Solanum erianthum — an easy houseplant, prefers full sun light
SPECIMEN · FROM THE LIBRARY
Solanum erianthum

Solanum Erianthum

Updated · 108 observations
ON THIS PLANT

Solanum erianthum is a species of nightshade that is native to southern North America and northern South America. It has been introduced to other parts of the world and has a nearly pantropical distribution. Common names include mullein nightshade (that may also refer to S. donianum), velvet nightshade, and salvadora. The potatoes are not the fruits of the trees, they are the leaves.

A note from PlantMom

Potatotree has strong resistance to disease and is usually not susceptible to illnesses. Regarding maintenance, this plant is fairly low-maintenance. When grown outdoors it needs only infrequent watering, and mature specimens typically do not require pruning. Young or smaller plants, however, should be pruned after they finish blooming. Potatotree is appropriate for anyone who has an outdoor area, such as a garden or a deck, and it does not demand extensive gardening experience.

— PlantMom
CARE GUIDE

How to keep Solanum Erianthum.

Light

The Potatotree flourishes with prolonged exposure to light during the day and can moreover adapt to slightly lower light conditions. The presence of sunlight is vital for its healthy evolution, particularly during important growth stages. This plant, stemming from brightly lit environments, modulates its surroundings to suit. Insufficient light can impede growth, while overexposure could lead to harm.

Water

The potato tree, native to regions with fluctuating moisture levels, is highly drought-tolerant and needs watering only every 2-3 weeks. It thrives in subtropical climates and benefits from soil moisture that mimics its natural rainfall patterns.

Temperature

The potatotree is versatile and can tolerate diverse temperatures from 32°F to 100°F (0 to 38℃). Initially, it thrived in its original habitats with chillier temperatures but has proven to adjust well to hotter climates. For the best results, it's advisable to manage the potatotree's temperature in line with changing seasonal temperatures.

Fertilizer

For encouraging healthy development, provide nourishment to your Potatotree during the onset of spring. Periodic fertilization boosts overall wellbeing, leading to robust growth, endurance in harsh environments, and elevated resistance to diseases and pests. Adhere to a precise fertilization timetable for your Potatotree to guarantee vivid leaves with rich color and a full look.

Pruning

For optimal growth and improved air circulation, it's important to prune the potatotree early in the spring by removing dead or crossing branches. Be sure to use sharp and clean tools, and make cuts at a 45-degree angle for the best results. Regular pruning not only helps maintain a healthy structure and encourages flowering but also enhances the plant's aesthetic appeal in the garden.

CHARACTERISTICS

Botanical profile.

Plant Type
Shrub
Life Cycle
Perennial
Genus
Solanum
Family
Solanaceae
Hardiness Zone
2-12
Mature Height
2.13 m to 7.92 m
Mature Spread
2.44 m
Leaf Color
Green, Dark Green
Leaf Type
Semi-evergreen
Flower Color
White
Flower Size
1.02 cm to 1.78 cm
Bloom Time
Late spring, Summer, Early fall, Mid fall
Planting Time
Spring, Summer, Autumn
Harvest Time
Mid summer, Late summer, Fall, Early winter
Native Area
Belize, Honduras, Mexico, Guatemala, Dominican Republic, Nigeria, Trinidad and Tobago, Panama, Jamaica, Colombia, Bahamas, Cuba, Haiti, El Salvador, Nicaragua, Ecuador, Costa Rica
ALSO KNOWN AS

Other names.

en Tobacco-tree en Wild tobacco en Big eggplant en Potato-tree en China flowerleaf en Flannelbush en Mullein Nightshade en Woody nightshade en Wild tobacco tree en Velvet nightshade en Tobacco Nightshade en Common Nightshade
FREQUENTLY ASKED

Reader questions.

What is the most effective way to water my Potatotree?

To ensure excellent root development, it is recommended to place a garden hose at the base of the plant. Avoid spraying the leaves directly, as this can be detrimental. If the plant is outdoors and exposed to direct sunlight, the leaves will require more water. Bubblers can be used to moisten the roots of each plant, while soaker hoses can be employed to cover the entire garden or bed when adding or removing plants to ensure deep root penetration. After watering, drain any excess water and allow the soil to dry before watering again. To prevent diseases, water at ground level. On a sunny day, it might be helpful to spray the entire bush with water. Whether the plant is potted or in-ground, it is important to provide deep watering rather than light sprinkling for Potatotrees.

