This clump-forming perennial produces upright leafy stems topped with dense spikes of light to bright blue tubular, two-lipped flowers with a prominent lower lip. Blooming from late summer to mid-autumn, it offers long-lasting color.
Long bloom period. Suitable for edging, near water, or in mixed/herbaceous borders. U.S. native.
Grow in deep, moist soil. Fertilize every two weeks in spring and early summer to boost flowering. Plants may be trimmed back if they die back in hot summers.
Divide in summer. Take bud cuttings in midsummer.
Rust, smut, leaf spots, and slugs.
Caryopteris × clandonensis 'First Choice': Compact Bluebeard
Caryopteris × clandonensis 'Longwood Blue': Silvery Foliage, Violet-Blue Flowers
Veronica 'Sunny Border Blue' (Speedwell): Long-Blooming Violet-Blue Spikes
Great Blue Lobelia (Lobelia siphilitica): Cool Blues for Late Summer
Lobelia 'Cambridge Blue' – Classic Cambridge Blue for Containers
Lobelia 'Laguna Sky Blue' – Cascading Sky Blue for All Containers
Lobelia 'Waterfall Blue' – Cascading Blue for Baskets and Walls
Trailing Lobelia Not Blooming? Heat & Light Are the Culprits
Lobelia 'Regatta Midnight Blue' – Trailing Midnight Blue for Baskets
Lobelia 'Riviera Blue Eyes' – Compact Blue‑Eyed for Beds and Combos
Lobelia 'Riviera Blue Splash' – Compact Blue‑Splashed for Color Splashes
Lobelia 'Riviera Midnight Blue' – Compact Midnight Blue for Deep Color
Lobelia 'Riviera Sky Blue' – Compact Sky Blue for Airy Splashes
Nierembergia 'Summer Splash Blue' – Compact Blue Cup Flowers
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