PL. —Anemonopsis macrophyllaBotanical illustration — drop image
Anemonopsis macrophylla

False Anemone

SpringSummerFall
5a8aHardiness zone
Peak bloom windowZone 6b · frost-offset weeks
Winter
Not in bloom
Spring
Peak bloom
Summer
In bloom
Fall
Not in bloom
Peak bloom
In bloom
Background

Anemonopsis macrophylla is a Japanese woodland perennial — the only species in its genus — endemic to shaded mountain forests of Honshu. It produces nodding, waxy flowers in pale lilac-purple on arching stems through mid to late summer, a flowering window rare among deep-shade perennials. Its large, glossy, compound leaves add structure before and after flowering, making it useful in woodland gardens where mid-summer shade interest is scarce.

This plant demands cool, consistently moist, humus-rich soil at pH 5.5–6.5 and dislikes afternoon heat and dry spells. It is slow to establish but long-lived once settled, spreading gradually into tidy clumps. Seeds require cold stratification and may take two or more years to reach blooming size; division of established crowns in early spring is more reliable. Mulching with leaf mold conserves moisture and keeps roots cool through summer. It performs best at the northern end of its hardiness range and struggles where summers are hot and humid.

Care guide
SunPart shade to full shade
WaterConsistent moisture
SoilMoist, well-drained, humus-rich
Spacing18–24 in
Height18–30 in
Zone5a – 8a
Frost hardy
Seasonal tasks
winter
sowSurface-sow seeds in pots and cold-stratify outdoors or in a refrigerator for 6–8 weeks, then move to a cool cold frame to germinate. Expect slow, uneven germination.
spring
sowDivide established crowns just as new growth emerges. Lift carefully, separate into sections each with at least one growing point, replant promptly in humus-rich soil, and water in well.
watchInspect new foliage for slug and snail damage. Shaded, moist conditions favor mollusks; apply iron phosphate bait or set physical barriers early in the season.
summer
watchCheck soil moisture weekly during warm or dry spells. False anemone wilts quickly under drought; water deeply at the root zone and avoid wetting foliage.
watchLook for angular brown patches on leaves bounded by veins — a symptom of foliar nematode. Remove and bag affected leaves immediately; switch to drip or base watering to limit spread.
fall
cutCut all stems back to the base after frost kills the foliage. Remove plant debris from the bed to reduce overwintering sites for pests and pathogens.
Common problems

Foliar Nematode

Symptoms

Angular brown or black patches on leaves, bounded by leaf veins, starting on lower foliage and moving upward. Affected leaves wither but stay attached.

Treatment

Remove and destroy infected leaves and surrounding debris. Avoid overhead watering and wetting foliage. Space plants for airflow and do not compost affected material. Severely infested plants should be dug out and discarded.

Botrytis (grey mould)

Symptoms

Grey fuzzy mould on petals and stems, worst in cool wet conditions.

Treatment

Remove affected parts immediately. Improve air circulation. Avoid overhead watering. Apply copper fungicide if severe.

Crown Rot

Symptoms

Lower leaves yellow and wilt; the base of the rosette turns brown and soft, sometimes with white fungal threads at the soil line. Plants collapse in wet conditions.

Treatment

Remove and destroy affected plants. Improve drainage and avoid overhead watering. Do not mulch directly against the crown. Space plants for airflow and avoid replanting in the same wet spot.

Powdery mildew

Symptoms

White or grey powdery coating on leaves — usually starting on older growth in humid conditions or when nights cool.

Treatment

Improve air circulation by thinning plants. Apply neem oil or potassium bicarbonate spray at first sign. Avoid overhead watering.