The Botanical Diary
B
Ornamental

Black Locust

Robinia pseudoacacia
Also known asblack locust, false acacia, robinia

One hectare of Black Locust yields up to 1 tonne of honey per season—Ukraine's most important honey plant.

Regions
all regions
Colour
White
Black Locust (black locust, false acacia, robinia)
🌸
Bloom
May–June
☀️
Light
Full sun
💧
Watering
Low
📏
Height
15–25 m
❄️
Hardiness
Zone 4а

Black Locust is a true queen among honey-producing trees, originating from the eastern regions of North America. In the early eighteenth century, European gardeners and beekeepers 'introduced' this enchantress across the Atlantic, and she now flourishes in gardens from Britain to Ukraine. With her simplicity and charm, she has won the hearts of gardeners worldwide—a tree that asks for practically nothing but a sunny location.

The tree first impresses with its appearance: delicate, feathery leaves give it an air of lightness, almost ethereal grace. In spring, as May arrives, the crowns burst forth with clusters of delicate white flowers bearing a subtle sweet fragrance. Varieties differ in character—some remain compact shrubs whilst others grow into true giants. There are also ornamental forms with golden foliage or weeping branches that add particular charm to the garden.

In the garden, Black Locust is a universal helper. It combines beautifully with hawthorn, wild rose and juniper, creating harmonious compositions. The plant is utterly undemanding: minimal watering, any soil from acidic to alkaline, no fertilising required—it is its own gardener, extracting nitrogen from the air through symbiosis with its roots.

But Black Locust's greatest talent is the gift of generosity. One hectare of this marvel yields up to one tonne of Ukraine's finest honey in a season. If you keep bees or simply wish to support pollinator populations, Black Locust is not merely a garden ornament, but truly a noble mission.

Location & soil

Black Locust — planting & location

LightFull sun
Soil typeany, рН 5,5–8
Planting timeOctober або April
Plant spacing5–7 m
Planting depthAt root collar level

Intensive honey plant, edible flowers, very vigorous grower.

Water needs

How to water Black Locust

IntensityLow
FrequencyНе потрібне (посухостійка)
Volume
Method

Annual care

Fertilizing and pruning: Black Locust

Spring fertilizingDo not fertilise (fixes nitrogen naturally).
Summer fertilizingDo not fertilise.
Autumn fertilizingDo not fertilise.
Pruning timeFebruary–March (sanitary)
Pruning typeSanitary

Remove only dead and diseased branches.

Cold hardiness

Black Locust — winter hardiness & care

Hardiness zoneZone 4а
Winter coverNot required.
Cover timing
Plant protection

Diseases and pests of Black Locust

Diseases
Bacterial canker
Pests
Акацієва вогнівка
Garden design

What grows well with Black Locust?

Juniper, глід, шипшина