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Perennial · Lamiaceae family

Woolly hedgenettle

Stachys byzantina

Full sun to part shade 0.3–0.45 m × 0.3–0.45 m Flowers June–July to −32 °C
Flower colours Click a colour

In short a 10-second read

SunFull sun to part shade
Size0.3–0.45 m
spacing 33 cm
FlowersJune–July
PlantingApril–May
WinterNo winter protection

Where to plant and how much to water

Sun, soil and water.

It grows best in full sun to part shade, in dry to average soil.

Sun

Sun6 hours or more
Part shade3–6 hours
Shadeunder 3 h

Soil

tolerates any pH
acidicneutralalkaline
dry to averagenot fussy about soil

Watering

drought tolerant once establisheddo not waterlogless when it rains

Frost

−32 °C
no winter protectiongreen in winter too

How much space it takes

Mature size.

The mature plant next to a person (175 cm).

50 cm1 m1.5 m0.3–0.45 mspread 0.3–0.45 m
0.3–0.45 m× spread 0.3–0.45 m

Plant 33 cm apart.

Reaches maturity in about 2–5 years. The final size depends on the cultivar and the spot — we give the range from smallest to largest.

Calendar

Through the year.

Months for Central Europe. The line shows the current month.

The year at a glance

Flowers: JanuaryFlowers: FebruaryFlowers: MarchFlowers: AprilFlowers: MayFlowers: JuneFlowers: JulyFlowers: AugustFlowers: SeptemberFlowers: OctoberFlowers: NovemberFlowers: DecemberPlanting: JanuaryPlanting: FebruaryPlanting: MarchPlanting: AprilPlanting: MayPlanting: JunePlanting: JulyPlanting: AugustPlanting: SeptemberPlanting: OctoberPlanting: NovemberPlanting: DecemberFeeding: JanuaryFeeding: FebruaryFeeding: MarchFeeding: AprilFeeding: MayFeeding: JuneFeeding: JulyFeeding: AugustFeeding: SeptemberFeeding: OctoberFeeding: NovemberFeeding: DecemberJanFebMarAprMayJunJulAugSepOctNovDec
FlowersPlantingFeeding
Now, in October: nothing to do — the next job is in April.
JanFebMarAprMayJunJulAugSepOctNovDec

Flowers

JanFebMarAprMayJunJulAugSepOctNovDec

June–July · pink or purple

Planting

JanFebMarAprMayJunJulAugSepOctNovDec

container plant: April–May

Feeding

JanFebMarAprMayJunJulAugSepOctNovDec

March–May

Feeding

Nutrition.

Light
balanced fertilisercompost or mulch
JanFebMarAprMayJunJulAugSepOctNovDec

Pests and diseases

Common problems and what to do.

The most common problems in Central Europe. Protection is listed from the gentlest option.

What you will see

White powdery coating on leaves and stems.

When to look

From spring onwards

How to protect

  1. Prevention
    • Airy planting, enough space between plants.
    • Do not wet the leaves.
    • In autumn, remove fallen diseased leaves (reduces spores in spring).
  2. By hand as soon as the first symptoms appearRemove and destroy affected leaves; do not compost.
  3. Chemical — only when nothing else helps only after cultural measuresOnly minimal and targeted use; a product authorised in your country against powdery mildew.
Powdery mildewsdisease · from spring onwards

What you will see

White powdery coating on leaves and stems.

When to look

From spring onwards

How to protect

  1. Prevention
    • Airy planting, enough space between plants.
    • Do not wet the leaves.
    • In autumn, remove fallen diseased leaves (reduces spores in spring).
  2. By hand as soon as the first symptoms appearRemove and destroy affected leaves; do not compost.
  3. Chemical — only when nothing else helps only after cultural measuresOnly minimal and targeted use; a product authorised in your country against powdery mildew.
More about this problem

Stem, leaf and crown rot

disease

What you will see

Leaves and crown turn brown and rot in damp conditions.

How to protect

  1. Prevention
    • Free-draining soil; do not bury the crown.
    • Do not wet the leaves; airy planting.
  2. By hand once noticedRemove rotting leaves and stems.
Stem, leaf and crown rotdisease

What you will see

Leaves and crown turn brown and rot in damp conditions.

How to protect

  1. Prevention
    • Free-draining soil; do not bury the crown.
    • Do not wet the leaves; airy planting.
  2. By hand once noticedRemove rotting leaves and stems.
Sources (3)

Frequently asked

Quick answers.

When does woolly hedgenettle flower?

In June–July; the flowers are pink or purple.

Does woolly hedgenettle tolerate shade?

It tolerates part shade (3–6 hours of sun), but not full shade.

How much space does woolly hedgenettle need?

At maturity 0.3–0.45 m wide and 0.3–0.45 m tall; recommended spacing 33 cm.

Powdery mildews — what can you do?

Airy planting, enough space between plants. Remove and destroy affected leaves; do not compost.

Stem, leaf and crown rot — what can you do?

Free-draining soil; do not bury the crown. Remove rotting leaves and stems.

Sources (17) Checked 24 October 2026

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