25 Plenum Geranium Seeds – Hardy Perennial with Double Purple Blooms for Cottage Gardens & Borders

Plenum Geranium is a hardy perennial known for its striking double purple blooms that resemble small roses. This old-fashioned favorite adds a touch of elegance to cottage gardens, borders, and containers, blooming generously from late spring through summer. Its deeply cut, aromatic foliage forms a tidy mound that remains attractive even when the plant is not in flower.

Easy to grow from seed, Plenum Geranium is a reliable choice for gardeners seeking long-lived, low-maintenance color. The nectar-rich flowers attract bees and butterflies, making it a welcome addition to pollinator-friendly landscapes. Whether massed in a border or used as a specimen in a mixed container, this geranium delivers dependable performance year after year.

Plant Features

• Double purple blooms with a rose-like appearance
• Hardy perennial that returns each season
• Aromatic, deeply lobed foliage
• Attracts bees and butterflies
• Excellent for cottage gardens, borders, and containers

Growing Information

• Botanical Name: Geranium pratense 'Plenum'
• Plant Type: Hardy perennial
• Sunlight: Full sun to partial shade
• Soil: Well-drained, moderately fertile soil
• Water Requirements: Medium; keep soil evenly moist but not waterlogged
• Growth Habit: Clump-forming
• Bloom Season: Late spring to summer
• Mature Height: 18–24 inches
• Spacing: 18–24 inches apart

Planting & Care

Sow seeds indoors 8–10 weeks before the last frost. Press seeds lightly into the soil surface, as they require light to germinate. Maintain a temperature of 65–70°F and keep the medium consistently moist. Germination typically occurs in 14–21 days. Once seedlings have several true leaves, transplant them into individual pots and harden them off before moving outdoors after the danger of frost has passed.

Plant in a sunny to partially shaded spot with well-drained soil. Water regularly during the first growing season to establish a deep root system. Deadhead spent blooms to encourage continued flowering. In late autumn, cut back foliage to ground level. Divide clumps every 3–4 years to maintain vigor.

What's Included

25 Plenum Geranium seeds.