The Botanical Diary
B
Flowers

Bigroot Geranium

Geranium macrorrhizum
Also known asgeranium, bigroot cranesbill

The foliage releases a strong aromatic scent when crushed, which deters cats and mosquitoes.

Regions
all regions
Colour
pink, crimson, white
Bigroot Geranium (geranium, bigroot cranesbill)
🌸
Bloom
May–June
☀️
Light
Partial shade / тінь
💧
Watering
Low
📏
Height
0,2–0,4 m
❄️
Hardiness
Zone 4а

Bigroot Geranium is one of the most uncomplicated plants for the modern garden. This European visitor originates from the mountain regions of Southern Europe, where it has spent centuries adapting to rocky outcrops and poor soils. This is precisely where such incredible resilience comes from: deep, fleshy roots sustain the plant through drought, whilst dense, aromatic foliage serves as nature's reliable shield against insects and pests.

Summer brings a truly festive moment: from May through June, the geranium blankets itself with understated flowers in shades ranging from pale pink to deep magenta, whilst white-petalled varieties add freshness and simplicity to any planting scheme. The plant is unassuming and modest in stature—barely 20–40 cm tall—yet works as a genuine ground cover, densely colonising areas where others might falter. In well-draining soil, it thrives for decades, demanding neither feeding nor fussy attention.

In the garden, Bigroot Geranium finds its place everywhere. It is sown beneath trees and shrubs, tucked between stones on alpine rockeries, used to edge pathways and borders. It is peaceable with neighbours, does not compete aggressively with roots, and harmonises with any style—from naturalistic to minimalist. It has gained particular popularity in Scandinavian gardens, where such understated, northern simplicity is most highly valued.

And here is the most practical fact: when leaves are rubbed, they release a persistent spicy aroma that cats and mosquitoes tend to avoid. So if you need a plant that offers style, protects your peace of mind, and asks for nothing in return—Bigroot Geranium is already waiting for you.

Location & soil

Bigroot Geranium — planting & location

LightPartial shade / тінь
Soil typeany, рН 6–7,5
Planting timeApril–May або August
Plant spacing0,25–0,4 m
Planting depth8–10 см

Excellent ground cover plant with aromatic foliage.

Water needs

How to water Bigroot Geranium

IntensityLow
FrequencyEvery 14 days (в)
Volume5–8
MethodAt the base

Drought-tolerant once established.

Annual care

Fertilizing and pruning: Bigroot Geranium

Spring fertilizingDo not fertilise (extremely low-maintenance).
Summer fertilizingDo not fertilise.
Autumn fertilizingDo not fertilise.
Pruning timeAfter flowering (легко стригти)
Pruning typeSanitary / формуюча

Remove spent flower heads and old foliage.

Cold hardiness

Bigroot Geranium — winter hardiness & care

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

Diseases and pests of Bigroot Geranium

Diseases
Гниль при надлишку вологи
Pests
Шкідники рідко
Garden design

What grows well with Bigroot Geranium?

Хоста, астільба, Catmint