Alternanthera sessilis — a medium houseplant, prefers full sun light
SPECIMEN · FROM THE LIBRARY
Alternanthera sessilis

Alternanthera Sessilis

Updated · 445 observations
ON THIS PLANT

Alternanthera sessilis is a flowering plant known by several common names, including sissoo spinach, Brazilian spinach, sessile joyweed and dwarf copperleaf. It is cultivated as a vegetable worldwide.

A note from PlantMom

Sessile Joyweed shows moderate resistance to disease but can be prone to problems like leaf spot. Its susceptibility to insect pests differs by cultivar, though most have lower resistance to pests. For care, Sessile Joyweed needs consistent watering and fertilization and frequent removal of yellow leaves. It’s important to manage pests and diseases as they appear and to harvest the plant promptly. Sessile Joyweed is suited to people who can devote some time and effort to regular upkeep.

— PlantMom
CARE GUIDE

How to keep Alternanthera Sessilis.

Light

Sessile Joyweed grows best with strong sunlight throughout the day. While it can still grow in light shade, its growth and health may be impaired. Both too much and too little sun can negatively affect the plant, since it originates from areas that receive regular sunshine.

Water

Sessile Joyweed thrives in moist, humid environments and can tolerate some drought. It grows best with consistent soil moisture, ideally needing weekly watering. While it benefits from natural rainfall, it performs optimally outdoors during the growing season when the soil is kept damp but not waterlogged.

Temperature

Sessile Joyweed comes from temperate environments and prefers temperatures of 68 to 95°F (20 to 35℃). Depending on the season, it may be necessary to regulate temperature to replicate those conditions.

Fertilizer

To maximize yield, Sessile Joyweed benefits from regular applications of a balanced fertilizer, especially one high in nitrogen. Apply fertilizer before planting, at planting, and again when seedlings are 2 inches tall. Adding compost or manure also gives a steady nutrient supply. Too few nutrients in the soil lead to underdeveloped leaves and stems, thin stems, inferior flavors, and a potentially bitter taste.

Pruning

Sessile Joyweed benefits from regular pruning, particularly from early to late spring. This practice encourages bushier growth and enhances air circulation. Make sure to trim any dead or damaged stems and thin out overly dense areas to support plant health and reduce pests. These recommendations are supported by horticultural guides and extension programs.

CHARACTERISTICS

Botanical profile.

Plant Type
Herb
Life Cycle
Annual, Perennial
Genus
Alternanthera
Family
Amaranthaceae
Hardiness Zone
10
Mature Height
30 cm to 91 cm
Mature Spread
91 cm
Leaf Color
Green, Dark Green
Leaf Type
Evergreen
Flower Color
White
Flower Size
0.25 cm to 0.51 cm
Bloom Time
Summer, Fall
Planting Time
Spring, Autumn
Harvest Time
Late summer, Fall, Early winter
Native Area
Burkina Faso, Sri Lanka, Belize, Mexico, Guatemala, Madagascar, Pakistan, Dominican Republic, Nigeria, Guinea-Bissau, Uganda, Tanzania, Benin, Paraguay, Sierra Leone, Indonesia, Haiti, Cameroon, Mozambique, Ethiopia, Suriname, Central African Republic, Saudi Arabia, Malawi, Tunisia, Honduras, Peru, Philippines, Bangladesh, Panama, Chad, China, Colombia, Lebanon, Syria, Japan, Togo, El Salvador, Senegal, Eswatini, Iran, Côte d'Ivoire, Gambia, Costa Rica, Congo (DRC), Lesotho, Egypt, Angola, Malaysia, Eritrea, Yemen, Kenya, Niger, Jamaica, Zimbabwe, Mali, Iraq, Cuba, Cambodia, Liberia, Venezuela, Brazil, Ghana, Botswana, Congo, Nepal, South Africa, Sudan, Mauritania, Zambia, Guinea, Bolivia, Vietnam, Myanmar, Guyana, Bhutan, Nicaragua, Algeria, Thailand, Gabon
ALSO KNOWN AS

Other names.

en Sessile joyweed en Amaranthus weed en Rabbit-meat en Dwarf Copperleaf en Sessile alligator weed en Sessile-flower globe amaranth en Red sessile joyweed en Ponnangani keerei - Tamil en মাটিকাদুৰী
FREQUENTLY ASKED

Reader questions.

How should I water my Sessile Joyweed plant?

To water Sessile Joyweed, you have several options. You can use a garden hose with a spray nozzle, a watering can, or any other common watering tool. This plant is not particularly picky about the type of water it receives - rainwater, tap water, or filtered water all work fine. However, it's best to avoid watering from overhead as this can harm the leaves and flowers and may even cause disease. For optimal watering, consider setting up a drip irrigation system. This method evenly and directly applies water to the soil, which works well for Sessile Joyweed. If you have a container-grown Sessile Joyweed, you can follow a similar watering approach, just changing the tools you use. Simply use a cup, watering can, or tap to apply water directly to the soil.

Why should I put fertilizer on my Sessile Joyweed?

