Pelargonium crispum
Pelargonium crispum
Pelargonium crispum, commonly known as the lemon-scented geranium, is cherished for its aromatic foliage and vibrant blooms. Native to South Africa, this plant is popular in gardens and containers for its delightful scent and resilience. Its easy care makes it a favorite among both novice and experienced gardeners.
Everything it needs
9 essentials at a glance
Watering
Pelargonium crispum prefers to dry out between waterings.
Water thoroughly when the top inch of soil feels dry, typically every 1-2 weeks depending on humidity and temperature. In the growing season, increase frequency, while in winter, reduce to once every 2-3 weeks. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause wilting and leaf drop.
Light
This plant thrives in full sun, requiring at least 6 hours of direct sunlight daily.
Ideal placement is near south-facing windows or outdoors in bright locations. It can tolerate partial shade but may not flower as profusely. Ensure it receives morning sun with some afternoon shade in extremely hot climates.
Soil
Pelargonium crispum prefers well-draining soil with a pH range of 6.0 to 7.0.
A mix of potting soil, perlite, and sand works well to ensure proper drainage. Avoid heavy soils that retain moisture, as this can lead to root rot.
Humidity
This plant prefers moderate humidity levels around 40-60%.
To increase humidity, mist the leaves or use a humidity tray with pebbles and water. If humidity is too low, leaves may curl or become crispy, indicating stress.
Temperature
Pelargonium crispum thrives in temperatures between 65-75°F (18-24°C) and is hardy in zones 9-11.
It can tolerate brief periods of heat up to 85°F (29°C) but should be protected from frost, as it is not cold-hardy.
Fertilizing
Use a balanced liquid fertilizer with an NPK ratio of 10-10-10 every 4-6 weeks during the growing season.
In fall and winter, reduce feeding to once every 8 weeks. Signs of nutrient deficiency include yellowing leaves, poor growth, and lack of blooms.
Pruning
Prune Pelargonium crispum in early spring to encourage bushier growth and remove any dead or damaged leaves.
Use clean, sharp scissors or pruning shears. Deadheading spent flowers will promote further blooming and maintain a tidy appearance.
Repotting
Repot every 1-2 years or when the roots outgrow the pot, typically when roots are visible at the drainage holes.
Choose a pot 1-2 inches larger in diameter. Signs it needs repotting include stunted growth and roots growing out of the pot. To repot, gently remove the plant from its pot, loosen the roots, and place it in fresh soil.
Propagation
Propagation can be done through stem cuttings, division, or seeds.
For stem cuttings, take 4-6 inch cuttings from healthy stems, remove lower leaves, and allow to dry for a few hours. Place in a well-draining potting mix, water lightly, and cover with a plastic bag to maintain humidity. Roots should develop in 2-4 weeks. Best timing is in spring or early summer.
When it's unhappy
Yellow leaves
Why it happens
Often caused by over-watering or poor drainage.
How to fix it
Ensure the pot has drainage holes, reduce watering frequency, and check for root rot.
Wilting leaves
Why it happens
Typically a sign of under-watering or extreme heat.
How to fix it
Water the plant thoroughly and ensure it is not exposed to excessive heat.
Leaf drop
Why it happens
Can occur due to sudden temperature changes or over-watering.
How to fix it
Maintain consistent temperatures and adjust watering habits.
Pest infestations (aphids, spider mites)
Why it happens
Pests are attracted to stressed plants or low humidity.
How to fix it
Regularly inspect the plant, and treat infestations with insecticidal soap or neem oil.
Poor flowering
Why it happens
Insufficient light or nutrient deficiency.
How to fix it
Ensure the plant receives adequate sunlight and fertilize appropriately.
Care through the year
Spring
In spring, increase watering as the plant begins to actively grow. Fertilize every 4-6 weeks and prune to shape the plant.
Summer
During summer, ensure the plant receives full sun and monitor for pests. Water regularly, allowing the soil to dry out between waterings.
Fall
In fall, reduce watering frequency as growth slows. Continue to fertilize but prepare for winter by checking for pests and diseases.
Winter
In winter, water less frequently, allowing the soil to dry out more. Keep the plant in a warm location away from drafts and cold windows.
Toxicity & Safety
Pelargonium crispum is considered non-toxic to pets and children. However, ingestion of large quantities may cause mild gastrointestinal upset. Always monitor for any unusual reactions.
Good to know
How often should I water my Pelargonium crispum?
Water your Pelargonium crispum when the top inch of soil feels dry, typically every 1-2 weeks. Adjust based on humidity and temperature.
Why are my Pelargonium crispum leaves turning yellow?
Yellow leaves can indicate over-watering or poor drainage. Check the soil moisture and ensure the pot has proper drainage.
What light conditions are best for Pelargonium crispum?
Pelargonium crispum thrives in full sun, needing at least 6 hours of direct sunlight daily for optimal growth and blooming.
Can I propagate Pelargonium crispum from cuttings?
Yes, you can propagate Pelargonium crispum from stem cuttings. Take cuttings in spring or early summer, allow them to dry, and plant in well-draining soil.
What temperature range is ideal for Pelargonium crispum?
Pelargonium crispum prefers temperatures between 65-75°F (18-24°C) and should be protected from frost.
How do I encourage more blooms on my Pelargonium crispum?
To encourage more blooms, ensure your plant receives plenty of sunlight, deadhead spent flowers, and fertilize regularly during the growing season.
Is Pelargonium crispum toxic to pets?
Pelargonium crispum is considered non-toxic to pets and children, but ingestion of large amounts may cause mild gastrointestinal upset.
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