Trichocereus spachianus
echinopsis spachiana
Also known as: ["Candle Cactus","Lighthouse Cactus"]
Overview
A columnar cactus native to South America, known for its nocturnal white flowers and fast growth.
Benefits & Perks
["drought tolerant","fast growing","fragrant flowers","wildlife attractant (bees, butterflies, birds)"]
Botanical Classification
| Phylum: | Magnoliophyta |
| Class: | Magnoliopsida |
| Order: | Caryophyllales |
| Family: | Cactaceae |
| Genus: | Echinopsis |
| Botanical Name: | Echinopsis spachiana |
Plant Characteristics
Basic Information
- Category: Succulents & Cacti
- Suitable Location: indoor pot in bright, sunny location or outdoor garden in arid, well-drained area
- Suitable For:
- Is Weed: No
- Allergenicity: low
Environmental Needs
- Climate: {"temperatureRange":"5–35°C"}
- Hardiness: {"zones":"9–11"}
- Misting: rarely required, only if ambient humidity is very low
- Drainage: Fast-draining to prevent root rot.
- Soil Type: Well-draining cactus mix with added perlite or sand.
Maintenance Level
- Maintenance Level: low
- Toughness Level: high
- Pruning Frequency: As needed, typically annually or after flowering.
- Pruning Intensity: Light to moderate; avoid heavy pruning unless necessary.
Care Details
Ideal Sunlight Coverage:
Bright indirect light or full sun (4–6 hours/day); adjust to avoid scorching in intense summer sun.
Sunlight Tolerance Tips:
Acclimate gradually to intense light; provide shade during peak summer hours; rotate regularly for even growth.
Care Requirements
Care Difficulty
easyeasy
Sunlight
full sun to partial shade
Avoid direct midday sun in summer; provide bright light in winter; rotate plant weekly.
Watering
every 7–10 days during growing season, reduce to monthly in winter
Water deeply but infrequently; ensure soil dries completely between waterings; avoid overhead watering.
Soil
well-draining, sandy cactus mix
pH: Slightly acidic to neutral (6.0–7.0).
Ensure pots have drainage holes; avoid heavy potting soils; top-dress with gravel if needed.
Temperature
Prefers 65–85°F (18–29°C); tolerates mild frost but thrives in warm, dry conditions.
Protect from frost; avoid sudden temperature swings; ensure good air flow in warm weather.
Fertilizing
every 4–6 weeks during active growth with balanced cactus fertilizer
Fertilize only when actively growing; avoid over-fertilizing; flush soil occasionally to prevent salt buildup.
Propagation
Methods
Stem cuttings or offsets (pups); occasionally by seed.
Step-by-Step Propagation Guide
- Cut a healthy stem/offset.
- Let callus for 1–2 days.
- Plant in medium.
- Water sparingly.
Best Time: Spring or early summer when the plant is actively growing.
Environment
Warm (70–80°F), high humidity (60–70%), and bright indirect light.
Medium
Cactus mix or perlite/sand mix with minimal organic matter.
Hormone
Optional, but rooting hormone can speed up the process.
Timeline
Roots form in 2–4 weeks; establish in new pot within 2–3 months.
Tools Needed
Sharp knife, rooting hormone, pots, cactus mix.
Quick Tips
Use sterile tools; avoid overwatering; provide bottom heat if possible.
Pruning & Repotting
Pruning Guide
Method
Cut stems cleanly at the base; allow cuts to callus before handling.
Pruning Plan
Minimal pruning; remove dead or damaged stems to maintain shape and health.
Tools
Sterile pruning shears or a sharp knife.
Checklist
Sterilize tools; cut cleanly; allow callusing; dispose of debris.
Repotting Guide
Best Season
Spring, before active growth begins.
Pot Size
One size larger pot (1–2 inches wider); ensure drainage holes.
Method
Remove plant gently; trim roots if needed; repot in fresh cactus mix with good drainage.
Suggestions
Repot every 2–3 years or when roots fill the pot; necessary for growth and drainage.
Checklist
Use fresh soil; check roots; ensure proper drainage; avoid over-potting.
Advanced Care Tips
Watering Mastery
Watering Checklist
Check soil moisture; water deeply; ensure drainage; adjust seasonally.
How to Apply Water Properly
Water directly at the root zone until water drains from the bottom; ensure even saturation without pooling; water in the morning to allow foliage to dry.
Watering Schedule Tips
Water thoroughly during active growth (spring/summer) when soil is dry to the touch; reduce frequency in fall/winter to prevent root rot.
Soil Improvement
Add coarse sand or perlite to improve drainage; use a mix with minimal organic matter.
Temperature Stress Management
Signs of Temperature Issues
Chlorosis, stunted growth, or soft stems in cold; wilting or sunburn in excessive heat.
Cold Stress
Slows growth, may cause root rot if soil remains wet; can suffer cellular damage below 40°F (4°C).
Solution: Move to a warmer location; ensure soil is dry; provide frost protection if outdoors.
Hot Stress
Leaves may wilt, flowers drop, or growth halts; risk of sunburn on stems.
Solution: Provide shade during peak heat; increase air circulation; water early in the day.
Fertilizing Guide
Fertilizing Checklist
Use diluted fertilizer; apply during growing season; avoid winter feeding.
Fertilizing Method
Use a balanced cactus fertilizer diluted to half strength every 4–6 weeks during spring/summer; cease in fall/winter.
Common Problems & Solutions
Toxicity Warning
Cats
Non-toxicEchinopsis spachiana is not toxic to cats. There are no known adverse effects from ingestion of this cactus by felines.
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Dogs
Non-toxicEchinopsis spachiana is not toxic to dogs. There are no known adverse effects from ingestion of this cactus by canines.
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Humans
Non-toxicEchinopsis spachiana is generally considered non-toxic to humans. There are no known toxic compounds or physiological effects associated with ingestion of this cactus.
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Frequently Asked Questions
Q: How often should I water Echinopsis spachiana?
A: Water sparingly, allowing the soil to dry completely between waterings, especially during winter dormancy.
Q: Does this cactus require full sun?
A: Yes, it thrives in full sun but can tolerate partial shade.
Q: Why are the stems turning yellow?
A: Yellowing may indicate overwatering or poor drainage; ensure the plant is not sitting in water.
Quick Reference
| Family: | Cactaceae |
| Care: | easy |
| Light: | full sun to partial shade |
| Water: | every 7–10 days during growi |
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