Giant herb-robert (Geranium maderense)

Giant herb-robert

Also known as: Madiera cranesbill

Giant herb-robert is a popular, award-winning ornamental species with dramatic pink and lilac flowers that add great color to the beds and borders of cottage and Mediterranean gardens. The stems and sepals of the giant herb-robert are covered in hairs that trap insects, encouraging pollination.

Scientific classification

Species

Giant herb-robert (Geranium maderense)

Geraniums, bridal wreaths, and allies

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Perennial, Biennial

Lifespan

20 cm

Spread

Green, Blue

Leaf Color

2.5 cm to 5 cm

Flower Size

Pink

Flower Color

Red, Green, Pink

Stem Color

Evergreen

Leaf type

10 - 35 ℃

Ideal Temperature

Images of Giant herb-robert

Distribution of Giant herb-robert

Distribution Map

Giant herb-robert is endemic to the subtropical North Atlantic region. Since its discovery, it has been introduced and cultivated in various parts of the temperate world, notably in regions corresponding to the South Pacific and Northern Europe. Although not a native species in these areas, its ability to adapt has allowed for successful cultivation outside its natural range.

Native

Cultivated

Invasive

Introduced

No species reported

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Quickly Identify Giant herb-robert

Large, deeply dissected dark green leaves creating a dense mound.

Mauve-pink flowers, 1 inch (2.5 cm) wide, on a 5 feet (1.5 meters) tall inflorescence.

Purple hairs on flowers and stems that glisten in the light.

Purple hairs maintain decorative value post-blooming.

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Care Guide for Giant herb-robert

Every week

Water

Full sun

Sunlight

10 - 35 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Giant herb-robert thrives in subtropical climates, preferring moist, well-drained soil with consistent moisture, but shows moderate drought tolerance once established. Weekly watering is essential for hydration, and mulching helps retain moisture during the active growing season.

Fertilize: Giant herb-robert requires monthly fertilization with balanced nutrition during the growing season and a high-phosphorus formula during bloom. Use a quarter-strength solution to prevent nutrient burn and avoid winter feeding. Monitor plant response to prevent over-fertilization and ensure optimal health and growth.

Pruning: Giant herb-robert thrives with early spring to late winter pruning. Trim dead or damaged stems for healthy growth, and remove spent flowers to encourage blooms. Regular pruning improves air circulation and disease prevention, ensuring an attractive plant. Techniques align with reputable horticultural practices.

Propagation: Giant herb-robert thrives when propagated through healthy cuttings, ideally 4-6 inches long in well-draining medium. Use rooting hormone for better results. Maintain consistent moisture and warmth, avoiding overwatering. Once rooted, acclimatize gradually before transplanting outdoors for successful growth.

Repotting: Repot 'giant herb-robert' every 2-3 years in early spring, using a container one size larger. Ensure aftercare with shade from direct sunlight and consistent moisture to support its impressive foliage and vigorous growth. Following these guidelines will help 'giant herb-robert' thrive beautifully.

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