Duizendknoop 'Firetail'

Persicaria amplexicaulis 'Firetail'

Engels: Red bistort 'Firetail'

perennialPolygonaceae

Duizendknoop 'Firetail' (Persicaria amplexicaulis 'Firetail') is a perennial from the Polygonaceae family that grows up to 120cm tall. This plant thrives in full sun to partial shade and requires low maintenance. Blooms in summer and late summer and autumn with red flowers and attracts bees and butterflies.

Hoogte

100–120 cm

Breedte

60–90 cm

Zonligging

full sun, partial shade

Waterbehoefte

moderate

Grondsoort

loam, clay soil

Onderhoud

low maintenance

Bloeitijd

summer, late summer, autumn

Bloemkleuren

red

Ecologische waarde

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Care tips

Planting

Persicaria amplexicaulis 'Firetail' thrives in full sun or partial shade, making it adaptable to a range of garden positions. It performs best in moisture-retentive loam or clay soil, so avoid dry, sandy spots. Before planting, dig over the soil to a spade's depth and incorporate plenty of organic matter—well-rotted compost or manure—to improve structure and water retention, especially if your soil is on the lighter side. Plant 'Firetail' in March, April or May for spring planting, or in September and October for autumn planting. Both windows work well; autumn planting allows roots to establish over winter, while spring planting suits colder or wetter gardens where drainage may be an issue in winter. Dig a hole roughly twice the width of the root ball and the same depth. Position the plant so the crown sits level with the surrounding soil—planting too deep can lead to rot. Space plants 60 cm apart; 'Firetail' will spread to 60–90 cm over time and benefits from room to develop its clump-forming habit without crowding neighbours. After planting, firm the soil gently around the roots to eliminate air pockets, then water thoroughly to settle the plant in. Apply a 5 cm layer of organic mulch such as garden compost or bark chips around the base, keeping it clear of the crown itself. This conserves moisture, suppresses weeds, and feeds the soil as it breaks down. Water regularly during the first growing season until the plant is fully established, especially in dry spells.

Pruning

Persicaria amplexicaulis 'Firetail' requires very little pruning, which is part of its appeal as a low-maintenance perennial. The main task is cutting back the old stems once flowering has finished and the foliage has died back. The best time to do this is in late autumn (November) after the first frosts have blackened the leaves, or in early spring (March or April) before new growth emerges. Many gardeners prefer to leave the spent flower spikes standing over winter; the dark seedheads provide structure and interest in the dormant garden and offer food and shelter for wildlife. When you do cut back, use a pair of sharp secateurs or garden shears to remove all the old stems down to ground level, just above the crown. The plant will reshoot vigorously from the base in spring. There's no need for complex shaping or thinning—simply clear away the previous year's growth in one go. If clumps become very large or start to encroach on neighbouring plants, you can lift and divide them in spring. Dig up the whole clump, split it into smaller sections using a spade or two forks back-to-back, and replant the healthiest portions, discarding any woody or exhausted central material. During the growing season, deadheading is not necessary. 'Firetail' produces a long succession of slim, bottlebrush-like red flower spikes from summer through to autumn, and they keep their colour well even as they fade, so there's no urgency to remove them for the sake of appearance or to encourage further blooms.

Maintenance

Once established, Persicaria amplexicaulis 'Firetail' is remarkably undemanding. It has moderate water needs and copes well with typical rainfall in temperate climates, but during prolonged dry spells in summer—especially if planted in full sun—water deeply once or twice a week to keep the soil evenly moist. Clay and loam soils retain moisture well, which suits this plant perfectly. Avoid waterlogging, though established clumps tolerate occasional wet conditions better than many perennials. Feed in spring to support the season's vigorous growth and long flowering period. In March, April or May, apply a general-purpose granular fertiliser such as blood, fish and bone or a balanced slow-release feed around the base of the plant, following the packet rate. Alternatively, a 5 cm top-up of garden compost or well-rotted manure in early spring provides a steady nutrient release and improves soil structure. Avoid high-nitrogen feeds later in the season, which can promote soft growth at the expense of flowers. 'Firetail' is fully hardy across zones 4–9 and needs no winter protection in the UK, Netherlands, Belgium or Ireland. The crown will survive hard frosts without issue. Mulch lightly in autumn to conserve moisture and suppress weeds, but keep mulch away from the crown to prevent rot. Pests and diseases are rarely a problem. Slugs and snails may nibble young spring shoots, so scatter organic slug pellets or use barriers if damage is severe. Powdery mildew can occasionally appear on foliage in hot, dry summers, but it's largely cosmetic and doesn't significantly harm the plant. Good soil moisture helps prevent it.