What are the sunlight requirements for a Potatotree?

The Potatotree requires extensive light exposure throughout the day for healthy development, thriving best in full sun conditions which entail above 6 hours of sunlight daily. It can also adapt to partial sun, defined as about 3-6 hours of sunlight. Originating from well-lit environments, the Potatotree's growth can be hindered by insufficient light, while too much direct exposure may cause damage. It is important to watch how sunlight moves through your garden to find spots that provide the right balance of light and shade.

What is the ideal temperature range for a Potatotree?

The Potatotree (Solanum erianthum) thrives across a wide temperature range of 32 to 100°F (0 to 38°C). Although it originates from cooler climates, it has adapted well to warmer temperatures as well. To keep your Potatotree healthy, it's best to adjust its environment according to the seasonal changes. During the colder months, Potatotree exhibits strong cold resistance, often not requiring special frost protection. However, in regions where winter temperatures plummet below -40°C, it's crucial to insulate the tree by wrapping its trunk and branches with non-woven fabric or cloth. Additionally, make sure to water the plant abundantly before the first freeze of autumn to ensure the soil remains moist and freezes, helping to prevent drought and water scarcity throughout winter and early spring.

What do I need to do if I give Potatotree too much or too little water?

An overwatered Potatotree may exhibit several symptoms, such as yellowing and dropping of leaves, wilting, and a generally dull and unhealthy appearance. Mushy stems are often a clear indication of overwatering. If these signs start to appear, it is advisable to adjust your watering schedule accordingly. On the other hand, wilting can also occur due to under watering. In this case, the leaves may become crispy and dry. To determine the appropriate action, check the soil's moisture level when it is dry. If simply watering is insufficient, provide a full watering in a timely manner. Sufficient water will allow the Potatotree to recover, but the plant may still exhibit dryness and yellowing leaves for a few days due to root damage. Once the plant returns to its normal state, the yellowing of leaves will cease. When growing Potatotrees indoors, always monitor the moisture levels and avoid overwatering, checking for any signs of black spots. If these spots are found, allow the soil in the pot to dry out by refraining from watering for a few days. Overwatering can lead to root rot, so if this occurs and you notice discolored and slimy roots, consider transferring the plant to a different pot. Preventing root rot should always be a priority, ensuring the soil does not become too soggy. When planting Potatotrees outdoors, it is recommended to dig a little deeper and check the moisture level of the soil. If the soil feels excessively dry, this is an indication of under watering. Adequate watering is crucial to help the plant recover.

Can Potatotrees grow under artificial lighting?

Yes, Potatotrees can grow under artificial lighting, especially when natural sunlight is insufficient, such as in winter or less sunny spaces. Artificial lighting, particularly LED lights, provides essential wavelengths for optimal growth. Full sun plants, including Potatotrees, require 30-50W/sq ft of light, and the artificial light source should be placed 12-36 inches above the plant. Mimicking natural daylight hours, most plants will need 8-12 hours of light per day.

How does low temperature affect Potatotree and what measures should be taken?

Potatotree is highly cold-tolerant, preferring temperatures to stay above 0°C and needing precautions when temperatures are expected to drop below -35°C. Under extreme cold below -40°C, the plant itself may not show immediate damage during winter, but come spring, its branches might become brittle and dry, and fail to produce new shoots. To combat this, it's advised to prune away any dead branches in spring that haven't produced new leaves, ensuring the health and growth continuity of the potatotree.

How often do I need to water my Potatotree?

The Potatotree prefers deep and infrequent watering, especially when planted in pots. Water storage in pots is limited, so the soil dries out faster. Cold regions require watering every 3 to 5 days. Water in the morning when the soil is dry, and check the soil's moisture level by feeling the top 2-3 inches. Give the plant a full watering when the soil is dry. On hot days, check the soil daily as it dries out quickly. In gardens, water once a week in hot climates. Only water when the top 2-3 inches of soil are dry. Consider rainfall levels before adding water to prevent root rot. Potatotrees mainly grow in spring and fall. Use 3-4 inches of mulch outdoors to conserve water. Sandy soil requires more frequent watering, while clay soil can go 2-3 days without water to avoid root rot. Mark watering dates on a calendar and watch for drooping leaves as a sign that watering may be needed.

