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Veronica longifolia 'Blauriesin'
© Deeproot Plant Base
common name: Speedwell
synonyms: Veronica longifolia 'Blue Giantess', Veronica longifolia 'Foerster's Blue'
growth rate: medium
growth habit: clump
leaf colour: green
flower colour: blue
main season: Summer
full sun, part shade
preferred soil pH: neutral
minimum temp: -15°C
USDA zone: 4 to 9
Clump forming perennial with toothed green leaves and tall slender spikes of densely packed deep-blue flowers in summer.
Moderately fertile, moist, well drained soil in full sun or bright part shade.
Dead-head regularly to extend flowering period
By division in autumn or spring.