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Water speedwell

Veronica anagallis-aquatica · Plantaginaceae

The gardener's calendar

The right move for September

Ideal time to plant water speedwell: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

JFMAMJJASOND Planting

ID card

Common name
Water Speedwell
Family
Plantaginaceae
Type
Perennial aquatic plant
Flowering
April to September, pale blue flowers
Adult size
10 to 40 cm in height
Foliage
Deciduous, semi-aquatic
Hardiness
Very hardy, down to -15°C
Origin
Temperate Europe, Asia

Care

Immersion and hydrology

Water Speedwell thrives when partially or fully submerged in fresh water, in a pond or calm watercourse. Maintain a water depth of 10 to 30 cm depending on the variety. Tolerate seasonal fluctuations and prefer clear water, without prolonged stagnation.

Light and sunlight

Place the plant in full sun to partial shade for optimal flowering. At least 4 to 5 hours of direct daily light encourage growth and flower production. It also tolerates partially shaded areas at the edges of ponds.

Substrate and rooting

Favour rich, loamy or silty soil at the bottom of the pond. Plant in an aquatic growing container filled with heavy potting soil or specialized substrate, stabilized by pebbles. Avoid soil that is too sandy or too compacted.

Nutrition and nutrients

In a pond, nutrients generally come from natural organic decomposition. If growth is slow, moderately add an aquatic fertilizer in spring. Avoid overdosing, which promotes eutrophication.

Cutting and maintenance

Trim or remove faded stems and dead leaves in late winter to promote branching. Pinch back the tips in spring to achieve a more compact and bushy shape. Limit invasive spread by moderately cutting back stolons.

Health and pests

Very robust in healthy aquatic environments. Watch for filamentous algae and organic debris that may affect rooting. Stagnant or polluted water promotes rot; maintain good water circulation and acceptable water quality.

Did you know?

Water Speedwell was once used in traditional herbalism as a purifier and remedy for respiratory complaints, though these uses are no longer recommended without expertise. Its Latin name 'Veronica' is said to be inspired by Saint Veronica, while 'anagallis-aquatica' literally means 'resembling pimpernel and living in water', reflecting its dual nature as a riparian plant.

Where to buy it

Best planted in spring or autumn, away from frost and heatwaves. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September, October.

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Tips generated and checked by Viridia — adapt them to your local climate.