5 essential … low growing shrubs for ground cover

Whilst we often think first of perennials when looking for ground cover plants, there are many low growing shrubs that do the job quickly and effectively and that can provide a longer season of interest and more spread for your money.

 
Cotoneasters are wonderfully versatile shrubs which can be evergreen or deciduous and vary widely in size and form.  However, one thing that they all have in common is their long season of interest and easiness to grow.  Cotoneaster conspicuus ‘Decorus’ is a low growing, semi-evergreen cotoneaster with very small, glossy dark green leaves, an arching habit and a mature height and spread of 1-1.5m x 2m.

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The branches are smothered in small white flowers for a long period in summer which in autumn are followed by bright red berries.  Any well-drained soil and any aspect will suit this Cotoneaster which makes it especially useful in dry, shady spots, but it may need protection from cold, drying winds in colder areas.

Nandina domestica ‘Firepower’ provides neat, colourful ground cover with a long season of interest in a sun or part shade and looks great planted in groups.  It is a dwarf form of heavenly bamboo with a compact, rounded form and shiny mid-green leaves that turn fiery shades of red and copper in autumn.

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Additional autumn interest is provided by the glossy red berries while in mid-summer conical clusters of tiny white flowers appear amongst the leaves.  Frost hardy (it may need some protection in colder areas), it is not fussy about soil type as long as it is moist and well-drained.
Garden tip: lightly cut back any shoots that are spoiling the overall shape in mid to late spring.

As well as providing wonderful fast growing ground cover in full sun or partial shade, Salvia officinalis ‘Purpurascens’, or purple sage, also scores highly on good looks, aroma and usefulness.  The highly aromatic young leaves emerge a deep reddish purple maturing to a lovely soft grey/green with a mauve hue (the hotter and sunnier the conditions the deeper the purple colouring).  Purple sage combines particularly well with any purple/lilac/mauve flowered plants such as lavender or nepeta, and bees love sage’s own beautiful lilac/mauve flowers that appear over a long period during May to July.

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Purple sage leaves have the same culinary uses as common sage including making a tasty, astringent tea which has a variety of medicinal properties and the edible flowers look really lovely scattered over summer salads.  Sage is fully hardy as long as it is grown on well-drained soil that is not acid and it makes a good container plant.  Height and spread: 100cm x 80cm.
Garden tips: Prune plants lightly after flowering and in spring to keep them bushy.  Mature and/or leggy plants can be pruned hard in spring (when it can look a bit shabby after winter), but take some cuttings as insurance.  Sage is prone to becoming woody and is best replaced every 4-5 years.

Viburnum davidii is a good looking shrub for all seasons with a low growing, naturally domed shape that makes for great ground cover beneath other taller shrubs of more vertical habit.  The large leathery oval leaves are dark green and heavily veined and held on red tinged stems.

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In May flattened heads of tubular white flowers appear, followed later in the year by startling metallic turquoise berries on bright red stems (NB: cross-pollination must occur for fruits to be produced).  A must for woodland borders, Viburnum davidii is also happy in full sun and on any moderately fertile, well-drained and moist soil.  Height and spread: 1m x 1-1.5m.
Garden tips: Little to no pruning required.  If pruning is carried out, cut back to strong stems or to plant base to retain domed shape.

It’s hard to beat a good ground cover rose for sheer floriferousness and, well, ground covering.  Rosa ‘Kent’, one of the ‘Towne and Country’ series, is a repeat-flowering, reliable performer that forms a small, neat mound and looks good over a long season.

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Slightly scented, semi-double white flowers with a cream flush open in great abundance from July to September, set off perfectly by the shiny dark green leaves and followed in autumn by small red hips.

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Rosa Kent thriving in a mixed border in an exposed garden – used here to provide flowering interest & structure without blocking the views

Requires a fertile, humus rich, moist soil and full sun to light shade.  It makes a good patio plant in a container and the flowers, which stand up well to rain, are also good for cutting.  Height and spread: 1m.
Gardening tips: Little annual pruning required.  Remove dead, diseased, damaged or congested branches to the base in late winter.  If plants grow too large for their allotted space, prune vigorous branches by one third and prune side shoots to two or three buds from main stem.

