Burning Bush (Dictamnus): Growing and How to Handle It Safely

Growing burning bush – alkaline well-drained substrate, partially shaded position, moderate watering, warmth

In brief: Burning bush (Dictamnus albus) is a slow-growing perennial that flowers pink or white and needs fertile, heavier but well-drained soil and a sunny to lightly partially shaded spot. From sowing to flowering takes around four years. The sap of the plant is phototoxic; protect your skin when working with it.

Latin name	Dictamnus albus, rue family
Height	40–100 cm
Flowering	May–June, about 14 days
Soil	fertile, heavier, well-drained, does not tolerate waterlogging
To first flowering	around 4 years from sowing
Safety	the sap is phototoxic, use gloves

Burning bush is among the most striking perennials of European gardens, even though because of its slow growth and more demanding sowing hardly anyone grows it. Here it grows wild rarely, in light heat-loving oak woods and on steppe slopes of warmer areas, and it is protected as an endangered species, so never collect it in the wild; only buy seeds or plants of nursery origin.

The genus Dictamnus belongs to the rue family, like common rue, and like it contains strong aromatic essential oils. It is distributed patchily from central and southern Europe through south-western and central Asia to China. In a number of European countries, for example in Poland, Germany, Switzerland or Hungary, it is, as here, among the endangered or critically endangered species.

Why burning bush is called burning bush

The whole plant, most of all the flowers and ripening fruits, produces strong aromatic essential oils. On a hot, windless summer day so much of them accumulates around the plant that they can be set alight; the little flame then for a moment licks over the plant without damaging it. This phenomenon earned it folk names such as burning bush or Moses' bush. Contact with the essential oil may in more sensitive people cause a phototoxic skin reaction; we write about this in more detail below in the safety section.

Varieties and flower colour

Apart from flower colour, the individual forms and cultivars differ little; the height, flowering time and position requirements remain practically the same, so the choice is purely a matter of taste and of how the colour fits into the surrounding planting.

In the wild and in gardens burning bush appears in two colour forms. The pink-flowering form (var. purpureus), with characteristic darker veins on the petals, is the one that grows wild here too. The other form, pure white (var. albus), came into gardens as a separately bred white-flowered cultivar. Both forms have the same growing requirements and differ only in flower colour.

Form	Flower colour	Occurrence
var. purpureus	pink with darker veining	wild in the Czech Republic too, common in gardens
var. albus	pure white	bred garden cultivar

Position, soil and planting

Burning bush wants a sunny to lightly partially shaded spot, similar to the light oak woods where it grows wild. It needs fertile, heavier soil that nevertheless drains excess water well; it does not tolerate waterlogging of the roots. Once it has established, it does not tolerate transplanting much, as it has a long taproot that is easily damaged when moved. Therefore choose the position carefully straight away for good.

Sowing and propagation

The most reliable is sowing fresh seeds, ideally immediately after harvesting them, because the seeds quickly lose viability and older ones germinate worse without the help of a cold period. After sowing it is usually necessary to wait for the first seedlings even through winter. Allow for the fact that from sowing to first flowering usually takes around four years; burning bush grows slowly and is an investment for the long term, not a plant for quick effect.

Sow the seeds into trays with well-drained substrate and leave them over winter outdoors or in a cold greenhouse; the cold period helps break their natural dormancy. Transplant seedlings carefully and as early as possible, while the root is still short and sensitive to damage, to minimise it. Dividing clumps does not work well with burning bush because of the deep taproot, which is easily damaged by division, so gardeners prefer sowing seeds to vegetative propagation.

Care and watering

Water young plants moderately but regularly until they root. A mature, established burning bush tolerates drought considerably better; overwatering harms it more than an occasional dry spell. Do not overdo the feeding; it is enough to add a little compost or balanced fertiliser for perennials once in spring.

After flowering you can leave the stems so that the seed capsules ripen, if you want to propagate the plant further. Otherwise it is enough in autumn or spring to remove only the dried parts; do not interfere with the plant needlessly, because after disturbance to the roots it recovers only slowly. In winter burning bush survives frost here without problems and needs no special protection, provided it grows in a position corresponding to its requirements.

Safety: phototoxic sap

The sap from the leaves and above all from the flowers and fruits of burning bush can in more sensitive people, after contact with the skin and subsequent exposure to sun, cause an allergic photosensitive reaction, which shows as redness and blisters and may even leave scars. It is a similar mechanism to that of giant hogweed, which is much better known here, but burning bush can also trigger a similar reaction, though on a smaller scale. When working with the plant, especially when cutting spent stems or harvesting seeds, use gloves and long sleeves, and if sap nevertheless gets on the skin, wash the spot and avoid direct sun for at least a few days.

The reaction usually does not appear immediately but only hours after exposure to the sun, so people do not always connect the work in the garden with the irritated skin. If blisters nevertheless appear, proceed as with an ordinary burn, cool and protect the spot from further sun, and in the case of a more extensive reaction seek a doctor.

Frequently asked questions

Why is burning bush called burning bush?

Because of the strong aromatic essential oils, whose vapours around the plant can be set alight on a hot windless day without the flame damaging it.

What is the difference between white and pink burning bush?

They are colour forms of the same species, Dictamnus albus. The pink form (var. purpureus) grows wild here too; the pure white (var. albus) is a bred garden cultivar. Their growing requirements are the same.

Why does burning bush take so long to flower?

It grows very slowly; from sowing to first flowering usually takes around four years. It is a normal characteristic of the species, not a mistake in growing.

Can burning bush be transplanted to another place in the garden?

Only with difficulty; it has a long taproot that is easily damaged when transplanting. It is better to choose the final position right at the start.

Is burning bush dangerous for children and pets?

The sap of the plant can, after contact with the skin and sun, cause a burn-like reaction, so keep children and animals away from freshly cut parts and wash your hands thoroughly after working with the plant, even if you wore gloves.

Sources

Updated: 10 October 2026