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Family: GeraniaceaeMain Season: SummerFlower Colour: BlueLeaf Colour: GreenPosition: Light/Part ShadeSoil Type: Ordinary, medium loamHeight: 15cm to 30cm (6" to 12")Pot Size: 9cm
Charming double rosettes of mauve violet-blue over many weeks. Easy to grow in any reasonable (not too dusty dry) soil in sun or light shade. 30cm.
Like Geranium himlayense 'Irish Blue', 'Plenum' is less vigorous and makes smaller, less spreading clumps of the rounded mid-green leaves. The pretty double flowers are mostly produced from May to July but some repeat in August-September is also possible. On light, sandy soils 'Plenum' can tend to wander a bit rather than making a neat clump, but it's not vigorous enough to cause any problems.
Less suited to groundcover or edging than the single flowered forms of himlayan cranesbill, this form deserves a place in the border where it can be admired.
From 1928 as Geranium grandiflorum plenum and also known as Geranium himalayense 'Birch Double' under which name it was entered in the Royal Horticultural Society trial in 1976.
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