 

Photo credits:  Janet Bligh

5 essential … small grasses

This month’s focus is on small grasses, a group of plants that between them provide a long season of interest, striking focal points, a wonderful foil to other plants and contrast and movement in almost any aspect and planting scheme.  At a time of year when gardens can start to lose their oomph, grasses are invaluable to keep the interest going well into autumn.

Deschampsia cespitosa ‘Goldtau’ is one of the most versatile and lovely grasses around.  In early summer, silvery, reddish-brown flower spikes emerge from the dense mounds of slender, mid-green arching leaves and mature to form clouds of finely textured golden seed heads that last well into autumn. All this and easy too: Deschampsia despitosa ‘Goldtau’ is evergreen, fully hardy and thrives in full sun or partial shade and neutral to acid, dry to moist soil.

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Deschampsia Goldtau at Bury Court in Hampshire

Plant front of border in groups at the base of taller perennials for best effect.  Top tip: remove faded flower heads in late winter before new growth appears and cut back any tatty looking foliage to the base at the same time.  Height and spread when flowering: 75cm x 75cm.

One of the smallest, but the most dramatically coloured of all the ornamental grasses is Imperata cylindrical ‘Rubra’, or Japanese blood grass.  It was grown in Japan as a companion to bonsai for more than a century before being brought over to Europe where it got its common name from the intense dark red colour of its leaves. These emerge quite late in the season and are initially lime green with dark red tips, but as summer progresses the colour spreads through the whole leaf and becomes more vivid and translucent.

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Imperata cylindrica Rubra planted en masse for maximum effect (Oudolf Field, Somerset)

Colouring is best when grown in full sun, but this slow-growing grass will also grow well in light shade, doing best on good garden soil which does not dry out.  It is happy in containers too, where it will make an eye-catching feature, as long as it is kept well-watered.  Height and spread: 40cm x 30cm.
Gardening tips: cut down to the ground in late February.  In colder areas roots should be protected with a thick mulch of straw or well-rotted compost.

Another strikingly coloured grass is Festuca glauca (Blue fescue), an evergreen species forming neat, spiky clumps of intensely blue/green foliage with dainty blue flower stems in summer that fade to pale straw.  Best colouring develops in full sun on thin, dry soils and good drainage is essential (but make sure to water well whilst plants are establishing).

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Festuca ‘Elijah Blue’

Festuca glauca looks particularly good if grown as an accent plant, in groups or individually, in a Mediterranean style planting or gravel garden or in a planter.  Height and spread: 30cm x 20cm.  There are various cultivars available, ‘Intense Blue’ and ‘Elijah Blue’ being amongst the best coloured.
Gardening tips: Remove dead foliage in winter by combing through leaves with the fingers.  This is a fully hardy grass, but may need replacing every few years as it can start to become tatty looking.

Stipa tenuissima (full name Stipa tennuifolia syn. S. tenuissima) is an undemanding, versatile grass that is perfect for adding light and movement to a gravel garden or perennial border and also works well in containers.  Tight upright clumps of pale yellow-green leaves are accompanied in summer by masses of silky, arching silver/green flowers that mature to golden buff and sway with the slightest breeze.

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Stipa tenuissima looks very effective in group plantings and is a great addition to a new perennial border where it quickly fills out to provide a wonderful foil for plants such as Achilleas, Salvias, Echinacea and Alliums.
Likes a medium to light, moderately fertile, well-drained soil in full sun.  Height and spread: 30cm x 60cm.
Gardening tips: cut down to the ground in early spring before new foliage appears.  Warning: Stipa tenuissima is very free seeding and will tend to invade adjacent graveled spaces or paved areas with soft pointing.

In contrast to Stipa tenuissima which thrives in full sun and is at its peak in summer, Sesleria autumnalis is a cool season grass for shady areas which puts on new growth in spring and autumn and tends to die back a little in summer.  This summer lull, however, is only the precursor to its autumn glory when the grey/green foliage takes on a fresh lime green hue and the silvery grey flowers open to reveal silky white stamens that shimmer in the breeze.

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Evergreen and fully hardy, Seslaria autumnalis provides year round interest and striking focal points when planted along the edge of a woodland path or threaded through a shaded border. It is easy to grow, thriving on alkaline soil, but happy on any and tolerates drought, but not winter waterlogging.
Gardening tips: cut back to the base in early spring to encourage new growth and maintain good shape and habit.

 

Photos:  ©Janet Bligh