Queen Of The Night
Selenicereus grandiflorus
Selenicereus grandiflorus, commonly known as Queen of the Night, is a stunning cactus renowned for its large, fragrant blooms that open at night. Native to tropical regions, this plant is cherished for its unique flowering habit and striking appearance, making it a popular choice among plant enthusiasts.
Everything it needs
9 essentials at a glance
Watering
Selenicereus grandiflorus prefers to dry out between waterings.
During the growing season (spring and summer), water every 2-3 weeks, allowing the top 1-2 inches of soil to dry out completely. In fall and winter, reduce watering to once a month. Signs of over-watering include yellowing stems and mushy roots, while under-watering may cause shriveling and a loss of turgidity.
Light
This plant thrives in bright, indirect light but can tolerate some direct sunlight in the morning or late afternoon.
Ideally, it should receive 6-8 hours of light daily. Too much direct sunlight can scorch the leaves, while too little light can hinder flowering.
Soil
Selenicereus grandiflorus prefers a well-draining soil mix, ideally a cactus or succulent potting mix with added perlite or sand for aeration.
The ideal pH range is between 6.0 and 7.0. Ensure the pot has drainage holes to prevent water accumulation.
Humidity
This cactus prefers low humidity levels, typically around 30-50%.
To increase humidity, you can place a humidity tray with water near the plant or use a room humidifier. Signs of humidity stress include browning leaf tips and stunted growth.
Temperature
The ideal temperature range for Selenicereus grandiflorus is between 65-85°F (18-29°C).
It is hardy in USDA zones 10-11 and can tolerate brief periods of cooler temperatures down to 50°F (10°C) but should be protected from frost.
Fertilizing
Use a balanced cactus fertilizer with an NPK ratio of 10-10-10 during the growing season, applying every 4-6 weeks.
In fall and winter, refrain from fertilizing. Signs of nutrient deficiency include yellowing leaves and poor growth.
Pruning
Pruning is generally not necessary, but you can remove any dead or damaged stems to encourage healthy growth.
Use clean, sharp scissors or pruning shears. If you wish to shape the plant, do so in early spring before the growing season begins.
Repotting
Repot Selenicereus grandiflorus every 2-3 years or when it outgrows its pot.
Choose a pot that is 1-2 inches larger in diameter. Signs it needs repotting include roots growing out of the drainage holes or stunted growth. To repot, gently remove the plant from its current pot, shake off excess soil, and place it in the new pot with fresh soil.
Propagation
Propagation can be done through stem cuttings.
Take a healthy segment of the stem, allow it to callous for 1-2 days, then plant it in a well-draining soil mix. Water sparingly until roots develop, usually within a few weeks. The best time for propagation is in spring or early summer.
When it's unhappy
Yellow leaves
Why it happens
Over-watering or insufficient light.
How to fix it
Reduce watering frequency and ensure the plant receives adequate light.
Shriveling stems
Why it happens
Under-watering or low humidity.
How to fix it
Increase watering frequency and consider raising humidity levels.
Root rot
Why it happens
Poor drainage or over-watering.
How to fix it
Remove the plant from the pot, trim away rotten roots, and repot in fresh, dry soil.
Pests (e.g., mealybugs)
Why it happens
High humidity and poor air circulation.
How to fix it
Treat with insecticidal soap or neem oil, and improve air circulation.
Lack of flowers
Why it happens
Insufficient light or nutrients.
How to fix it
Ensure the plant receives enough light and fertilize during the growing season.
Care through the year
Spring
In spring, resume regular watering and fertilizing as the plant begins its active growth phase. Monitor for new growth and pests.
Summer
During summer, ensure your Queen of the Night receives plenty of bright, indirect light. Water every 2-3 weeks and watch for blooming.
Fall
In fall, gradually reduce watering as the plant prepares for dormancy. Stop fertilizing and ensure it is in a cooler location if necessary.
Winter
In winter, water sparingly, about once a month. Keep the plant in a warm location, away from drafts, and avoid fertilizing.
Toxicity & Safety
Selenicereus grandiflorus is non-toxic to pets and children. However, ingestion of any plant material can cause mild gastrointestinal upset, so it is best to keep it out of reach.
Good to know
Why are my Queen of the Night leaves turning yellow?
Yellow leaves on Selenicereus grandiflorus often indicate over-watering or insufficient light. Adjust your watering schedule and ensure the plant is receiving adequate light.
How often should I water my Queen of the Night?
Water your Selenicereus grandiflorus every 2-3 weeks during the growing season, allowing the soil to dry out completely between waterings. In winter, reduce watering to once a month.
What kind of soil is best for Queen of the Night?
A well-draining cactus or succulent potting mix is ideal for Selenicereus grandiflorus. You can enhance drainage by adding perlite or sand to the mix.
How can I propagate my Queen of the Night?
You can propagate Selenicereus grandiflorus through stem cuttings. Take a healthy stem segment, let it callous for 1-2 days, then plant it in well-draining soil.
When does Queen of the Night bloom?
Selenicereus grandiflorus typically blooms at night during the summer months, producing large, fragrant flowers that last only one night.
What pests should I watch for on my Queen of the Night?
Common pests include mealybugs and spider mites. Regularly inspect your plant and treat any infestations promptly with insecticidal soap or neem oil.
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