Shrubs

Rhododendrons are magnificent evergreen shrubs that produce enormous trusses of flowers in spring — from delicate whites and pinks to vivid reds, purples, and even yellows. They're woodland plants that thrive in dappled shade, acidic soil (pH 4.5–6.0), and sheltered conditions. On neutral or alkaline soil, they simply won't thrive — the leaves turn yellow (chlorosis) and the plant slowly declines. In such conditions, grow compact varieties in large containers filled with ericaceous compost, watered with rainwater. 'Cunningham's White' and 'Christmas Cheer' are among the hardiest large hybrids. For smaller gardens, the 'yakushimanum' hybrids are compact, dome-shaped, and incredibly floriferous. Deadheading after flowering (snap off the spent flower trusses carefully, without damaging the new growth buds beneath) improves flowering the following year. Rhododendrons have shallow root systems — mulch annually with leaf mould or bark to keep the roots cool and moist.

Holly is one of Britain's most iconic native evergreens — its glossy, spiny leaves and bright red berries are synonymous with Christmas. It makes an excellent hedging plant (dense, spiny, and virtually impenetrable to intruders) and a fine specimen tree. Holly is dioecious, meaning you need both male and female plants for berries — the female produces the berries, but only if a male is nearby for pollination. Confusingly, some varieties have misleading names: 'Golden King' is female (with berries) and 'Golden Queen' is male. 'J.C. van Tol' is a useful almost self-fertile variety. Holly tolerates heavy shade, pollution, coastal exposure, and most soil types — it's one of the toughest plants in the British garden. It can be pruned hard and topiarised into shapes. The berries provide vital winter food for birds, particularly thrushes and waxwings. Holly grows slowly, so buy the largest plant you can afford for hedging purposes.

Hydrangeas are among the most popular garden shrubs in the UK, valued for their enormous, long-lasting flower heads in shades of blue, pink, purple, and white. The flower colour of mophead (Hortensia) and lacecap types is famously influenced by soil pH: in acidic soil (below pH 5.5) they produce blue flowers; in alkaline soil, pink. To keep blue flowers blue, add aluminium sulphate or use ericaceous compost; to keep pink flowers pink, add lime. White varieties stay white regardless. 'Nikko Blue' and 'Endless Summer' are popular blue varieties; 'Madame Emile Mouillère' is the best white. Hydrangeas prefer partial shade — hot afternoon sun scorches the leaves and flowers. They need consistently moist soil and will wilt dramatically in drought (though they recover quickly after watering). Prune mophead and lacecap types in spring by cutting just above the first pair of healthy buds below last year's flower head. The dried flower heads provide winter structure — leave them on until spring.

Azaleas are essentially compact, often deciduous rhododendrons that produce an astonishing abundance of flowers in spring. The deciduous types (Mollis and Knap Hill hybrids) are particularly spectacular, covering themselves in flowers before the leaves emerge, and many offer superb autumn foliage colour too — giving you two seasons of interest. They share the same acidic soil requirement as rhododendrons (pH 4.5–6.0), and on alkaline soil must be grown in containers of ericaceous compost watered with rainwater. Japanese azaleas are evergreen, compact, and incredibly floriferous — 'Palestrina' (white) and 'Hino Crimson' (red) are classics. They're shade-tolerant and perfect for underplanting beneath trees. Azaleas have shallow root systems, so mulch annually and don't cultivate around them. They need very little pruning — just remove dead wood and shape lightly after flowering if necessary. Feed with an ericaceous fertiliser in spring.

Heather (Calluna) is the plant that paints the moors purple in late summer and brings the same wild beauty to garden settings. These low-growing evergreen shrubs form dense, weed-suppressing mats of tiny leaves, topped with spikes of small flowers in shades of purple, pink, red, and white from August to November. They need acidic, well-drained soil and an open, sunny position. On alkaline soil, grow in raised beds or containers of ericaceous compost. Combined with winter-flowering heaths (Erica carnea and E. × darleyensis, which tolerate alkaline soil), you can have heather in flower every month of the year. Heathers look best planted in sweeping drifts of 5–7 plants of the same variety, with different varieties blending into each other. Clip annually with shears after flowering, removing the faded flower spikes and a little of the leafy growth — this prevents the plants becoming leggy and bare at the base. 'Firefly' has striking russet foliage that changes colour through the seasons.

