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Agastache 'Blackadder' (Giant hyssop 'Blackadder')
Agastache 'Blackadder' (Giant hyssop 'Blackadder'): Bright blue flower spikes and aromatic foliage - very attractive to bees. To 1.2m. Hardy [Collect Only]
Aster macrophyllus 'Twilight' (Syn. Eurybia x herveyi)
Aster macrophyllus 'Twilight' (Syn. Eurybia x herveyi): Lavender-blue flowers with a yellow centre in late summer. Mildew-resistant foliage. An earlier flowering variety. Height to 1m.
Eryngium x zabelii 'Big Blue (Sea Holly 'Big Blue)
Eryngium x zabelii 'Big Blue (Sea Holly 'Big Blue): Large electric-blue thimble-shaped flowers with a spiky collar and silver-green foliage. Long flowering and bee-friendly. Hardy. Up to 75cm [Collect Only]

Found 3 matches:

Colour: Blue [ X ]
Aspect: Sun [ X ]
Flowering: Late Summer [ X ]

Height when grown

60cm to 90cm (1)
90cm to 1.2m (2)

Soil

Drained (3)
Dry (3)
Moist (1)
Normal (1)

Spread Rate

Moderate (2)
Slow (1)