Herbaceous plants (in botanical use frequently simply herbs) are plants that have no persistent woody stem above ground. The term is mainly applied to perennials, but in botany it may also refer to annuals or biennials, and include both forbs and graminoids.

Annual herbaceous plants die completely at the end of the growing season or when they have flowered and fruited, and they then grow again from seed.

Herbaceous perennial and biennial plants may have stems that die at the end of the growing season, but parts of the plant survive under or close to the ground from season to season.

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Agastache ā€˜Blue Boaā€™

Agastache are herbaceous perennials which are commonly known as Giant Hyssop. They are perfect for adding colour and vertical dimension to any landscape.

Campanula Ringsabell Indigo Blue

A tidy mound of slender stems with large drooping purple-blue bells in early to mid Summer. Very floriferous. Prefers a sun or partial shade position. Height 15cm. Spread 30cm.

Eryngium bourgatii

The silver veined dark green foliage is very impressive when it reappears. The stiff steely blue flowerstems and flowers add to its magic in summer. Height 60 cm. Spread 40 cm.

Geranium pratense Midnight Reiter

The true blue flowers combine well with its dark purple foliage in summer. Good for cottage style garden, container or border. Disease resistant plant. Height 30 cm. Spread 25 cm.

Geranium Rozanne

The violet-blue flowers have white centres and appear from late spring to November. Rewarding plant, rich flowering and a strong grower. Height 45 cm. Spread 50 cm.

Nepeta Walkers Low

Aromatic grey-green foliage. Dark lavender-blue flowers come in flushes from early Summer. Will continue to Autumn once deadheaded. Height 60cm. Spread 80cm. Drought tolerant.

Nepeta x. faassenii

Bushy, clump-forming. Useful for edging. Loose spikes of soft lavender-blue flowers in July-Aug. Height 45 cm. Position in full sunlight and in well drained soil.

Salvia nemerosa Caradonna

Violet-blue flower spikes from June to October. Grey-green scented foliage. A magnet for bees and butterflies. Height 30cm. Spread 45cm.

Salvia nemerosa Ostfriesland

Height 50cm. Neat, clump-forming. Violet-blue flowers in Summer in branching racemes.

Salvia x sylv Mainacht

Very dark blue - nearly black flower spikes from May-August. Height 40 cm. Sunny position, free-draining soil.

Tradescantia and Leonora

Spiderwort Unusual triangular blue flowers June-July, which are short-lived, but are produced in a long succession. Height 60 cm.