ðŸŒą PropagateDirectory
Plants / Bigleaf Hydrangea

Bigleaf Hydrangea

Hydrangea macrophylla

Also known as: Mophead Hydrangea, French Hydrangea

⚠ïļ Toxic to petsHydrangeaceaeEasy to propagate

A complete guide to growing and propagating Bigleaf Hydrangea: its care needs, how to take cuttings and root them, how long propagation takes, and how to fix the most common problems.

Bigleaf Hydrangea care at a glance

☀ïļ Light
Part shade; morning sun with afternoon shade, especially in hot climates.
💧 Water
Keep consistently moist; large leaves wilt fast in dry soil and heat.
ðŸŠī Soil
Rich, moisture-retentive, well-draining soil; bloom color shifts with soil pH.
ðŸ’Ļ Humidity
Deciduous shrub hardy in zones 5-9.
ðŸū Toxicity
Toxic to cats, dogs, and horses (ASPCA); contains cyanogenic glycosides that can cause vomiting and lethargy.

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Log when you took each cutting, set rooting reminders, and watch your propagation timeline — free on iPhone.

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How to propagate Bigleaf Hydrangea

Softwood cuttings

Difficulty: EasyTimeline: Roots in 3-5 weeks; pot on and grow to planting size.
  1. Take a 4-6 inch tip cutting of non-flowering growth in early summer.
  2. Cut the leaves in half to reduce water loss and strip the lowest pair.
  3. Dip the base in rooting hormone and insert into moist cutting mix.
  4. Cover with a humidity dome and keep in bright, indirect light.
  5. Pot on once rooted, then plant out the following season.

Layering

Difficulty: Very easyTimeline: Roots in 8-12 weeks; sever and transplant next season.
  1. Bend a low branch to the ground and nick the underside.
  2. Pin it into a shallow trench and cover with soil, tip exposed.
  3. Keep the spot moist while roots develop.
  4. Sever from the parent and transplant once well rooted.

Common Bigleaf Hydrangea problems & fixes

Cuttings rot before they root

Too wet or no airflow. Use a free-draining mix, water sparingly, and vent the humidity cover daily.

Cuttings wilt after taking them

Normal at first — keep humidity high under a dome, out of direct sun, until roots form and perk them up.

Powdery mildew on leaves

Poor airflow and damp foliage. Space plants out, water at the base, and improve circulation.

Track your bigleaf hydrangea cuttings & propagation in SnipLog

Log when you took each cutting, set rooting reminders, and watch your propagation timeline — free on iPhone.

Get SnipLog →

Toxicity notes are a general guide based on ASPCA-style classifications — if a pet ingests any houseplant, contact your vet. Care needs vary with your home's conditions.