African Horned Cucumber
Cucumis metuliferusUSDA | Grow Zone
9-11Outdoors all year in zones 9 to 11. Anywhere colder, keep it as a houseplant. Protect it below 40°F.
- Light
- Full sun, 6-8 hours
- Water
- Keep soil consistently moist
- Humidity
- 50-70% humidity
- Temperature
- 70-85°F (21-29°C)
- Difficulty
- Intermediate
- Growth
- Moderate
- Mature size
- 3-5 ft tall, 2-3 ft wide
- Pets
- Non-toxic to pets and children
The African Horned Cucumber, also known as kiwano, is a unique fruit native to Africa, prized for its spiky appearance and refreshing taste. This exotic plant is not only visually striking but also offers a deliciously sweet and tangy flavor, making it a favorite among adventurous gardeners.
Ask Vesper about African Horned Cucumber
Ideal temperature
70-85°F is where it grows fastest. Below 40°F cold damage starts.
Spacing and harvest
- Mature size
- 3-5 ft tall, 2-3 ft wide
- Plant apart
- 12-24 in
- Frost
- Tender: no frost
- First harvest
- 60-90 days from planting
Everything it needs
9 essentials at a glance
Watering
Water the African Horned Cucumber regularly, ensuring the soil remains consistently moist but not soggy.
During the growing season (spring and summer), water deeply once a week, adjusting frequency based on rainfall and temperature. In cooler months, reduce watering to every 10-14 days. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause wilting and dry leaf edges.
Light
This plant thrives in full sun, requiring at least 6-8 hours of direct sunlight daily.
Ideal placement is in a sunny garden bed or container that receives ample light throughout the day. While it can tolerate partial shade, reduced light may hinder fruit production and growth.
Soil
The African Horned Cucumber prefers well-draining, sandy loam soil with a pH range of 6.0 to 7.0.
Good drainage is crucial to prevent root rot, so consider mixing in organic matter or perlite to enhance soil structure. A recommended potting mix would be a blend of potting soil, compost, and sand.
Humidity
This plant enjoys moderate humidity levels around 50-70%.
To increase humidity, mist the leaves regularly or place a humidifier nearby. Conversely, if humidity is too high, ensure good air circulation to prevent fungal diseases. Signs of humidity stress include browning leaf tips and wilting.
Temperature
The ideal temperature range for the African Horned Cucumber is 70-85°F (21-29°C).
It is best suited for USDA hardiness zones 9-11. While it can tolerate brief periods of heat, prolonged exposure to temperatures above 90°F (32°C) may stress the plant. Protect from frost, as it is sensitive to cold.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10 every 4-6 weeks during the growing season.
Reduce fertilization in the fall and winter months. Signs of nutrient deficiency include yellowing leaves (nitrogen deficiency) and poor fruit development (potassium deficiency).
Pruning
Prune the African Horned Cucumber to encourage bushier growth and better air circulation.
Use clean, sharp pruning shears to remove any dead or yellowing leaves. Prune in early spring and again during the growing season as needed to maintain shape and health.
Repotting
Repot the African Horned Cucumber every 1-2 years or when it outgrows its current container.
Choose a pot that is 1-2 inches larger in diameter. Signs it needs repotting include roots growing out of the drainage holes and stunted growth. To repot, gently remove the plant from its pot, loosen the roots, and place it in fresh potting mix.
Propagation
Propagation can be achieved through seeds or seedlings.
For seed propagation, plant seeds 1 inch deep in warm soil after the last frost. Keep the soil moist until germination, which usually takes 7-14 days. For seedlings, transplant them outdoors after they have developed a few true leaves and the risk of frost has passed.
When it's unhappy
Yellow leaves
Why it happens
Typically caused by over-watering or nutrient deficiency.
How to fix it
Check soil moisture levels and adjust watering frequency. Fertilize with a balanced fertilizer if nutrient deficiency is suspected.
Root rot
Why it happens
Over-watering or poor drainage.
How to fix it
Ensure the pot has adequate drainage holes and reduce watering frequency. If root rot is severe, consider repotting with fresh soil.
Powdery mildew
Why it happens
High humidity and poor air circulation.
How to fix it
Improve air circulation around the plant and apply a fungicide if necessary. Avoid overhead watering to reduce humidity on the leaves.
Wilting
Why it happens
Under-watering or extreme heat.
How to fix it
Check soil moisture and water deeply if dry. Provide shade during extreme heat to reduce stress on the plant.
Poor fruit development
Why it happens
Insufficient pollination or nutrient deficiency.
How to fix it
Encourage pollinators by planting nearby flowers and ensure proper fertilization during the growing season.
Care through the year
Spring
In spring, focus on fertilizing and watering as the plant begins to grow. Ensure it receives plenty of sunlight and consider starting seeds indoors if planting early.
Summer
During summer, maintain consistent watering and monitor for pests. Provide support for climbing if grown vertically and ensure adequate pollination.
Fall
In fall, reduce watering as temperatures drop and prepare for potential frost. Harvest fruits before the first frost and consider bringing potted plants indoors.
Winter
In winter, limit watering and provide a cool, bright location if indoors. Protect outdoor plants from frost and cold temperatures.
Toxicity & Safety
The African Horned Cucumber is considered non-toxic to pets and children. However, ingestion of large quantities may cause mild gastrointestinal discomfort. It is always best to keep plants out of reach of curious pets and children.
Good to know
How often should I water my African Horned Cucumber?
Water your African Horned Cucumber once a week during the growing season, ensuring the soil remains moist but not soggy. Adjust frequency based on rainfall and temperature.
What type of soil is best for African Horned Cucumber?
This plant prefers well-draining sandy loam soil with a pH of 6.0 to 7.0. Mixing in organic matter can enhance drainage and nutrient availability.
Why are my African Horned Cucumber leaves turning yellow?
Yellow leaves can indicate over-watering or nutrient deficiency. Check soil moisture and consider fertilizing if nutrient levels are low.
How can I increase humidity for my African Horned Cucumber?
To increase humidity, mist the leaves regularly or use a humidifier nearby. Placing a tray of water with pebbles under the pot can also help.
When should I prune my African Horned Cucumber?
Prune in early spring and during the growing season as needed to remove dead or yellowing leaves and to encourage bushier growth.
What are the signs of root rot in African Horned Cucumber?
Signs of root rot include yellowing leaves, wilting, and a foul smell from the soil. Ensure proper drainage and adjust watering practices to prevent this issue.
Can I grow African Horned Cucumber in a container?
Yes, African Horned Cucumbers can be successfully grown in containers. Ensure the pot is at least 12 inches deep and has drainage holes for best results.
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