What are the symptoms of inappropriate lighting for a Potatotree?

Potatotrees may show various symptoms when exposed to suboptimal lighting conditions. These include smaller new leaves, leggy or sparse growth, faster leaf drop, slower or halted growth, lighter-colored new leaves, chlorosis, sunscald, leaf curling, wilting, and leaf scorching. Each symptom indicates either a deficiency or excess of light exposure, impacting the plant's health and growth significantly.

What are the effects of high temperature on Potatotree and how can they be mitigated?

In the summer, it's important to keep the Potatotree's environment below 38°C to avoid heat stress. Exposure to temperatures above 43°C can result in the leaves lightening in color and the tips becoming dry and withered. The tree also becomes more prone to sunburn under such conditions. To alleviate these issues, trim away sunburned and dried-up parts of the plant, relocate it to a shaded area during the most intense afternoon sun, or utilize a shade cloth. Additionally, watering the tree in the early morning and evening will help keep the soil adequately moist, preventing further stress.

How much water does my Potatotree need?

The Potatotree generally needs about a gallon of water on a regular basis. If you have potted plants, water them deeply until water starts dripping out of the bottom of the pot. Wait for the soil to dry before watering again. You can use a water calculator or a moisture meter to see how much water you've given your plant in a week. During the flowering period, provide plenty of water but let the moisture evaporate afterwards to avoid root rot. If your Potatotree is planted outdoors and receives enough rainfall, you may not need to water it additionally. However, when the Potatotree is young or newly planted, make sure it gets 1-2 inches of rain per week. Once the Potatotree is fully grown, it can rely solely on natural rainfall. In very hot weather or during extended periods with no rain for 2-3 weeks, consider giving your Potatotree a thorough watering during cooler times of the day to prevent heat damage. Additional watering may be necessary during long dry spells.

How can I address lighting issues for my indoor and outdoor Potatotrees?

To address lighting issues, gradually adjust your Potatotree's exposure to sunlight. For indoor plants, move them to a sunnier location each week until they receive at least 6 hours of direct sunlight daily, utilizing a south-facing window. If moving the plant is impractical, consider artificial lighting, keeping lamps on for at least 8 hours a day. Outdoor plants should similarly be moved gradually to sunnier spots to prevent sunburn. In cases where sunlight is blocked by obstructions like trees, consider pruning to improve light penetration or transplanting smaller plants to sunnier locations during their dormant periods for improved health and growth.

Should I change how often I water my Potatotree depending on the time of year or the weather conditions?

The Potatotree primarily relies on rain for its watering needs, except during persistent dry weather when additional watering may be required. During spring and fall, it is important to keep the soil consistently moist, but not overly soggy. Alternating between dry and moist soil conditions encourages healthy growth. In the summer, hot weather can cause water to evaporate quickly, so extra watering may be necessary if there is a lack of rainfall. However, during winter, the Potatotree typically requires less water as it goes dormant and loses its leaves. To promote quicker water evaporation, using a well-draining soil mixture like terracotta can be beneficial. Once the Potatotree starts to leaf out and go dormant in the spring, it generally relies on fall and winter rains to survive without additional watering. When flowering, it is important to avoid ponding or drought conditions, so ensuring good drainage is crucial, especially during winter. In pots, the Potatotree has limited root growth, so it should be well-watered, particularly in summer. Deep soaking the entire root system once or twice a week, depending on the weather, is recommended. Shallow sprinkles that only reach the leaves should be avoided, as they can promote fungal growth and do not reach the roots effectively. Even during dormancy in fall or winter, the Potatotree should not be allowed to dry out completely. However, overwatering should also be avoided, as sitting in water for too long can be detrimental, especially in winter. Applying mulch whenever possible can help reduce stress, conserve water, and encourage healthy blooming.

PLATES
Solanum erianthum leaf
PLATE 01 · leaf
Solanum erianthum leaf
PLATE 02 · leaf
Solanum erianthum flower
PLATE 03 · flower
Solanum erianthum flower
PLATE 04 · flower
Solanum erianthum fruit
PLATE 05 · fruit
Solanum erianthum fruit
PLATE 06 · fruit
ALSO IN THE LIBRARY

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