Regal Geranium (Pelargonium grandiflorum)

Regal Geranium

Pelargonium grandiflorum

Ruffled blooms in soft pastels bring cottage garden charm. Evergreen flowering perennial; common names: Regal Geranium, Martha Washington Geranium.

Partial sun
1–2/week
Moderate
🌱

Plant Needs

☀️
Sunlight Bright direct to partial sunlight; tolerate gentle morning sun, avoid intense midday summer sun to prevent leaf scorch
💧
Watering Water thoroughly when the top 2–3 cm of soil is dry; avoid overwatering to prevent root rot and fungal growth
🌡️
Temperature Thrives in 15–22°C; protect from frost, maintain temperatures above 10°C during winter dormancy
🔍

Characteristics

  • Leaf: Round to kidney-shaped, softly hairy, with subtle lobed margins and faint citrus scent when crushed
  • Flower: Large, ruffled umbels in shades of pink, purple, white, or bicolor; individual blooms have five petals
  • Stem: Succulent, green to reddish-brown, branching freely to form dense mounds
🛠️

Care Guide

Watering

Keep soil evenly moist but not waterlogged; increase frequency during hot, dry spells

Fertilization

Diluted balanced liquid fertilizer every 2 weeks to support bloom production. Avoid fertilizing during winter dormancy to prevent root burn

Banana peel compost tea:Compost banana peels for 2–3 weeks to break down nutrients, steep in water for 24 hours, dilute 1:20 for root drench; avoid using raw peels to prevent pest infestations and odor
Pruning
  • Deadhead spent blooms regularly to encourage continuous flowering throughout the growing season
  • Pinch back stem tips in early spring to promote bushier, more compact growth
  • Trim leggy stems after flowering to maintain a neat, mounding shape
  • Remove yellowing or damaged leaves to improve airflow and reduce the risk of fungal disease
⚠️

Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; ingestion may cause vomiting, anorexia, depression, and skin irritation from contact

Humans: Mild oral irritation and nausea if ingested in large quantities; contact may cause minor skin redness in sensitive individuals

📖

Garden Uses & Culture

Culture: Symbolizes friendship, happiness, and domestic warmth in traditional cottage garden aesthetics

Usage: Ornamental container plant for patios, windowsills, and garden borders; used in cut flower arrangements for short-term displays