Plants require nutrients to grow, but some, like Sessile Joyweed, can obtain what they need without additional fertilizers. Like other plants, Sessile Joyweed uses nutrients for growth and internal processes. Nitrogen, phosphorus, and potassium are the main nutrients that support various essential functions in plants. Specifically, nitrogen is crucial for foliage growth. However, Sessile Joyweed may struggle to acquire enough nitrogen from the soil, so many gardeners opt to supplement the plant with a nitrogen source.

What are the sunlight requirements for Sessile Joyweed?

Sessile Joyweed thrives under robust sun exposure, requiring full sun for more than 6 hours of sunlight daily, or partial sun for about 3-6 hours of sunlight. It's highly recommended to observe the movement of sunlight through your garden to locate the ideal spots that offer the right balance of light and shade for your plants, ensuring they remain healthy and happy.

What is the native environment of Sessile Joyweed?

Sessile Joyweed, or Alternanthera sessilis, thrives in temperate environments. It prefers temperatures ranging between 68 to 95°F (20 to 35°C). Given its preference for warmth, it requires temperature regulation depending on the season to mimic these ideal conditions.

What should I do if I give my Sessile Joyweed too much or too little water?

The solution to underwatering Sessile Joyweed is clear - if you notice your plant is lacking moisture, simply water it more regularly. Overwatering, on the other hand, can be a more serious problem if not recognized early. It can cause diseases that lead to the decline and death of the plant. To prevent this, it is important to choose a suitable growing location that receives enough sunlight to dry the soil and has good drainage to avoid waterlogged soil. If you overwater Sessile Joyweed in a pot, it may be necessary to transfer it to a new pot. The previous container may not have had proper soil drainage or enough drainage holes. When repotting the overwatered plant, use loose soil and a pot that drains efficiently.

When should I fertilize my Sessile Joyweed for the best results?

Sessile Joyweed typically grows well, but it can benefit from monthly fertilization during periods of active growth. Fertilizing should only be done in the spring and summer months, as the plant requires fewer nutrients in the fall and winter. Look for signs of new growth as an indicator of when to begin fertilizing. Whether the plant is grown indoors or outdoors in a container, the fertilization schedule remains the same. However, if the Sessile Joyweed is in a container, it may not require fertilization for the first one to two months. This is because the potting soil for containers usually contains enough nutrients initially. Once the plant has been in the same soil for some time, then you can start fertilizing.

How does sunlight exposure affect Sessile Joyweed?

Sunlight exposure plays a crucial role in the growth and health of Sessile Joyweed. While it flourishes under full sun exposure, it can still grow in slightly shaded areas, though its health might be compromised. Both excessive and insufficient sun exposure can negatively impact the plant, as it is naturally accustomed to environments where sunlight is abundant.

How should Sessile Joyweed be cared for in colder temperatures?

Sessile Joyweed is not tolerant of cold temperatures, as it is a heat-loving plant. During autumn, it's advised to bring outdoor-grown Sessile Joyweed indoors, placing it near a bright window to continue receiving light. However, it should not be placed too close to heaters to avoid harm. To promote growth, maintaining temperatures above 20°C during winter is crucial, while ensuring it does not get exposed to temperatures nearing 5°C to prevent damage.

How frequently do I need to water my Sessile Joyweed plant?

Sessile Joyweed requires regular watering throughout the growing season. In the spring, watering once a week is sufficient. However, as the season progresses and temperatures rise, you may need to increase watering to two or three times a week. It is important not to exceed this rate as it can harm the plant. Additionally, it is essential to maintain moist soil for Sessile Joyweed, but avoid making it too wet, regardless of the watering frequency. Watering Sessile Joyweed in a pot is slightly different. Potted plants tend to dry out faster, so watering should be increased to a few times per week, compared to just once per week for plants in the ground.

When is it not a good idea to fertilize my Sessile Joyweed?

To ensure optimal growth of your Sessile Joyweed, avoid fertilizing it when it's unhealthy due to disease or pests. Additionally, refrain from fertilizing a dehydrated plant, as it can exacerbate the issue. Only fertilize plants in good health. When watering, be cautious not to splash fertilizer onto the leaves or stem, as this can cause damage. Unless you are using a specific foliage fertilizer, prevent direct contact between the plant and fertilizer.

What should I do if natural sunlight is insufficient for my indoor Sessile Joyweed?

When natural sunlight is insufficient, especially during the winter or in less sunny spaces, artificial lighting can be a vital solution for indoor Sessile Joyweed. LED lights are a popular choice because they can be customized to provide specific wavelengths needed by your plants. Full sun plants require 30-50W/sq ft of light, partial sun plants need 20-30W/sq ft, and shade plants need 10-20W/sq ft. The light should be placed 12-36 inches above the plant, and you should mimic natural daylight hours, typically providing 8-12 hours of light per day.

What are the symptoms of Sessile Joyweed being exposed to low temperatures?

Exposure to low temperatures can be problematic for Sessile Joyweed, which fares best in warmth. Symptoms of such exposure include a lightening of the leaves' color when temperatures drop below 1°C, progressing to brown or black as frost damage worsens. This may also lead to wilting and drooping. It's crucial to keep the plant above 5°C during winter and ideally above 20°C.

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

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