Grewia occidentalis — an easy houseplant, prefers full sun light
SPECIMEN · FROM THE LIBRARY
Grewia occidentalis

Grewia Occidentalis

Updated · 248 observations
ON THIS PLANT

Grewia occidentalis, commonly known as Crossberry or Four-cornered Berry, is a small to medium-sized shrub belonging to the Malvaceae family. Native to southern Africa, this plant thrives in a variety of habitats, including forests, savannas, and grasslands.

The shrub features a multi-stemmed growth habit with an upright form, reaching heights of up to 3 meters. Its leaves are simple, alternate, and oval-shaped with serrated edges. The flowers, which vary in color from white to pinkish-purple, are small and have five petals.

The fruit of Grewia occidentalis is a four-lobed berry that transitions from greenish-yellow when unripe to reddish-brown when mature. It has a sweet taste and is edible for both humans and animals.

Traditionally, Grewia occidentalis has been used for its medicinal properties, particularly for treating diarrhea, dysentery, coughs, colds, fever, headaches, and other ailments, owing to its anti-inflammatory properties.

Overall, Grewia occidentalis plays a significant role in southern Africa's ecosystem. It provides food for animals and holds medicinal value for humans, underscoring its ecological and cultural importance.

A note from PlantMom

Crossberry shows good resistance to disease and is generally not prone to illnesses. Regarding care, this plant is fairly low-maintenance. When grown outdoors it needs minimal watering, and larger plants usually do not require pruning. Smaller plants, however, should be pruned after they have finished blooming. Crossberryt is appropriate for anyone with an outdoor area, such as a garden or deck, and does not demand much gardening experience.

— PlantMom
CARE GUIDE

How to keep Grewia Occidentalis.

Light

Crossberry requires ample sunlight for optimal growth, similar to its native habitat. Throughout its growth stages, abundant but mild light encourages balanced development. However, prolonged periods of intense sunlight can be damaging, and too little light likewise inhibits growth and vigor.

Water

Crossberry thrives in semi-arid regions, where it benefits from infrequent but deep watering every 1 to 2 weeks. It's important to let the soil dry out between watering sessions. Typically grown outdoors, Crossberry requires full sun and displays impressive drought tolerance. As an evergreen plant, it efficiently maintains hydration across a range of climates.

Humidity

This plant will thrive in moderate humidity, which is probably the level in your home. However, misting it a few times a week can be very beneficial. Make sure the room has good ventilation.

Temperature

Crossberry originates from temperate regions and is adapted to a preferred temperature range of 68 to 100 °F (20 to 38 ℃). For optimal growth, keep the temperature within this range, particularly during seasonal transitions.

Fertilizer

The best time to fertilize a Crossberry is in early spring when it comes out of dormancy. This promotes overall growth and supports flower development. Fertilization improves the foliage, stems, and branches, and encourages large, vibrant, long-lasting flowers. It also helps move nutrients from the roots to the flowers and enhances the plant's health and resistance to disease.

Pruning

The evergreen shrub known as the crossberry benefits greatly from regular pruning during its dormant period, which occurs from early to late winter. To enhance airflow, flowering, and overall plant health, remove any dead or crossing branches. Be sure to use clean, sharp tools to minimize damage and reduce the risk of disease.

Pot & Repot

Repot crossberry every 2 to 3 years during the spring. Use a container that is 2 to 3 inches wider than the root ball. After repotting, place it in indirect light and keep the soil moist to help it recover and encourage blooming.

CHARACTERISTICS

Botanical profile.

Plant Type
Tree, Shrub
Life Cycle
Perennial
Genus
Grewia
Family
Malvaceae
Hardiness Zone
9-11
Mature Height
3.96 m
Mature Spread
2.44 m
Leaf Color
Green
Leaf Type
Evergreen
Flower Color
Lavender
Flower Size
2.54 cm to 5.08 cm
Bloom Time
Late spring, Summer, Early fall
Planting Time
Spring
Harvest Time
Late summer, Fall
Native Area
Saudi Arabia, Lesotho, Mozambique, South Africa, Eswatini, Zimbabwe
ALSO KNOWN AS

Other names.

en Crossberry en Lavender starflower en Four-corners en Starflower
FREQUENTLY ASKED

Reader questions.

How should I water my Crossberry plant?

Your Crossberry plant is not picky about how you water it. You can use common watering tools like watering cans, hoses, or cups. When watering the plant, it's important to apply the water directly to the soil and make sure all areas of the soil are moistened evenly to provide water to the entire root system. It's recommended to use filtered water instead of tap water, as tap water may contain harmful particles. Additionally, using water at or slightly above room temperature is beneficial, as extremely cold or hot water can shock the plant. However, the Crossberry plant usually responds well to any type of water you give it.

Why should I put fertilizer on my Crossberry plant?

Fertilization plays a crucial role in the overall health and well-being of a Crossberry plant. By providing the necessary energy and nutrients, it promotes the growth of healthy foliage, sturdy stems, and branches. One of the main benefits of fertilization is its impact on the flowers of the Crossberry, which are highly valued by gardeners. The right fertilizer results in larger, more vibrant, and longer-lasting flowers. This is because it facilitates the transfer of fuel from the plant's roots to its flowers through the stems. Additionally, proper fertilization helps maintain the plant's overall health, enhancing its ability to resist diseases.

What are the sunlight requirements for Crossberry plants?

Crossberry plants enjoy full sun, which is above 6 hours of sunlight daily, but can also thrive in partial sun, receiving about 3-6 hours of sunlight. It's crucial to observe how sunlight moves through your garden to ensure that you place your plants in spots that offer the right balance of light and shade, contributing to their overall happiness and growth.

