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Garden speedwell Seeds - Veronica longifolia

Veronica longifolia

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A hardy, vigorous perennial that blooms profusely in summer. It bears many slender, upright spikes covered with small, bright blue, star-shaped flowers and leaves that turn purple red in autumn. Growing generously in moist soil, this speedwell forms a mass of blooms where butterflies throng. It can be grown in any healthy garden soil that is not too dry, in the sun or partial shade.
Flower size
30 cm
Height at maturity
60 cm
Exposure
Sun
Annual / Perennial
Perennial
Germination time (days)
35 days
Sowing method
Direct sowing, Sowing under cover
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Sowing period March to April
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Flowering time June to July
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Description

Veronica longifolia, also known as garden speedwell or longleaf speedwell, is a very resistant perennial plant that blooms profusely in the summer and that is well adapted to wet, clay soils. In the summer, its long, dense looking spikes, thickly set with tiny, bright blue flowers, rise above a lush foliage, animated with the incessant flight of butterflies. In flower beds or at the edge of water features, it forms a huge mass of blooms which also attracts the eye with its beautiful autumn foliage. Very hardy, it can be grown without difficulty in any good quality garden soil, in deep, moist soil, in the sun or in partial shade. Its flowers are also very pretty in bouquets.

Veronica longifolia is a herbaceous plant of the family Plantagenaceae which is found in Northern and Central Europe and in Asia. Forming mounds that are quite large that bear erect stems, it sometimes grows to over 1 m in the wild and hybridizes easily with Veronica spicata. It is a plant for wet, clay, lime soils.

Longleaf speedwell's growth emerges from the ground in spring, forming an upright clump of leafy stems, averaging 90 cm in height and 50 cm in width. Its leaves may be opposite, but are often verticillate (inserted in whorls at regular intervals) in groups of three or four. Fairly narrow and lanceolate, 6 to 12 cm long and equipped with a short stalk, the leaf blade is deeply toothed and pure green in colour. It blooms in June-July. The inflorescences are very dense, upright racemes (clusters) that look like long, narrow spikes, densely set with very small flowers. They are tubular, intense blue and have four petals and two lighter coloured, protruding stamens. The blooms are melliferous and nectar-rich and give way to fruits in the form of spineless, heart-shaped capsules. The seeds self-seed spontaneously in the garden in wet soil.

 

Very easy to grow in ordinary, moist soil, this speedwell blends well with a variety of plants, especially plants for wet banks and produces beautiful summer displays in large flowerbeds and on the banks of a pond. Plant it with purple loosestrife, boneset, meadow-rues, meadowsweet (Filipendula) and Euphorbia palustris, for example. For a wilder looking style of garden, this elegant perennial forms a very successful association at the back of beds, with coneflowers and medium sized-grasses: pennisetum, compact miscanthus... Its flowers make for beautiful bouquets, along with white, pink or red roses, hydrangeas, buttercups, asters.

Flowering

Flower colour blue
Flowering time June to July
Inflorescence Spike
Flower size 30 cm
Bee-friendly Attracts pollinators
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Deciduous
Foliage colour dark green

Plant habit

Height at maturity 60 cm
Spread at maturity 30 cm
Growth rate normal

Botanical data

Genus

Veronica

Species

longifolia

Family

Scrophulariaceae (Plantaginaceae)

Origin

Central Europe

Product reference156521

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Planting and care

Sowing Veronica longifolia : February to June or September to October.

Sow seeds on the surface of a lightly packed, moist, special seed starting mix, in pots or trays. Seeds should be sown thinly. Do not cover very small seeds, but tightly press into the compost. Place a saucer underneath your pots or trays and water by filling the saucer with water. Place in a greenhouse or heated room, ideally between 13 and 16 °C. The compost should remain moist but should not be continuously wet. Germination takes 30 to 40 days. Move the seedlings to a cooler place after emergence.

Seedlings can be slow to grow. Prick out each plant once it has developed its first true leaves and transplant it into 7.5 cm diameter pots containing well-drained compost. Grow your seedlings in frost-free conditions until they are large enough to be planted outside.


Gradually acclimatize them to outdoor conditions for 10 to 15 days before planting out, once all risk of frost has passed. Plants sown in the autumn will spend the winter in frost-free conditions and will be planted out the following spring. Keep a distance of 30 to 60 cm between each plant.

Cultivation : Veronica longifolia is a reliable perennial although it does prefer a rich, clay soil, that tends to be alkaline (calcareous), deep and that never dries out. It likes damp environments and the proximity of water. It grows and flowers best in sunny conditions. Veronica longifolia can be planted out almost all year round in the garden, outside periods of frost and summer drought. Cut faded flower spikes as this will encourage repeat blooms. Being a rather gluttonous perennial, adding compost to the base of the plant every spring will help maintain its vigor. Do not use too much nitrogen fertilizer which will weaken the plant and make the stems bend and fall more easily. In spring, cut the plant down to its base. New foliage will emerge directly from the underground roots in the spring.

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Sowing period

Sowing period March to April
Sowing method Direct sowing, Sowing under cover
Germination time (days) 35 days

Intended location

Suitable for Meadow
Type of use Border
Hardiness Hardy down to -29°C (USDA zone 5) Show map
Ease of cultivation Amateur
Exposure Sun
Soil pH Neutral, Calcareous
Soil moisture Moist soil, Damp soil, argileux à tendance calcaire

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