Firethorn

Family

Rosaceae

Habit

Shrub

Height

4 m

Spread

4 m

Growth

fast

Lifespan

25 years

First yield

after 3 years

Hardiness

zone 6–9

Shade tolerance

partial shade

Soil

Sand, Silt, Loam

Soil moisture

very dry – very wet

pH

6 – 7.5

Edible: Firethorn berries are not fruit for eating out of hand: the flesh is mealy, dry and almost tasteless, but rich in pectin and acid. It is free of cyanogenic compounds — those sit in the seeds alone, which release prussic acid when chewed and are therefore not eaten. In the kitchen firethorn counts where setting power and colour are wanted: the fruit is cooked, pushed through a sieve and made into jelly or purée, often blended with more aromatic fruit such as apple, rosehip or quince. Sieving removes the seeds at the same time. Picking starts in September; the fruit hangs into winter and softens with frost.

Other uses: Firethorn's main use beyond the fruit is structural. Its dense, thorn-armed growth makes an impenetrable boundary hedge that neither deer nor people push through, and it takes shearing without complaint. Trained flat against a wall or a wire frame it works as an evergreen espalier that covers facades and bare gable ends and carries fruit even in narrow planting strips. Because it holds dry, stony ground and roots as a heart-rooter, it is used to stabilise embankments and slopes, and it tolerates urban conditions — road salt aside, it copes with compacted soil, reflected heat and exhaust. In garden design it is valued as a bird protection shrub: evergreen cover plus thorns plus winter fruit in one plant.

Site: Firethorn is a host plant for fireblight, a notifiable bacterial disease. In fruit-growing regions and near pome-fruit orchards planting it may therefore be restricted — check the rules of your federal state or canton before setting it. Its thorns are long and hard: it is out of place beside paths, seating and play areas, but at a boundary it makes one of the most effective impenetrable hedges there is. Birds carry the seed far, and seedlings germinate regularly under perches. The fruit drops in winter and stains paving and terrace surfaces. Care: It takes hard pruning. Do the main cut in late winter and corrections in August once the fruit clusters show — the berry display sits on two-year-old wood, so shearing formally every year takes the crop away from the birds. In persistently wet conditions firethorn scab attacks leaves, shoots and fruit; airy positions and scab-resistant cultivars are the answer. If shoot tips suddenly blacken and hook over, suspect fireblight: do not cut it yourself, notify the responsible authority. It needs almost no feeding and takes drought well. Prune only with stout gloves and eye protection.

True-to-type propagation works vegetatively only. Semi-ripe cuttings in July and August, about ten centimetres long and stripped at the base, struck in sandy compost and kept evenly moist in part shade, root in six to ten weeks. Hardwood cuttings of ripened wood in late autumn also succeed, only more slowly. Layering is the surest method: peg down a low shoot in spring, wound it at the contact point, weight it and sever it the following year. Seed is possible but laborious and not true to type — the seeds need cold to germinate and take two to three months of cold moist stratification after the pulp is rubbed off. Root suckers occasionally supply ready-made young plants.

Firethorn is not a native shrub, but it delivers measurably. Around thirty wild bee species have been recorded at its May and June flowers, none of them specialists; nectar and pollen rate as moderate. As caterpillar food it barely registers — a single butterfly or moth species uses it. Its weight lies in the winter half of the year: the fruit persists into February and is cleared by blackbirds, thrushes and greenfinches when little else is left. Then there is the structure — a dense, evergreen, thorn-armed framework giving small birds cover from cats and sparrowhawks and a safe nesting place. Anyone looking for caterpillar food should add native shrubs; as a winter feeding and shelter hedge it is hard to replace.

Special characteristics: evergreen+thorny (impenetrable protective hedge, bird nesting site); fruit borne on 2-year-old wood pruning date decides the crop; persists into February bird food in the lean season; fireblight host notifiable, planting may be restricted in fruit-growing areas; hardy to -23°C; cultivars with red, orange or yellow fruit, prefer scab-resistant ones;

Southeastern Europe and Asia Minor to the Caucasus. Scarlet firethorn centres naturally on the Balkan peninsula, Italy and the northern Mediterranean coast, and its range extends through Turkey into the Caucasus. It reached Central Europe in the seventeenth century as an ornamental shrub, though the genus grew here already in the Tertiary. Today it is planted in gardens and parks from the coast to the Alpine foothills and escapes locally wherever birds carry the seed — along railway embankments, walls and scrub margins. So far it is not regarded as a problematic neophyte.

A shrub of sub-Mediterranean scrub and woodland margins: open oak woodland, scrubbing-over dry slopes, rock swards and stony pasture on calcareous, free-draining ground. It holds its place where the soil dries out in summer and full sun reaches it all day, and copes with shallow, stony soils. Waterlogging is the one site factor it will not take. In Central Europe it finds comparably warm, dry conditions on south-facing walls, railway land and waste ground; hardy to about minus 23 degrees, it also persists in harsh situations.