What is the native climate for Crossberry plants?

Crossberry, also known as Grewia occidentalis, is native to regions that have a temperate climate. It is well-suited for temperatures ranging from 68 to 100 °F (20 to 38 °C). To ensure optimal growth, maintaining this temperature range is crucial, especially during the changing seasons. Crossberry plants are extremely heat-loving, and exposure to cold temperatures can be harmful to them.

What do I do if I give my Crossberry plant too much or too little water?

Outdoor plants, particularly newly planted plants or seedlings, are prone to lack of watering. It's important to remember to water them consistently for the first few months while they are still small or newly planted. Once their roots are established, Crossberry plants can rely on rain for most of their water needs. When planting Crossberry in pots, overwatering is more likely. If you accidentally overwater your Crossberry, you should take immediate action to fix the situation. Firstly, stop watering the plant to minimize the negative effects. Next, remove the Crossberry from its pot and inspect the roots. If there are no signs of root rot, you can return the plant to its container. However, if root rot is present, trim away the affected roots and consider applying a fungicide to prevent further damage. Lastly, repot the Crossberry in well-draining soil. In the case of underwatering, simply increase the frequency of watering. Underwatering is usually easy to correct, as the plant's leaves will droop, dry out, and may fall off. After sufficient watering, the leaves will quickly regain their fullness. It's important to adjust your watering schedule as soon as you notice underwatering occurring.

When should I fertilize my Crossberry plant?

The best time to fertilize a Crossberry plant is in early spring when it is coming out of dormancy and getting ready to bloom. This will provide the plant with energy for growth and flower development. However, it's also beneficial to fertilize it again in the fall, although a smaller amount is sufficient. Some gardeners prefer to fertilize when planting, but it's not always necessary.

How important is sunlight for the growth of Crossberry plants?

Sunlight plays a pivotal role in the growth and development of Crossberry plants. These plants crave extensive solar exposure for optimal growth, mirroring their native habitat conditions. At different growth stages, ample yet gentle sunlight encourages a well-rounded development. Too much intense sunlight or insufficient light can negatively impact the plant's growth, vitality, and ability to produce flowers or fruit.

What should I do with my Crossberry plant in autumn and winter to protect it from cold?

In autumn, it is advisable to bring Crossberry plants indoors if they have been grown outside, placing them near a bright window to ensure they continue to receive sufficient light. However, they should be kept at a safe distance from heaters to avoid damage. During winter, maintaining temperatures above 20°C is beneficial for the plant’s growth, as temperatures approaching 0°C or lower can be detrimental. Keeping the plant in a warm environment is key to protecting it from cold-related harm.

How frequently should I water my Crossberry plant?

Most outdoor plants can grow naturally with rainfall, but if there is a lack of rainfall in your area, you should water your plants every 2 weeks during the spring and fall. In the summer, more frequent watering is required, while in the winter, when growth is slower, you can water less frequently. In fact, during the winter, you may not need to water your plants at all. However, if your Crossberry is young or newly planted, it needs more regular watering to establish and grow into adaptable and drought-tolerant plants. For potted Crossberry plants, there are two main ways to determine the watering frequency. The first way is to stick to a set watering schedule, such as once every week or once every other week. However, this may not always work well as it doesn't consider the specific conditions of your Crossberry's environment. Watering frequency can also change depending on the season. For example, during summer, when the plant's water needs are highest, a predetermined schedule may not be sufficient. An alternative approach is to water based on soil moisture. It is generally best to wait until the top two to four inches of soil (about ⅓ to ½ depth of the pot) have completely dried out before watering again.

When is the best time to not put fertilizer on my Crossberry plant?

During the winter, Crossberries, like many other plants, do not require fertilization. They are in a dormant phase and do not need much energy from the soil for new growth. Fertilizing them during winter increases the risk of overfertilization. The best time to feed a Crossberry is in early spring and fall. Therefore, for most of the spring and summer, fertilizer is not needed. Additionally, it is advisable to refrain from feeding if the plant is subjected to excessively hot or dry conditions.

Can artificial lighting be used for Crossberry plants? How?

Yes, artificial lighting can be a vital solution for Crossberry plants, especially when natural sunlight is insufficient, such as during winter or in less sunny indoor spaces. Adequate lighting promotes faster and healthier growth. LED lights are preferred for their ability to provide specific wavelengths of light needed by plants. Full sun plants require 30-50W/sq ft, partial sun plants need 20-30W/sq ft, and full shade plants 10-20W/sq ft of artificial light. The light source should be placed 12-36 inches above the plant, mimicking natural sunlight for about 8-12 hours per day.

How does low temperature affect Crossberry plants, and what are the solutions?

Crossberry plants prefer warm temperatures and do not tolerate low temperatures well, thriving best when the temperature is above 20°C. During winter, they should be kept in conditions above 0°C. Exposure to temperatures below -5°C can cause the leaves to lighten in color, and if the plant experiences frost damage, the leaves may eventually turn brown or black. Symptoms such as wilting and drooping can also occur. To remedy frost damage, you should trim off the frost-damaged parts and move the plant to a warmer indoor spot, preferably near a south-facing window for adequate sunlight. Avoid placing the plant near heaters or air conditioning vents as this can cause the air around the plant to become excessively dry.

PLATES
Grewia occidentalis leaf
PLATE 01 · leaf
Grewia occidentalis leaf
PLATE 02 · leaf
Grewia occidentalis flower
PLATE 03 · flower
Grewia occidentalis flower
PLATE 04 · flower
Grewia occidentalis fruit
PLATE 05 · fruit
Grewia occidentalis bark
PLATE 06 · bark
ALSO IN THE LIBRARY

You might also like.