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~ A garden set in the Wye Valley

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Tag Archives: Persicaria alpina (syn.Polymorpha)

Persicaria great and small

09 Wednesday Sep 2015

Posted by kate@barnhouse in Hardy perennials

≈ 23 Comments

Tags

Persicaria 'Kahil', Persicaria alpina (syn.Polymorpha), Persicaria amplexicaulis, Persicaria microcephela 'Red Dragon', Persicaria vacciniifolia

Besides ornamental grasses, I’m partial to robust hardy perennials that are easily propagated, low maintenance, and, work hard for their keep for as many months as possible. Persicaria is a firm favourite not least because the genus come in such a range of shapes, colours and sizes. Just like hats, there’s one for every occasion.

Pots

Persicaria vacciniifolia in pots

The rockery form Persicaria vacciniifolia AGM has fine glossy leaves and a neat habit, cloaking pots at the base of the stone wall of the lower terrace in front of the house it gives us something to look at from the kitchen table throughout the year.

Persicaria vacciniifolia flowers

Characteristic pink bell shaped flowers arranged in dainty candles are produced from late summer right up until the frosts.

Persicaria vacciniifolia February

In winter the wiry rusty coloured stems hug the side of the pots before sprouting new leaves along their length in spring.

Ground cover

Persicaria weaving beside drive

The winter garden of cornus and silver birch is a thicket from summer until spring, low growing Persicaria affinis carpets the ground suppressing the weeds. In early spring when the cornus is stooled it proves its worth as a trample proof plant.

Anemanthele and persicaria affinis Superba
Persicaria affinis ‘Superba’
Persicaria affinis 'Donald Lowndes'
Persicaria affinis ‘Donald Lowndes’

Both earned The Royal Horticuitural Society’s Award of Garden Merit, I can see why, even the arid edge of the drive doesn’t seem to faze this plant.

Specimen plants

Pesicaria Polymorpha White fleecy flowers June

To one side of the drive in the dry shade of a mature blue cedar is a large clump of a stunning form Persicaria polymorpha, recently renamed ‘alpina‘. The Giant fleece flower as it’s commonly known, is the Goliath of the family, a sub shrub standing at 5’ in height and producing amazing plumes from midsummer that start off glowing bridal white in June. At this stage they make dramatic cut flowers.

Pink flush August
Red bronze flush autumn

In late summer the white takes on a pinkish blush, then as autumn sets in pink fades through red and bronze. The kaleidoscopic display is accompanied by other changes of a less lovely nature, in hot sunny spells there is a whiff in the air of the sort that causes me to curse the neighbourhood tomcat. Perhaps this makes it a good back of border plant.

White Persicaria flowers with variegated Miscanthus
Autumn combination

At about the same height, Miscanthus sinensis ‘Cosmopolitan’ happily rubs shoulders with the persicaria, the grass props hollow stems up against the strong gusts of wind that sweep up the valley. I’m slowly learning to appreciate Latin names for being helpful as well as tongue twisting. Persicaria belong to the Polygonaceae family, from ‘poly’ and ‘gonu’ meaning ‘many knees’, and are named for stems that have numerous nobbly leaf joints. It delights me that those with hollow stems are brought to their knees by frosts saving me the bother of cutting them back.

Border blocks and drifts

Persicaria Rosea backed by Calamagrostis

Persicaria ‘Rosea’ with Calamagrostis ‘Karl Foerster’

Persicaria amplexicaulis is the perfect partner for ornamental grasses, modern breeding programmes are providing exciting new cultivars with variations of colour from pure white, pinks, orange and reds. Good new ones I’ve tried are the red ‘Taurus’ and ‘Fat Domino’, and a promising dwarf ‘Pink Elephant’.

Blue glow of pink Persicaria in evening light

On the main corner of the grasses terrace Periscaria amplexicaulis ‘Rosea’ glows in evening shadows and is a strong enough pink not to look washed out in direct sunlight.

Persicaria with orange day lilies

Persicaria ‘Rosea’ with Anemanthele lessoniana

As sizeable plants persicaria amplexicaulis occupies a good few feet of ground, excellent value for filling larger areas with drifts of late summer colour.

Grasses terrace round bed Stipa persicaria gravel Calamagrostis August

At the other end of the terrace is a crimson blaze of Persicaria amplexicaulis ‘Firetail’. A few plants have quickly filled the space and there’s a steady supply of seedlings. This is as close to being a nuisance as any of the species I grow get, otherwise they stay where they are put albeit in roomy quarters. Others that don’t seed are easily propagated from basal or stem tip cuttings, the latter can be rooted in water.

Persicaria Firetail Stipa gigantea

Persicaria ‘Firetail’ with Stipa gigantea

Persicaria is beloved by bees, hover flies, butterflies and wasps. At this time of year there’s a whiff of caramel in the air thanks to the young Cerdiphyllum (on the left) around which ‘Firetail’ is planted, perhaps this makes it a magnet for wasps?

Persicaria planted beside gravel path

Whatever the allure, the corner thrums angrily with swarms of the ‘drunk and jobless’ wasps and we avoid using this narrow path for a few weeks.

Mixed planting hydrangea Persicaria and Miscanthus

Seedlings from ‘Firetail’ weave among grasses and hydrangeas in a newly planted border designed to conceal the fencing and gate posts at the top of the drive. In time some of the planting in this bed may need thinning out, while we wait for the shrubs to establish it’s a pretty confection.

Foliage

Chevrons
Chevrons on leaves red dragon

Some species have less showy flowers but wonderful livery such as the well behaved and choice cultivar Persicaria microcephela ‘Red Dragon’. The silvery chevrons on a red background are either more or less pronounced depending on the amount of sun/shade. I like the way the gangly stems climb through neighbouring shrubs and I’m grateful that it hasn’t mugged Geranium ‘Lambrook Gillian’.

Persicaria red dragon flops by July

The unsupported mass planted at the bottom of the orchard are inclined to sprawl like bar room brawlers across the border by late July. I’m told they could be given the Chelsea chop between mid May and early June, and they’ll need to be to spare the day lilies from being smothered next year.

February shadow light bulbs

Unlike a lot of the ornamental grasses and many of the hardy perennials in the garden, persicaria isn’t renowned for winter interest unless you like twiggy bits and pieces. (I do.)

Persicaria campanulata

Until last February I hadn’t noticed the fine rosettes of new leaves of Persicaria campanulata, rimed with frost they caught my eye.

A new addition to my wish list

Persicaria kahil

Apart from the creamy white racemes of bell shaped flowers, Persicaria ‘Kahil’ doesn’t resemble any other persicaria I’ve encountered. I’ve not been able to find out very much about this plant other than it seems a bit of a rarity. The RHS lists stockists, the closest to me is Cotswold Garden Flowers. Looking demure and so charminginly displayed at Mulberry House garden on a recent Goodrich Gardens NGS Open Day, I’m sure it was winking at me.

 

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