Queen of the Night
selenicereus grandiflorus
Also known as: ["Night-Blooming Cereus","Giant Orchid Cactus"]
Overview
A vining epiphytic cactus known for its large, fragrant, nocturnal flowers that bloom only at night and last for a single night.
Benefits & Perks
["fragrant flowers","aesthetic foliage","wildlife attractant (bees, butterflies, birds)","low maintenance"]
Botanical Classification
| Phylum: | Magnoliophyta |
| Class: | Magnoliopsida |
| Order: | Caryophyllales |
| Family: | Cactaceae |
| Genus: | Selenicereus |
| Botanical Name: | Selenicereus grandiflorus |
Plant Characteristics
Basic Information
- Category: Succulents & Cacti
- Suitable Location: indoor pot with bright, indirect light or sheltered outdoor location
- Suitable For:
- Is Weed: No
- Allergenicity: low
Environmental Needs
- Climate: {"temperatureRange":"15–35°C"}
- Hardiness: {"zones":"10–11"}
- Misting: rarely required, only if ambient humidity is very low
- Drainage: Fast-draining to prevent waterlogged roots.
- Soil Type: Well-draining cactus or succulent mix with added perlite or coarse sand for improved drainage.
Maintenance Level
- Maintenance Level: moderate
- Toughness Level: moderate
- Pruning Frequency: As needed, typically every 1–2 years or after flowering.
- Pruning Intensity: Moderate; remove up to one-third of the stems if necessary.
Care Details
Ideal Sunlight Coverage:
Bright indirect light for 6–8 hours daily. Can tolerate direct morning sun but avoid harsh afternoon sun, especially in summer.
Sunlight Tolerance Tips:
Acclimate gradually to direct sun to avoid scorching. Place in a spot with filtered light or dappled shade outdoors. Indoors, position near an east or south-facing window with sheer curtains.
Care Requirements
Care Difficulty
moderateeasy
Sunlight
bright indirect light, partial shade
Rotate plant weekly for even growth; provide shade during peak summer hours; avoid direct afternoon sun.
Watering
every 7–10 days during active growth, every 3–4 weeks in winter
Water deeply but infrequently; ensure soil dries fully between waterings; reduce watering in dormant periods.
Soil
well-draining cactus or succulent mix
pH: Slightly acidic to neutral (pH 6.0–7.0).
Ensure pots have drainage holes; avoid heavy, water-retentive soils; use a mix with inorganic components.
Temperature
Prefers warm temperatures between 70–85°F (21–29°C). Can tolerate a mild drop to 50–55°F (10–13°C) in winter but avoid prolonged cold.
Avoid sudden temperature fluctuations; protect from drafts; maintain consistent warmth during active growth.
Fertilizing
every 4–6 weeks during active growth with a balanced cactus fertilizer
Dilute fertilizer to prevent salt buildup; fertilize only during active growth; flush soil occasionally to remove excess salts.
Propagation
Methods
Stem cuttings are the most effective method. Select healthy, non-flowering stems and cut into 3–6 inch segments.
Step-by-Step Propagation Guide
- Cut stem segments.
- Let callus over 1–2 days.
- Apply rooting hormone (optional).
- Plant in propagation medium.
- Maintain humidity and warmth.
Best Time: Spring or early summer when the plant is actively growing.
Environment
Warm, humid environment with bright indirect light and temperatures around 75–85°F (24–29°C).
Medium
Well-draining mix of cactus soil and perlite (1:1 ratio).
Hormone
Rooting hormone is optional but recommended for faster rooting.
Timeline
Roots typically form in 2–4 weeks; new growth may appear in 1–2 months.
Tools Needed
Pruning shears, rooting hormone, small pots, well-draining soil mix, plastic wrap or propagator.
Quick Tips
Allow cut ends to callus before planting; maintain high humidity; avoid overwatering during rooting.
Pruning & Repotting
Pruning Guide
Method
Cut stems just above a node or joint. Use clean, sharp tools to minimize damage and prevent disease.
