Yellow Water Primrose
ludwigia grandiflora
Also known as: ["Yellow Water Primrose","Broadleaf Water Primrose"]
Overview
A perennial aquatic plant native to North and South America, known for its bright yellow flowers and invasive tendencies in some regions.
Benefits & Perks
["long-flowering","wildlife attractant (bees, butterflies, birds)","drought tolerant"]
Botanical Classification
| Phylum: | Magnoliophyta |
| Class: | Magnoliopsida |
| Order: | Myrtales |
| Family: | Onagraceae |
| Genus: | Ludwigia |
| Botanical Name: | Ludwigia grandiflora |
Plant Characteristics
Basic Information
- Category: Flowers
- Suitable Location: wetland gardens, pond edges, or containers with consistently moist soil
- Suitable For:
- Is Weed: No
- Allergenicity: low
Environmental Needs
- Climate: {"temperatureRange":"10–30°C"}
- Hardiness: {"zones":"8–11"}
- Misting: rarely required, only if ambient humidity is very low
- Drainage: Fast-draining to prevent waterlogging.
- Soil Type: Well-draining, fertile soil with organic matter; a mix of loam, peat, and perlite works well.
Maintenance Level
- Maintenance Level: moderate
- Toughness Level: moderate
- Pruning Frequency: Every 2–3 months or as needed to control size and shape.
- Pruning Intensity: Moderate; remove up to one-third of the plant if overgrown, but avoid heavy pruning during flowering
Care Details
Ideal Sunlight Coverage:
Full sun to partial shade; 6–8 hours of direct sunlight per day, with some afternoon shade in hot climates.
Sunlight Tolerance Tips:
Acclimate plants gradually to intense sunlight; protect from harsh afternoon sun to prevent scorching; adjust placement based on indoor/outdoor conditions.
Care Requirements
Care Difficulty
moderatemoderate
Sunlight
full sun to partial shade
Rotate plant for even light exposure; use sheer curtains to filter intense light; provide shade during peak summer hours.
Watering
every 7–10 days, allowing soil to dry slightly between waterings
Water thoroughly until it drains from the bottom; allow soil to dry slightly between waterings; avoid overwatering.
Soil
moist, fertile, loamy soil with good organic content
pH: Slightly acidic to neutral (pH 6.0–7.0).
Ensure soil is loose and airy; avoid heavy clay mixes; test pH periodically.
Temperature
Prefers warm temperatures between 65–85°F (18–29°C); thrives in tropical to subtropical climates.
Monitor temperature fluctuations; use a thermometer to track conditions; adjust care based on seasonal changes.
Fertilizing
every 4–6 weeks during growing season with balanced liquid fertilizer
Apply fertilizer after watering to prevent root burn; avoid over-fertilizing to prevent nutrient buildup; flush soil occasionally to remove excess salts.
Propagation
Methods
Stem cuttings are the most effective method; take cuttings from healthy, non-flowering stems.
Step-by-Step Propagation Guide
- Take a 4–6 inch cutting.
- Remove lower leaves.
- Dip in rooting hormone.
- Plant in moist medium.
- Maintain humidity.
Best Time: Spring or early summer when the plant is actively growing.
Environment
High humidity (70–90%), warm temperatures (70–75°F or 21–24°C), and indirect light.
Medium
A mix of peat moss and perlite or a standard potting mix with good drainage.
Hormone
Rooting hormone is recommended to encourage faster root development.
Timeline
Roots typically develop in 2–4 weeks; new growth may appear in 6–8 weeks.
Tools Needed
Pruning shears, rooting hormone, small pots, humidity dome or plastic bag, misting spray bottle.
Quick Tips
Use sharp, sterile tools to prevent disease; keep soil consistently moist but not waterlogged; provide bottom heat if possible.
Pruning & Repotting
Pruning Guide
Method
Use clean cuts just above a leaf node or branch junction; remove leggy or crossing stems.
Pruning Plan
Prune to maintain shape, encourage bushier growth, and remove dead or diseased parts.
Tools
Pruning shears, sharp knife, disinfectant (e.g., rubbing alcohol).
Checklist
Disinfect tools before use; prune during active growth; remove dead or yellowing leaves; shape evenly.
Repotting Guide
Best Season
Spring, before the active growing season begins.
Pot Size
Choose a pot one size larger (1–2 inches wider in diameter) than the current one.
Method
Gently remove the plant; trim any circling roots; place in a new pot with fresh soil; water thoroughly after repotting.
Suggestions
Repot every 1–2 years or when roots fill the pot; beneficial for root health and growth.
Checklist
Select appropriate pot size; prepare fresh soil mix; handle roots carefully; water after repotting.
Advanced Care Tips
Watering Mastery
Watering Checklist
Check soil moisture before watering; water thoroughly; ensure proper drainage; adjust frequency based on season.
How to Apply Water Properly
Water directly at the base of the plant, ensuring moisture reaches the root zone; water early in the morning to minimize evaporation; ensure excess water drains away to prevent waterlogging.
Watering Schedule Tips
Water deeply once the top inch of soil is dry; reduce frequency in winter to prevent root rot.
Soil Improvement
Add perlite or sand for drainage; incorporate compost for fertility; use a soil aerator if compacted.
Temperature Stress Management
Signs of Temperature Issues
Wilting, yellowing leaves, stunted growth, or leaf drop in response to extreme temperatures.
Cold Stress
Low temperatures slow growth and can cause leaf damage or dieback; prolonged cold may lead to plant death.
Solution: Protect from frost with a cover or move indoors; maintain consistent warmth; avoid placing near cold drafts.
Hot Stress
Excessive heat can cause leaf scorch, wilting, or reduced flowering; may lead to dehydration.
Solution: Provide shade during peak heat; increase watering frequency; ensure good air circulation.
Fertilizing Guide
Fertilizing Checklist
Check fertilizer label for NPK ratio; dilute correctly; apply during active growth; avoid winter feeding.
Fertilizing Method
Use a balanced liquid fertilizer diluted to half strength every 4–6 weeks during the growing season; reduce or stop in winter.
Common Problems & Solutions
Toxicity Warning
Cats
Slightly ToxicLudwigia grandiflora is slightly toxic to cats if ingested, with potential to cause mild gastrointestinal issues. The plant does not contain severe toxins but can lead to discomfort in felines.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Dogs
Slightly ToxicLudwigia grandiflora poses a slight risk to dogs if ingested, potentially causing mild gastrointestinal upset. The plant is not highly toxic but can lead to discomfort in pets.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Humans
Slightly ToxicLudwigia grandiflora is considered slightly toxic to humans, primarily due to its potential to cause gastrointestinal distress if ingested. The plant does not contain highly potent toxins but can induce mild discomfort.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Frequently Asked Questions
Q: Is Ludwigia grandiflora invasive?
A: Yes, it is considered invasive in many regions outside its native habitat.
Q: Does it require full sun?
A: Yes, it thrives in full sun conditions.
Q: Can it grow in still water?
A: Yes, it is well-suited to still or slow-moving water environments.
Quick Reference
| Family: | Onagraceae |
| Care: | moderate |
| Light: | full sun to partial shade |
| Water: | every 7–10 days, allowing so |
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