Geranium psilostemon ‘Catherine Deneuve’

Description

Geranium psilostemon ‘Catherine Deneuve’ is a stunning hardy perennial known for its vivid star-shaped magenta-pink flowers set beautifully against mid-green foliage. Because it flowers from May to September, Geranium adds long-lasting colour, texture and movement to borders, cottage gardens and mixed perennial displays. Follow this comprehensive guide to help your Geranium thrive throughout the growing season.

PLANTING and AFTERCARE GUIDE

Best Planting Time

Plant Geranium psilostemon ‘Catherine Deneuve’ when the soil naturally begins to warm or gently retains residual warmth, as this supports strong early root development and ensures vigorous growth before flowering begins.

Site Selection

• Sunlight: Choose a spot with full sun or partial shade, as this ensures Geranium psilostemon ‘Catherine Deneuve’ develops strong stems and produces its striking magenta blooms in abundance. Additionally, good light supports lush, healthy foliage.
• Soil: Geranium thrives in well-drained, moderately fertile soil. Improving compacted or heavy areas with compost or grit enhances drainage and root development, consequently supporting reliable flowering.

Planting Instructions

1. Prepare the Hole: Dig a hole twice the width of the root ball and equal in depth, giving your Geranium space to establish a strong root system.
2. Soil Preparation: Mix organic matter such as compost into the soil to improve structure and fertility, which results in healthier establishment and more vigorous growth.
3. Planting: Position the plant so the top of the root ball sits level with the surrounding soil, then gently backfill and firm to remove any air pockets.
4. Watering After Planting: Water thoroughly to settle the soil around the roots and ensure consistent moisture reaches the root zone without pooling.

Watering Requirements

• Growing Season: Water moderately, allowing the soil surface to dry slightly between waterings. Since Geranium prefers free-draining soil, avoiding excess moisture supports strong, continuous blooming.
• Dormant Period: Water sparingly and only when the soil is noticeably dry, allowing the plant to rest naturally without exposing the roots to unnecessary moisture.

Feeding

• Spring: Apply a balanced fertiliser to encourage fresh leafy growth and early flower development, helping Geranium psilostemon ‘Catherine Deneuve’ begin the season with strength.
• Mid-Summer: A gentle supplementary feed maintains vigour and supports ongoing flowering throughout the warmer months.

Pruning

• Deadheading: Remove spent flowers regularly to prolong the blooming season and maintain an attractive shape. Deadheading also redirects energy into producing new buds.
• Seasonal Cutting Back: After peak flowering, trim the plant lightly to refresh the foliage and encourage tidy regrowth.

Mulching

• Spring Mulch: Apply a thin layer of organic mulch to conserve moisture, suppress weeds and improve soil structure around Geranium psilostemon ‘Catherine Deneuve’.
• Winter Mulch: A light protective mulch helps stabilise soil conditions and supports long-term root health.

Supporting the Plant

Reaching around 50 cm tall, Geranium psilostemon ‘Catherine Deneuve’ typically stands well on its own; however, in more exposed areas, light support may help prevent stems from leaning.

Final Tips

Geranium psilostemon ‘Catherine Deneuve’ is a hardy, rewarding perennial that offers brilliant colour and dependable performance from late spring through early autumn. By planting it in a bright, well-drained site, watering moderately and feeding occasionally, you will enjoy months of bold star-shaped blooms and healthy foliage. With minimal maintenance, Geranium psilostemon ‘Catherine Deneuve’ becomes a standout feature in any garden year after year.

RHS Details

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