Large-leaf Waterleaf (Hydrophyllum macrophyllum)

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Sunlight Partial shade to full shade; tolerates dappled woodland light, avoid direct midday sun

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Watering Keep soil consistently moist but not waterlogged; prefers well-drained, humus-rich substrate

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Temperature Hardy to USDA zone 3; tolerates cold winters and cool summer temperatures, avoid extreme heat above 30°C

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Leaf: Large, heart-shaped, softly hairy leaves with serrated margins, up to 20 cm wide
Flower: Clusters of bell-shaped, pale blue to lavender flowers with protruding stamens
Stem: Erect, hairy stems branching near the top to support flower clusters

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Watering

Keep soil evenly moist, mulch to retain moisture

Fertilization

Light feed once monthly. Use diluted, nitrogen-balanced organic feed to support foliage and flower growth

Composted leaf mold tea：Brew fully decomposed leaf mold in water for 24 hours; dilute 1:20 for root drench to enrich soil structure

Pruning

Remove spent flower stalks to encourage tidy growth and prevent self-seeding if desired
Thin overcrowded clumps in early spring to improve airflow and reduce disease risk
Trim yellowing foliage in late autumn to prepare for winter dormancy

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Warning: this plant may be toxic.

Pets & Humans

Pets: No known toxicity to cats per ASPCA records

Humans: No known toxicity to humans

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Culture: N/A

Usage: Woodland garden groundcover, native pollinator support for bees and butterflies