Pittosporum: the tougher alternative to Photinia hedges

More and more amateur gardeners are frustrated by bare patches in their hedges and prying eyes from neighbouring properties. One former fashionable plant in particular is failing on a widespread scale. Landscape gardeners are therefore switching to a different, colourful evergreen that is considerably tougher and creates a dense screen.

Why the former hedge star is becoming a problem

Fungal disease devastates entire housing estates

Photinia, often known as red robin, was for many years considered the ideal answer: rapid growth, vivid red new shoots and quick privacy screening. Metres upon metres of Photinia were planted in countless new-build developments. The situation has now changed markedly.

The cause is a fungal infection, Entomosporium leaf spot, which is spreading extensively. It first produces small brown dots on the foliage. These spots enlarge, the leaves can no longer photosynthesise properly, and they eventually fall.

“Where dense red hedges once stood, there are now gaps, dried-out shoots and an unobstructed view of the patio and living room.”

The fungus benefits from mild winters and damp springs. This is precisely the type of weather becoming increasingly common in Central Europe. Nurseries and local authorities report that the disease is now appearing in almost every region. Anyone with a long hedge planted entirely with Photinia risks the fungus racing through the whole row like wildfire.

Costly sprays with limited results

Many garden owners try to tackle the problem by spraying fungicides, collecting diseased leaves and pruning harder. All of this takes time and money, with highly mixed results.

• Fungicide applications need to be repeated frequently
• Their effect is often limited when neighbouring hedges are also infected
• Heavy pruning temporarily destroys the privacy screen
• Collecting fallen leaves is laborious and still does not entirely prevent reinfection

Many amateur gardeners become discouraged when fresh spots appear after every spell of rain. They are looking for a plant that is less susceptible and does not constantly require chemical treatments.

Single-species hedges reveal their weaknesses

The decline of Photinia recalls the problems affecting Thuja hedges a few years ago. At the time, many people chose a single species – until drought, fungi and pests struck. A hedge made up of just one plant species is extremely vulnerable once a specific pest or fungus gains a foothold.

Garden and landscape contractors now report a sharp fall in demand for Photinia. Nurseries are expanding their range of alternative hedge shrubs. One name, in particular, comes up repeatedly: Pittosporum.

Pittosporum: the quiet winner among privacy-screening shrubs

Evergreen, dense and unexpectedly decorative

Pittosporum, often sold as pittosporum shrub, is attracting increasing attention from professionals. It is evergreen, compact and visually appealing throughout the year. Many varieties have bicoloured green-and-cream foliage, while others feature deep green leaves with a lightly lacquered sheen.

Annual growth is generally between 20 and 30 centimetres. This is sufficient to create a dependable privacy screen within a few years, without requiring the hedge to be cut back drastically every year.

“Pittosporum provides exactly the combination many people are missing: permanent foliage, a dense structure and appealing colours, without becoming a high-maintenance problem.”

This makes it ideal for terraced homes and small gardens: the shrub grows quickly enough to block unwanted views but remains easy to manage. Light, regular shaping produces an even, elegant hedge that does not become straggly.

Strong disease resistance lowers maintenance

Compared with Photinia, Pittosporum is notably more resilient against leaf fungi. So far, serious diseases have occurred only in isolated cases. This substantially reduces the need for fungicides, benefiting both the environment and household budgets.

Its care requirements remain manageable:

• One shaping trim each year in late spring or summer is usually enough
• Water deeply during dry spells, but not every day
• Apply a light feed in spring using organic fertiliser or a general garden fertiliser
• Choose a sheltered position that is preferably not in full shade

For anyone wishing to avoid chemical plant protection, Pittosporum is a reliable option. This advantage matters increasingly in densely built-up residential areas, where children or pets spend a great deal of time in the garden.

Why specialists still recommend mixed hedges

Despite these benefits, experts warn against blindly planting entire streets with Pittosporum alone. Experience with Thuja and Photinia shows that when one species is planted extensively, the likelihood of future large-scale problems rises.

Instead, gardeners recommend so-called mixed hedges. Pittosporum forms an important framework, but it is combined with other woody plants, for example:

• Elaeagnus (oleaster): tough, silvery shimmering foliage, well suited to dry positions
• Hazel: native, valuable for insects and birds, and produces nuts in autumn
• Cornus sanguinea (common dogwood): bright red winter stems and white flowers in early summer
• Cherry laurel varieties with high fungal resistance: providing a dark contrast within the hedge

“The more diverse the structure of a hedge, the lower the risk that a single pest will disable the entire privacy screen.”

How garden owners can plan the switch to a new hedge

Best planting times and a gradual changeover

Anyone replacing a disease-ridden hedge does not have to clear everything at once. A phased transition is often sensible. Start by removing the worst-affected sections, then plant new shrubs, such as Pittosporum, among the existing plants.

The best planting periods are:

Important: heavily infected leaves and branches from the old hedge should not be put on the compost heap; dispose of them with household waste instead. This reduces infection pressure in the garden.

Site, soil and variety selection for Pittosporum

Pittosporum prefers bright sites with some protection from cold easterly winds. Light partial shade is possible, but dense shade quickly results in loose growth and bare sections in the centre of the plant.

The soil needs to be free-draining, as the shrub tolerates waterlogging poorly. In heavy clay soils, sand or grit can help improve the structure. A mulch layer of composted bark or woodchip retains moisture in the soil and protects the root system.

Depending on the region, it is worth checking the frost hardiness of individual varieties. In mild areas along the Rhine or in large cities, more sensitive types may also be suitable, whereas hardier varieties should be selected at higher elevations.

More than privacy: benefits for climate and wildlife

Choosing Pittosporum and mixed hedges offers more than privacy. Dense, evergreen structures slow the wind, filter dust and give birds places to shelter. When combined with flowering shrubs such as dogwood or hazel, they create a lively garden boundary that supplies food and cover for many months.

At the same time, a varied hedge improves the garden’s microclimate. It retains moisture, protects against wind-driven drying and creates noticeably more pleasant corners of the plot on hot days. In densely built-up neighbourhoods, this can provide a small green buffer against urban heat islands.

Anyone unsure how Pittosporum will fit into their own plot should plant one or two specimens as a trial and observe their growth over one or two seasons. This makes it easier to judge which height, density and combinations suit their garden style and the surrounding neighbourhood.