Senecio aquaticus
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Senecio aquaticus

Water ragwort · Marsh Ragwort

Tier 2 Difficulty: medium Water: low Light: full_sun Toxicity: low
Temperature
10–35 °C
Soil pH
6–7
Hardiness
Zone 6–9
Click count
1
Observations
3

Description

Source: leafsnap

Jacobaea aquatica or Senecio aquaticus, the water ragwort or marsh ragwort, is a plant of the family Asteraceae. It is a perennial or biennial plant: young plants form a rosette near the ground, eventually producing a taller flowering shoot with many bright yellow flower heads, each with prominent ray florets. It grows in damp, grazed grassland, especially where there has been some disturbance.

🌳 Although valued for its looks and long-standing medicinal use, dusty miller surprisingly acts as a natural detector. Like the famous coal-mine canaries, it warns of copper in its surroundings by changing the color of its leaves. Unlike other plants that deteriorate under metallic stress, dusty miller resiliently signals soil contamination.

🎭 Yield

Care Guide

💧 Water
☀️ Light Full sun

Dusty miller grows best with abundant sunlight, although reduced light does not always impede its development. It comes from areas known for strong sun, and a lack of light can cause weak growth and faded leaves. Too much sun, however, can lead to leaf scorch.

Ideal: Full sun
🌡️ Temperature 10–35°C

The native habitat of dusty miller is typically in areas where temperatures range from 50 to 95 ℉ (10 to 35 ℃). Its temperature tolerance lies within that range, with a preferred range of 50 to 80 ℉ (10 to 27 ℃). In colder seasons, placing it in a sheltered location can help it adjust to temperature changes and protect it from frost damage. In warmer seasons, offering light shade during the hottest part of the day can help prevent heat stress.

Ideal temperature: 10–35°C
💨 Humidity
Humidity:
🪴 Soil 6-7
Soil pH: 6-7
🌱 Fertilizer

Usually one fertilizer application in spring is enough for Dusty miller, though repeated feedings can maximize growth. Apply fertilizer every month to a month and a half. Fertilizing improves the leaves’ appearance and function, helping maintain uniform color and a healthy texture. It also promotes root development and nutrient uptake, supporting long-term plant health.

🪴 Pot & Repot 2-3 years

When repotting Dusty miller, choose a pot 1-2 inches (2.5–5.1 cm) larger with ample drainage. Use a well-draining potting mix. Repot in spring or fall, making sure the root ball is slightly below the rim of the flower pot. Water thoroughly after repotting and place it in a warm spot with indirect sunlight.

Suggested frequency: 2-3 years
✂️ Pruning
🌿 Propagating
🐛 Diseases & pets
☠️ Toxicity

Characteristics

Plant Type
Herb
Life Cycle
Perennial
Genus
Senecio
Family
Asteraceae
Hardiness Zone
6-9
Mature Height
15 cm to 46 cm
Mature Spread
15 cm to 46 cm
Leaf Color
Green, Silver
Leaf Type
Evergreen
Flower Color
Yellow, Gold
Flower Size
2.54 cm to 7.62 cm
Bloom Time
Late spring, Early summer, Mid summer
Planting Time
Spring
Harvest Time
Summer
Native Area
Italy, Spain, France

Tags (7)

Common Names (2)

en Water ragwort
en Marsh Ragwort