Pruning Plan
Prune to control size, encourage bushier growth, and remove dead or damaged stems. Pruning also helps improve air circulation and flowering.
Tools
Pruning shears, sterilizing solution (e.g., rubbing alcohol), gloves.
Checklist
Sterilize tools; prune during active growth; remove dead/damaged stems; cut just above a node.
Repotting Guide
Best Season
Spring, before the active growing season begins.
Pot Size
Increase pot size by 1–2 inches in diameter.
Method
Gently remove the plant; trim any dead roots; place in a slightly larger pot with fresh, well-draining soil; water lightly after repotting.
Suggestions
Repot every 2–3 years or when the plant becomes root-bound. Repotting refreshes the soil and provides space for growth.
Checklist
Choose appropriate pot size; use fresh soil mix; trim roots if necessary; water sparingly after repotting.
Advanced Care Tips
Watering Mastery
Watering Checklist
Check soil moisture before watering; water deeply; ensure drainage; reduce frequency in winter.
How to Apply Water Properly
Water directly at the root zone, ensuring even moisture distribution. Water until it drains from the bottom, then discard excess to prevent waterlogging. Water in the morning to allow foliage to dry before nightfall.
Watering Schedule Tips
Water sparingly during spring and summer, allowing soil to dry completely between waterings. Reduce watering significantly in fall and winter, providing only occasional moisture to prevent root rot.
Soil Improvement
Add perlite, coarse sand, or pumice to commercial potting soil to enhance drainage and aeration.
Temperature Stress Management
Signs of Temperature Issues
Chlorosis (yellowing leaves), stunted growth, bud drop, or blackened stems due to cold stress; wilting or scorching due to excessive heat.
Cold Stress
Low temperatures slow metabolic processes, leading to root damage and susceptibility to fungal infections. Prolonged cold can cause irreversible tissue damage.
Solution: Move plant to a warmer location; insulate pots with bubble wrap; avoid placing near drafty windows or cold surfaces.
Hot Stress
Excessive heat can cause dehydration, sunburn, and wilting. High temperatures combined with intense light may lead to leaf scorch or flower bud abortion.
Solution: Provide shade during peak heat; increase humidity with misting or a pebble tray; ensure adequate ventilation and water as needed.
Fertilizing Guide
Fertilizing Checklist
Use diluted fertilizer; apply during growing season; avoid winter feeding; flush soil periodically.
Fertilizing Method
Use a balanced, water-soluble cactus fertilizer diluted to half strength. Apply every 4–6 weeks during spring and summer. Avoid fertilizing in fall and winter.
Common Problems & Solutions
Toxicity Warning
Cats
Non-toxicSelenicereus grandiflorus is not considered toxic to cats. The plant does not contain known toxic substances that would harm felines if ingested or if the plant comes into contact with their skin.
⚡ Toxic If:
Generally non-toxic
Dogs
Non-toxicSelenicereus grandiflorus is not considered toxic to dogs. There are no known toxic compounds in this plant that would pose a risk to canine health if ingested or if the plant comes into contact with the skin.
⚡ Toxic If:
Generally non-toxic
Humans
Non-toxicSelenicereus grandiflorus is not considered toxic to humans under normal circumstances. The plant is not known to produce any significant toxic compounds that would cause adverse effects upon ingestion or contact.
⚡ Toxic If:
Generally non-toxic
Frequently Asked Questions
Q: Why won't my Queen of the Night bloom?
A: It requires long periods of darkness (12-14 hours) and cool temperatures (50-60°F) to initiate blooming.
Q: How often should I water this plant?
A: Water thoroughly but infrequently, allowing the soil to dry out completely between waterings.
Q: Can I grow this plant outdoors?
A: Yes, it thrives in warm, humid climates and can be grown outdoors in USDA zones 10-12.
Quick Reference
| Family: | Cactaceae |
| Care: | moderate |
| Light: | bright indirect light, partial |
| Water: | every 7–10 days during activ |
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