Box is the classic plant for hedging, topiary, and formal garden structure — its tiny, dense, evergreen leaves respond beautifully to close clipping. It's been used in British gardens for centuries to create low hedges around herb gardens and parterres, geometric shapes, and elaborate topiary figures. However, box blight (Cylindrocladium buxicola) has become a serious problem in the UK since the early 2000s, causing brown patches and defoliation. Choose blight-resistant varieties like 'Faulkner' where possible, ensure good air circulation, and avoid overhead watering. If blight strikes, cut out affected growth, disinfect tools, and consider replacing badly affected plants with alternatives like Ilex crenata (Japanese holly), Euonymus japonicus 'Microphyllus', or Pittosporum 'Golf Ball'. Box grows slowly — about 15cm per year — so buy the largest plants you can afford for hedging. Clip in June (Derby Day is the traditional timing) and optionally again in September for a crisp finish through winter.

Fatsia japonica is one of the best architectural evergreen shrubs for shady gardens, producing enormous, glossy, deeply-lobed palmate leaves that create an exotic, tropical look. It flowers in autumn, producing unusual spherical clusters of creamy-white flowers followed by small black berries — these late flowers are valuable for pollinators. Fatsia thrives in deep shade, dry shade, and even in pots in shady courtyards where little else will grow with such presence. It tolerates pollution and salt spray, making it excellent for urban and coastal gardens. Despite its exotic appearance, it's remarkably hardy — established plants tolerate temperatures down to -10°C. It reaches 2–3 metres in time but can be pruned hard in spring if it gets too large — it regenerates willingly from old wood. The variegated form 'Spider's Web' is less vigorous and has elegant white-splashed leaves. Keep the large leaves clean by washing with a gentle hose — this improves the plant's health and appearance.

Hebes are compact, versatile evergreen shrubs from New Zealand that have become enormously popular in UK gardens for their neat habit, attractive foliage, and abundant flower spikes. They range from tiny, bun-shaped alpine types to large, leafy shrubs, but the medium-sized varieties (60–100cm) are the most useful for mixed borders and containers. 'Great Orme' (pink spikes), 'Midsummer Beauty' (lavender-purple), and 'Red Edge' (short red spikes, grey-green foliage) are all reliable. As a general rule, the smaller the leaves, the hardier the plant — the large-leaved species are more vulnerable to cold winters. Most hebes tolerate coastal exposure, pollution, and relatively poor soil. Prune lightly after flowering to maintain shape, and remove any frost-damaged growth in spring. They're short-lived plants by tree and shrub standards (10–15 years), but easily propagated from semi-ripe cuttings in late summer. Their nectar-rich flowers are excellent for bees and butterflies.

Common jasmine is a vigorous, twining climber treasured for its intensely fragrant, star-shaped white flowers that scent the air on warm summer evenings. It's a classic choice for growing over pergolas, arches, and around doorways where its perfume can be enjoyed. In sheltered spots across much of southern and central England, it's semi-evergreen; in colder areas it drops its leaves in winter. It flowers from June to September on the current season's growth, with clusters of small, pure white blooms among pinnate, bright green leaves. Plant in a warm, sheltered position — a south or west-facing wall is ideal — in well-drained soil. It can grow 8–12 metres if left unchecked, but responds well to pruning after flowering to keep it within bounds. Winter jasmine (Jasminum nudiflorum), a different species with yellow flowers on bare stems from November to March, is fully hardy and tolerates north-facing walls. Common jasmine benefits from a thick mulch over the root zone in winter for the first few years until established.

