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 undemanding plants for the modern garden. This European native hails from the mountainous regions of southern Europe, where it has adapted over centuries to rocky outcrops and poor soils. This is the source of its remarkable resilience: deep, fleshy roots sustain the plant through drought, whilst dense, aromatic foliage provides a reliable defence against insects and pests.

Summer brings a truly festive moment: from May to June, the geranium is clothed in restrained flowers in shades ranging from pale pink to deep magenta, whilst white-petalled cultivars add freshness and simplicity to any composition. The plant is discreet, modest in size (merely 20–40 cm), yet functions as a genuine ground cover, densely colonising areas where others struggle. In well-drained soil, it thrives for decades without demanding fertiliser or other fussy care.

In the garden, Bigroot Geranium finds a place everywhere. It is sown beneath trees and shrubs, planted amongst stones on alpine rockeries, and used to edge pathways and borders. It is a peaceful neighbour, suppressing competitors through no aggressive root competition, and harmonises with any style—from naturalistic to minimalist. It has achieved particular popularity in Scandinavian gardens, where northern authenticity is most valued.

Yet the most practical fact: when foliage is crushed, it releases a persistent spicy aroma that cats and mosquitoes attempt to avoid. So if you need a plant that offers style, brings peace to your garden, and asks 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