Veronica longifolia (Europe to Asia)
Habit: Stiffly upright clumps, dense shoots; occasionally needing staking.
Size: 60-100 cm tall.
Flowers: Funnel-shaped, small, light blue, in elongated spikes, July to August.
Leaves: Lanceolate, pale green, shoots with whorls of leaves.
Demands: Sun to semi-shade, likes warmth, frost hardy.
Soil: Fresh to damp, humic, nutritious, peat, loam, clay or swamp soil.