly sensitive to frost and freezes. For this reason, most gardeners in the United States grow it as an annual since it cannot survive the winter months.

However, growing a peppercorn plant indoors is also possible. When considering indoor cultivation, choose an east- or west-facing window with the brightest light possible to help your plant access the sun’s energy.

A third option exists if you’d like to grow your own black pepper plants. Aside from growing outdoors or indoors, you can also grow them in a greenhouse where you can keep the soil warm. This is probably the best option because it gives you greater control over humidity levels and overall temperature.

Remember that peppercorn plants stop growing when temperatures drop below 65°F (18°C). If you grow outdoors, wait until daytime temperatures exceed 70°F (21°C) and nighttime temperatures don’t drop below 60°F (16°C).

Peppercorns prefer about 50% humidity. You can purchase plant-specific humidifiers to help achieve this. 

Fertilizing

Peppercorns are considered light feeders. In the spring, provide a fertilizer meant for blooming plants, which tend to have an NPK of 7-9-5. You can also fertilize every two weeks during the summer. This encourages the production of blooms, which then turn into the peppercorn itself as it fades and grows black.

Although they resemble a small berry, peppercorns are actually considered a drupe, which is more closely related to stone fruit. Fertilizing is not necessary during the fall and winter months.

Pruning

This woody perennial flowering vine can grow up to 30 feet long if left unchecked! However, most gardeners choose to prune this plant. Pruning back the main growth point at the leaf nodes encourages the production of lateral shoots, resulting in even more flowers that grow off the side shoots, looking like pendulous spikes. As the flower spikes fade, they grow black, revealing fresh corns.

Prune about six months into the growing season, as this is when the flowers begin to set. In areas where this plant grows in a perennial garden, you can also prune it back aggressively in winter, and it will push out new growth in spring. As regular maintenance, prune away any dead, damaged, or diseased leaves throughout the season.

Propagation

You can start peppercorn plants from seeds. However, they are slow-growing and can take up to four years before they produce flowers and set fruit. For this reason, the preferred method of growing black pepper is from started plants that are already established.

You can also grow peppercorn plants via cuttings. These plants naturally set roots wherever the vine touches the ground, which makes it very easy to get cuttings to take root in your garden. If you happen to have a friend who grows black pepper, this may be a viable option for you to begin growing your own!

Harvesting

Despite their contrasting appearances, black, white, green, and red peppercorns all come from the same plant! Black peppercorns are mature, dried fruit. These fruits start green, then blush and turn red. Finally, they grow black after picking and drying.

White peppercorns are the inner portion of mature dried fruits. To produce them, soak black pepper in water for days at a time, then peel away the outer husk to reveal white pepper.

Green peppercorns are immature fruits that taste more earthy and citrusy than when left to mature. You can harvest them early, dry them, and produce green pepper. Pink peppercorns come from the Peruvian pepper tree, which is not the same as Piper nigrum. Once you have harvested your peppercorns, prune back the spent spikes to encourage more flower production.

Storing

After harvesting from your garden, regardless of what stage (green or red), quickly blanch the peppercorns in boiling water to clean the exterior before drying. Once fully dried, you can store them. If you’d like to save seeds for future plantings, skip this blanching process, as it will sterilize the seeds and they will not produce more pepper plants.

Whole peppercorns retain their flavor the longest, so storing them this way gives your harvest longevity. Reserve grinding for just before you plan to use them. Pre-ground black pepper begins to lose its flavor at about four months because of its increased surface area and greater exposure to sunlight, oxygen, and moisture. It can even take on a bitter flavor.

Store whole peppercorns from your garden in an airtight container away from direct sunlight, such as in a pantry. If you have harvested fresh green peppercorns and chosen to pickle them, they will last for one month after opening and you’ll need to store them in the refrigerator.

Troubleshooting

Some issues could drastically reduce the chance of bringing your pepper plant to the point of fruiting. To maximize your chance of reaping a harvest to add to your own food, let’s discuss a few troubleshooting topics.

Growing Problems

Most growing problems relate to poor soil conditions. If you notice lackluster growth or browning of the leaves, this could indicate insufficient soil pH levels. You can purchase soil test kits at most big-box stores and use them to determine whether this is the issue. Soil acidifiers are readily available at these stores as well, should you need to lower the pH. Follow the instructions on the back of the bag, indicating the necessary ratio of acidifier to add to your soil.

When growing in containers, plants can also sometimes become root-bound. Symptoms include yellow and brown leaves, new growth that wilts quickly, or stunted growth. If you suspect this is the case, repot your plant into a larger container. If the roots have begun to spiral around themselves, gently tease them apart when transplanting.

Pests

If you notice ragged, uneven holes chewed into the leaves of your black pepper, you may have a flea beetle issue. These small, black jumping beetles can decimate foliage if the infestation goes unchecked. Tachinid flies and certain parasitic wasps are natural predators of this beetle, and in a balanced ecosystem, they generally show up shortly after the beetles to feast on them.

If human intervention is required, you can control flea beetles with the application of neem oil. You can also deter them by intercropping with thyme and mint, as these beetles are repelled by the strong scents of these plants.

Diseases

Root rot is the most common disease affecting black pepper plants. For this reason, it’s better to underwater rather than overwater to avoid creating the perfect conditions for this fungal infection to take hold, especially if you grow indoors. Container-grown plants can easily become waterlogged.

The symptoms of rot appear as a soft, mushy stem, wilting, and rotten roots. This type of rot is harder to recover from but can be remedied if fresh, white roots remain that have not yet turned to mush. Cut back the rotted roots and replant into dry soil.

Frequently Asked Questions