Caper
Capparis spinosa
Capparis spinosa, commonly known as the caper bush, is a hardy perennial native to the Mediterranean region. Renowned for its edible flower buds, capers, this plant is cherished for its unique culinary uses and aromatic foliage. With proper care, it can thrive in gardens and containers, adding both beauty and flavor.
Everything it needs
9 essentials at a glance
Watering
Caper bushes prefer well-drained soil and should be watered deeply but infrequently.
Water every 2-3 weeks during the growing season, allowing the top inch of soil to dry out between waterings. In winter, reduce watering to once a month. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause wilting and leaf drop.
Light
Caper bushes thrive in full sun, requiring at least 6-8 hours of direct sunlight daily.
Ideal placement is in a south-facing garden bed or container that receives ample sunlight. They can tolerate some light shade but will not flower as profusely in lower light conditions.
Soil
The ideal soil for Capparis spinosa is sandy or rocky with excellent drainage, with a pH range of 6.0 to 8.0.
A recommended potting mix includes a blend of cactus mix and perlite to enhance drainage. Avoid heavy clay soils that retain moisture.
Humidity
Caper bushes prefer low to moderate humidity levels, ideally around 30-50%.
To increase humidity, mist the leaves occasionally or place a humidity tray nearby. Signs of humidity stress include browning leaf tips and curling leaves.
Temperature
Caper bushes thrive in temperatures between 70-85°F (21-29°C) and can tolerate temperatures as low as 20°F (-6°C) in hardiness zones 8-11.
They are sensitive to frost, so protection is necessary in colder climates. During summer, they can handle higher temperatures but may require more water.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10, applying it every 6-8 weeks during the growing season.
In fall and winter, refrain from fertilizing. Signs of nutrient deficiency include stunted growth and yellowing leaves, indicating a need for more nutrients.
Pruning
Prune caper bushes in late winter or early spring to remove dead or damaged branches and to shape the plant.
Use sharp, clean pruning shears to make clean cuts. Deadheading spent flowers can encourage more blooms throughout the growing season.
Repotting
Repot caper bushes every 2-3 years or when they outgrow their container.
Choose a pot that is 1-2 inches larger in diameter. Signs that repotting is needed include roots growing out of the drainage holes and stunted growth. When repotting, gently remove the plant from its pot, trim any damaged roots, and place it in fresh potting mix.
Propagation
Caper bushes can be propagated through stem cuttings or seeds.
For stem cuttings, take 4-6 inch cuttings in late spring, dip them in rooting hormone, and plant them in a well-draining mix. Keep the cuttings moist and in a warm location until roots develop. For seeds, soak them in water for 24 hours before planting in spring.
When it's unhappy
Yellow leaves
Why it happens
Over-watering or nutrient deficiency
How to fix it
Ensure proper drainage and reduce watering frequency. Consider fertilizing if nutrient deficiency is suspected.
Wilting leaves
Why it happens
Under-watering or extreme heat
How to fix it
Increase watering frequency and ensure the plant is not exposed to excessive heat without adequate moisture.
Root rot
Why it happens
Poor drainage and over-watering
How to fix it
Improve soil drainage and reduce watering. If root rot is severe, consider repotting into fresh, dry soil.
Pests (aphids, spider mites)
Why it happens
Dry conditions or overcrowding
How to fix it
Regularly inspect the plant and treat infestations with insecticidal soap or neem oil. Increase humidity to deter pests.
Poor flowering
Why it happens
Insufficient sunlight or nutrients
How to fix it
Ensure the plant receives full sun and consider fertilizing to encourage blooming.
Care through the year
Spring
In spring, prune any dead or damaged branches and begin regular watering as the plant comes out of dormancy. Fertilize every 6-8 weeks.
Summer
During summer, ensure the plant receives adequate water, especially in hot weather. Monitor for pests and continue fertilizing.
Fall
In fall, reduce watering as the plant prepares for dormancy. Stop fertilizing and consider mulching to protect roots from cold.
Winter
In winter, water sparingly, only once a month, and protect the plant from frost. If grown in a container, consider bringing it indoors.
Toxicity & Safety
Caper bushes are generally considered non-toxic to pets and children. However, the unripe fruit and seeds can be toxic if ingested in large quantities, potentially causing gastrointestinal upset.
Good to know
How often should I water my caper bush?
Water your caper bush every 2-3 weeks during the growing season, allowing the top inch of soil to dry out between waterings.
What type of soil is best for caper bushes?
Caper bushes prefer sandy or rocky soil with excellent drainage and a pH range of 6.0 to 8.0. A cactus mix with perlite is ideal.
Why are my caper bush leaves turning yellow?
Yellow leaves can indicate over-watering or a nutrient deficiency. Check soil moisture and consider fertilizing if needed.
Can I grow capers in a container?
Yes, caper bushes can thrive in containers as long as they have well-draining soil and receive plenty of sunlight.
How do I propagate caper bushes?
Caper bushes can be propagated through stem cuttings or seeds. For cuttings, take 4-6 inch pieces in spring and root them in a well-draining mix.
What pests affect caper bushes?
Common pests include aphids and spider mites. Regular inspection and treatment with insecticidal soap can help manage these pests.
When should I prune my caper bush?
Prune caper bushes in late winter or early spring to remove dead branches and encourage new growth.
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