Hardy hibiscus (Hibiscus syriacus) brings an exotic, tropical look to UK gardens with large, showy, funnel-shaped flowers in shades of blue, purple, pink, red, and white from August to October. Despite its exotic appearance, it's surprisingly hardy across most of the UK, tolerating temperatures down to -15°C once established. It forms a deciduous shrub or small tree, typically 2–3 metres tall, and is one of the last shrubs to leaf out in spring — don't panic if it looks dead in April, it's simply late to wake up. It needs a warm, sunny, sheltered position to flower well — a south or west-facing wall is ideal. Plant in well-drained soil and avoid exposed, windy positions. It's drought-tolerant once established and rarely troubled by pests. 'Oiseau Bleu' (syn. 'Blue Bird') is the most popular variety, with large violet-blue flowers with a dark eye. 'Diana' produces pure white flowers. 'Woodbridge' has large, rich pink blooms. Pruning is minimal — simply remove dead or crossing branches in spring. Young plants benefit from winter protection (mulch over the roots) for the first 2–3 years.

Buddleia — the butterfly bush — is one of the most wildlife-friendly shrubs you can grow, producing long, conical panicles of honey-scented flowers that attract butterflies, bees, and moths in huge numbers from July to September. On a warm summer afternoon, a buddleia in full flower can be covered with peacock, red admiral, painted lady, and comma butterflies. It's incredibly easy to grow — tolerating poor soil, drought, pollution, and neglect. It will even grow in cracks in walls and paving, as anyone who has seen it colonising railway embankments and derelict buildings will know. In gardens, it grows quickly to 3–4 metres but should be pruned hard every March — cut all the previous year's growth back to a low framework of 30–60cm. This seems drastic but produces stronger growth and larger flower panicles on the new wood. Without pruning, plants become leggy, top-heavy, and flower poorly. 'Black Knight' (deep purple) and 'Royal Red' (magenta) are classic varieties. 'White Profusion' has elegant white panicles. The compact 'Buzz' series reaches only 1.2m, ideal for smaller gardens and containers. B. × weyeriana 'Sungold' produces unusual orange-yellow flower balls. Deadhead spent flower panicles to encourage a second flush and prevent self-seeding (buddleia can be invasive in wild areas).

Clematis are the queens of climbing plants, offering flowers in every season and an incredible range of forms and colours. There are over 300 species and thousands of cultivars, providing options for every garden situation. Large-flowered hybrids like 'Nelly Moser' (pink-striped), 'The President' (deep purple-blue), and 'Niobe' (deep red) produce spectacular blooms 12–15cm across in summer. Late-flowering C. viticella varieties ('Étoile Violette', 'Polish Spirit') are exceptionally healthy and flower prolifically from July to September. Spring-flowering C. montana covers vast areas with cascading white or pink flowers. Winter-flowering C. cirrhosa provides scented, nodding, cream bells from December to February. The key to success is understanding the three pruning groups: Group 1 (spring-flowering) — prune after flowering; Group 2 (early-summer large-flowered) — light prune in February; Group 3 (late-flowering) — hard prune to 30cm in February. All clematis like their roots cool and shaded but their tops in sun — plant deeply (10cm deeper than the pot) and shade the root area with low-growing plants or a flat stone. They climb by twining leaf stalks, so need thin supports like wires, trellis, or netting rather than thick posts.

Wisteria is arguably the most spectacular flowering climber hardy enough for UK gardens, producing cascading racemes of fragrant, pea-like flowers in shades of violet-blue, purple, pink, or white in May and June. A mature wisteria in full bloom, dripping with 30cm-long flower clusters against a warm stone wall, is one of the most breathtaking sights in the gardening world. It's a vigorous, twining climber that can cover a large wall, pergola, or entire building — it's not a plant for a small trellis. Chinese wisteria (W. sinensis) twines anticlockwise and produces all its flowers simultaneously in a dramatic burst; Japanese wisteria (W. floribunda) twines clockwise and has longer racemes that open gradually from the top. Both are fully hardy and long-lived — plants can survive for over 100 years. The key to flowering is correct pruning, done twice a year: in July–August, cut back whippy side shoots to 5–6 leaves from the main framework; in January–February, shorten these same shoots further to 2–3 buds. This concentrates energy into flower buds rather than vegetative growth. Buy grafted plants (not seed-raised, which may take 15+ years to flower). 'Prolific' and 'Amethyst' are excellent W. sinensis varieties; W. floribunda 'Multijuga' has the longest racemes at up to 1 metre.